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        <title>Frontiers in Physiology | Physio-logging section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/physiology/sections/physio-logging</link>
        <description>RSS Feed for Physio-logging section in the Frontiers in Physiology journal | New and Recent Articles</description>
        <language>en-us</language>
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        <pubDate>2026-04-09T21:59:43.469+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1675117</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1675117</link>
        <title><![CDATA[Editorial: Physio-logging in marine animals: recent advances and future directions]]></title>
        <pubdate>2025-08-28T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Kagari Aoki</author><author>J. Chris McKnight</author><author>Takashi Kitagawa</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1540252</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1540252</link>
        <title><![CDATA[Apparent reduction in heart rate during oviposition revealed by non-invasive heart rate monitoring of gravid loggerhead turtles]]></title>
        <pubdate>2025-07-02T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Tomoko Narazaki</author><author>Masanori Mori</author><author>Yoshimasa Matsuzawa</author><author>Ayaka Saito</author><author>Chihiro Kinoshita</author><author>Masanori Kurita</author><author>Kensuke Matsumiya</author><author>Hikari Okada</author><author>Kentaro Q. Sakamoto</author>
        <description><![CDATA[Reproductive processes place significant physiological demands on animals, often accompanied by hormonal and neural changes. In this study, we examined changes in heart rate of gravid loggerhead turtles (Caretta caretta) during nesting activities on the beach, especially during egg-laying phase. To examine heart rate throughout the nesting activities, non-invasive electrocardiogram (ECG) loggers and accelerometers were deployed on five gravid females. Heart rate increased markedly upon beach landing and remained elevated during most nesting phases. However, a significant decrease in heart rate, often accompanied by increased RMSSD, was observed during egg-laying, suggesting parasympathetic nervous system dominance during this phase. This pattern is similar to observation reported in other species (e.g., horses and chum salmon), where bradycardia during reproductive events is associated with elevated parasympathetic tone. Our study reported an apparent reduction in heart rate during oviposition, which reflects the physiological mechanisms underlying nesting activities in sea turtles, and suggest that external stressors disrupting parasympathetic activity may reduce egg-laying success.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1639428</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1639428</link>
        <title><![CDATA[Editorial: Physio-logging in humans: recent advances and limitations in wearable devices for biomedical applications]]></title>
        <pubdate>2025-06-25T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Céderick Landry</author><author>Mohammad Yavarimanesh</author><author>Colin K. Drummond</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1511476</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1511476</link>
        <title><![CDATA[Novel insights into sex-specific differences in heart rate variability and autonomic nervous system regulation during spawning behavior in chum salmon (Oncorhynchus keta) revealed by re-analysis of ECG logger data]]></title>
        <pubdate>2025-05-29T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yuya Makiguchi</author><author>Takaaki K. Abe</author><author>Masaki Ichimura</author>
        <description><![CDATA[This study reanalysed electrocardiogram (ECG) data collected in a previous study on chum salmon to explore sex-specific differences in heart rate variability (HRV) and autonomic nervous system regulation during spawning. The prior research included six female and five male salmon with implanted ECG loggers, observed during spawning, and ten additional females for pharmacological experiments on autonomic nervous system effects. The analysis uncovered distinct HRV patterns between sexes. Females exhibited an increase in heart rate from 82.27 to 86.16 bpm post-spawning, while males decreased from 74.71 to 67.78 bpm. Breakpoint analysis identified four change points in female HRV and five in male HRV. Females displayed a heart rate decrease 21 min before spawning, while males maintained stable rates until spawning. Both sexes experienced cardiac arrest at spawning, consistent with the previous study. HRV changes did not always correspond directly with spawning behaviors, indicating autonomic nervous system involvement beyond physical exertion. Pharmacological experiments showed that atropine, a parasympathetic blocker, suppressed HRV and prevented cardiac arrest, emphasizing the key role of the parasympathetic system in regulating spawning-related HRV. The study suggests that HRV during salmon spawning is regulated by physical activity and autonomic nervous system control, with an important role in parasympathetic activation. This activation begins 20 min before spawning in females, serving as a preparatory mechanism for the physiological demands of spawning. These findings improve our understanding of salmonid reproductive physiology and may inform conservation strategies. Future research should investigate direct measurements of autonomic activity, environmental influences on HRV, and the relationship between HRV patterns and reproductive success. Combining HRV data with other physiological measurements could offer a more comprehensive understanding of the regulatory mechanisms underlying spawning behavior and the energetic costs associated with reproduction in salmonids.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1512043</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1512043</link>
        <title><![CDATA[Juvenile-specific high heat production contributes to the initial step of endothermic development in Pacific bluefin tuna]]></title>
        <pubdate>2025-05-29T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Takaaki K. Abe</author><author>Maho Fuke</author><author>Ko Fujioka</author><author>Takuji Noda</author><author>Hiroyuki Irino</author><author>Yoshikazu Kitadani</author><author>Hiromu Fukuda</author><author>Morten Bo Søndergaard Svendsen</author><author>John Fleng Steffensen</author><author>Takashi Kitagawa</author>
        <description><![CDATA[Pacific bluefin tuna (Thynnus orientalis; PBT) can maintain their body temperature above ambient water (i.e., thermal excess) through high heat production and heat retention. The endothermic ability develops at 20–40 cm fork length (Lf), which has been attributed to improved heat retention. Meanwhile, the contribution of heat-production capacity to the development of thermal excess is insufficiently understood. This study aimed to elucidate the ontogenetic pattern of heat production and its contribution to endothermic capacity in juvenile PBT using a heat-budget model (HBM) and swim-tunnel respirometry. The HBM was applied to 2–4 months of biologging data from juveniles (23–50 cm Lf; 200–4 kg) to estimate heat production rates (T˙m), revealing that these rates remained high up to approximately 700 g and declined thereafter. Moreover, the comparison of the development of endothermic capacity with the HBM-estimated parameters suggests that in the early juvenile stages, when PBT rapidly develop the thermal excess, the high T˙m contributes to the thermal excess. The high T˙m in this stage implied the juvenile-specific development of aerobic capacity; therefore, metabolic rate and aerobic capacity-related tissues (red muscle and ventricle) were measured, and the scaling exponents were calculated in this stage (16–28 cm Lf; 50–420 g). Swim-tunnel respirometry was conducted on juvenile PBT in Japan (August–September 2022 and 2023), and the collected samples were used to measure red muscle and ventricular masses. The scaling exponents of tunas throughout life history are generally in the range of 0.6–0.9, while those for these traits were 1.0 or greater in this size range, supporting the juvenile-specific aerobic capacity development. In conclusion, this study reveals the ontogenetic characteristics of heat production-related traits in PBT and provides new insights into the developmental process of endothermic ability, beyond heat retention capacity.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1509511</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1509511</link>
        <title><![CDATA[Species-specific physiological status in seabirds: insights from integrating oxidative stress measurements and biologging]]></title>
        <pubdate>2025-03-19T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Shiho Koyama</author><author>Yuichi Mizutani</author><author>Yusuke Goto</author><author>Ken Yoda</author>
        <description><![CDATA[Understanding the relationship between behavior and physiological state, as well as species differences in physiological responses, is key to identifying the behavioral and physiological adaptations necessary for wild animals to avoid physiological deterioration, thereby enhancing their survival and fitness. A commonly used measure of physiological condition is oxidative stress, which results from an imbalance between oxidative damage—often exacerbated by respiration during exercise and indicative of physical harm—and antioxidant capacity, which reflects the organism’s ability to recover from such damage. Despite its importance, oxidative stress has rarely been linked to behavior, such as foraging, leaving this relationship underexplored. In this study, we focused on two seabird species, black-tailed gulls (Larus crassirostris) and streaked shearwaters (Calonectris leucomelas), which are similar in body size and primarily forage on the same prey species but differ in traits such as habitat, flight style, and physiological function. We recorded the trajectories of these birds for approximately 1 week using biologging and measured their plasma oxidative stress. We found that oxidative stress in black-tailed gulls was higher than that in streaked shearwaters, suggesting that species differences in life histories, habitats, and physiological function may be related to long-term oxidative stress. However, over a 1-week timescale, there were no significant species differences in changes in oxidative stress, suggesting that behavioral differences between the two species might not necessarily lead to species-specific oxidative stress responses in the short term. Additionally, no consistent relationship was found between changes in oxidative stress of the two species and their behavioral metrics in most years, suggesting that this relationship may vary depending on yearly environmental fluctuations. Based on our findings, we encourage future studies that would explore and integrate the interactions between marine environments, behavior, and oxidative stress of different bird species to clarify the contribution of specific foraging behaviors to either the deterioration or recovery of physiological conditions, and the varying effect of environmental conditions on these relationships.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1480018</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1480018</link>
        <title><![CDATA[Distress detection in VR environment using Empatica E4 wristband and Bittium Faros 360]]></title>
        <pubdate>2025-03-05T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Jelena Medarević</author><author>Nadica Miljković</author><author>Kristina Stojmenova Pečečnik</author><author>Jaka Sodnik</author>
        <description><![CDATA[IntroductionDistress detection in virtual reality systems offers a wealth of opportunities to improve user experiences and enhance therapeutic practices by catering to individual physiological and emotional states.MethodsThis study evaluates the performance of two wearable devices, the Empatica E4 wristband and the Faros 360, in detecting distress in a motion-controlled interactive virtual reality environment. Subjects were exposed to a baseline measurement and two VR scenes, one non-interactive and one interactive, involving problem-solving and distractors. Heart rate measurements from both devices, including mean heart rate, root mean square of successive differences, and subject-specific thresholds, were utilized to explore distress intensity and frequency.ResultsBoth the Faros and E4 sensors adequately captured physiological signals, with Faros demonstrating a higher signal-to-noise ratio and consistency. While correlation coefficients were moderately positive between Faros and E4 data, indicating a linear relationship, small mean absolute error and root mean square error values suggested good agreement in measuring heart rate. Analysis of distress occurrence during the interactive scene revealed that both devices detect more high- and medium-level distress occurrences compared to the non-interactive scene.DiscussionDevice-specific factors in distress detection were emphasized due to differences in detected distress events between devices.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1491401</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1491401</link>
        <title><![CDATA[Laboratory comparison of consumer-grade and research-established wearables for monitoring heart rate, body temperature, and physical acitivity in sub-Saharan Africa]]></title>
        <pubdate>2025-02-13T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Stefan Mendt</author><author>Georgi Zout</author><author>Marco Rabuffetti</author><author>Hanns-Christian Gunga</author><author>Aditi Bunker</author><author>Sandra Barteit</author><author>Martina Anna Maggioni</author>
        <description><![CDATA[BackgroundConsumer-grade wearables are becoming increasingly popular in research and in clinical contexts. These technologies hold significant promise for advancing digital medicine, particularly in remote and rural areas in low-income settings like sub-Saharan Africa, where climate change is exacerbating health risks. This study evaluates the data agreement between consumer-grade and research-established devices under standardized conditions.MethodsTwenty-two participants (11 women, 11 men) performed a structured protocol, consisting of six different activity phases (sitting, standing, and the first four stages of the classic Bruce treadmill test). We collected heart rate, (core) body temperature, step count, and energy expenditure. Each variable was simultaneously tracked by consumer-grade and established research-grade devices to evaluate the validity of the consumer-grade devices. We statistically compared the data agreement using Pearson’s correlation r, Lin’s concordance correlation coefficient (LCCC), Bland-Altman method, and mean absolute percentage error.ResultsA good agreement was found between the wrist-worn Withings Pulse HR (consumer-grade) and the chest-worn Faros Bittium 180 in measuring heart rate while sitting, standing, and slow walking on a treadmill at a speed of 2.7 km/h (r ≥ 0.82, |bias| ≤ 3.1 bpm), but this decreased with increasing speed (r ≤ 0.33, |bias| ≤ 11.7 bpm). The agreement between the Withing device and the research-established device worn on the wrist (GENEActiv) for measuring the number of steps also decreased during the treadmill phases (first stage: r = 0.48, bias = 0.6 steps/min; fourth stage: r = 0.48, bias = 17.3 steps/min). Energy expenditure agreement between the Withings device and the indirect calorimetry method was poor during the treadmill test (|r| ≤ 0.29, |bias | ≥ 1.7 MET). The Tucky thermometer under the armpit (consumer-grade) and the Tcore sensor on the forehead were found to be in poor agreement in measuring (core) body temperature during resting phases (r ≤ 0.53, |bias| ≥ 0.8°C) and deteriorated during the treadmill test.ConclusionThe Withings device showed adequate performance for heart rate at low activity levels and step count at higher activity levels, but had limited overall accuracy. The Tucky device showed poor agreement with the Tcore in all six different activity phases. The limited accuracy of consumer-grade devices suggests caution in their use for rigorous research, but points to their potential utility in capture general physiological trends in long-term field monitoring or population-health surveillance.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1462940</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1462940</link>
        <title><![CDATA[Surfacing and diving behavior associated with thermal physiology in oceanic habitats of skipjack tuna (Katsuwonus pelamis) in the western north Pacific Ocean]]></title>
        <pubdate>2025-01-31T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yoshinori Aoki</author><author>Takashi Kitagawa</author><author>Hidetada Kiyofuji</author>
        <description><![CDATA[IntroductionThermal physiology is a pivotal biotic factor for the ecophysiology of commercially valuable tuna, influencing not only horizontal but also vertical behaviors. We aimed to examine how the thermal physiology of skipjack tuna (Katsuwonus pelamis, SKJ) can explain the differences in their vertical behavior, focusing on surfacing and diving, among various thermal environments during their northward migration in the western North Pacific.MethodsWe analyzed archival tag data collected during 2012–2015, with individual time series (Fork length: 38–49 cm, N = 38) of swimming depth, water temperature, and peritoneal body temperature during northward migration from subtropical areas to temperate regions around Japan. We quantified surfacing and diving behavior as an index of vertical behavior and estimated the whole-body heat transfer coefficient (λ) during the cooling and warming phases associated with diving using body and water temperature records as indicators of thermal physiology.ResultsIn the southern mixed layer areas, SKJ were widely distributed at a depth layer <200 m, whereas they were restricted to the surface in the strong thermocline areas in the north. The dive duration was significantly shortened with a strong thermal gradient during northward migration. We observed minor to no differences in λ values between the cooling and warming phases in the southern areas, whereas the λ values in temperate areas differed by a factor of 2–3 between the phases.DiscussionOur findings of changes in λ values between the cooling and warming phases represent the first evidence of thermoregulation in SKJ. Surfacing preference behavior and short dive duration in temperate areas may be an avoidance of prolonged exposure to cold temperatures, a behavior commonly exhibited in other tuna. Moreover, we discussed how the changes in vertical behavior driven by thermal physiology can explain spatial heterogeneity in SKJ fishery grounds in the western Pacific Ocean.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2025.1519701</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2025.1519701</link>
        <title><![CDATA[Effects of nest locations on foraging behavior and physiological responses in seabird colony]]></title>
        <pubdate>2025-01-31T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yuichi Mizutani</author><author>Yusuke Goto</author><author>Akiko Shoji</author><author>Ken Yoda</author>
        <description><![CDATA[Breeding success and survival in colonial seabirds are influenced by nest location, physical surroundings, and external disturbances. Nest location may also directly or indirectly affect individual foraging behavior and physiological conditions, shaping reproductive success and survival. Despite these influences, few studies have integrated the analysis of nest location, behavior, and physiological status. In this study, we analyzed 20 black-tailed gulls (Larus crassirostris) nesting in the center of a colony within a protected area (Central Group, CG) and five gulls on the periphery outside the protected area, where human disturbance is frequent (Peripheral Group, PG). Using GPS movement trajectories and physiological indicators, we found that although clutch sizes were similar between the CG and PG, the PG exhibited shorter foraging trip durations, maximum distances from the nest, and a lower daily frequency of foraging trips. Antioxidant capacity did not differ between the groups; however, oxidation levels were lower in the PG. These behavioral and physiological differences associated with nest location may partly result from the incubation period influenced by human activity. The PG individuals remained in the peripheral group for at least 2 years (some for over 15 years), with all reproductive attempts failing, suggesting consistently low reproductive success. However, reduced foraging activity and lower oxidative stress levels reflect an energy-saving strategy that may mitigate the costs of repeated breeding failures. These findings suggest a potential life-history trade-off, in which individuals prioritize survival over reproductive success. This highlights how external disturbances and nest location can shape energy allocation strategies within a colony’s peripheral-central distribution.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2024.1511443</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2024.1511443</link>
        <title><![CDATA[Development of a non-invasive heart rate measurement method for sea turtles with dense keratinous scutes through effective electrode placement]]></title>
        <pubdate>2025-01-14T00:00:00Z</pubdate>
        <category>Methods</category>
        <author>Ayaka Saito</author><author>Kino Sakai</author><author>Megumi Kawai</author><author>Lyu Lyu</author><author>Kazunari Kameda</author><author>Hiromi Kudo</author><author>Katsufumi Sato</author><author>Kentaro Q. Sakamoto</author>
        <description><![CDATA[Measuring the heart rate of sea turtles is important for understanding their physiological adaptations to the environment. Non-invasive methods to measure the electrocardiogram (ECG) of sea turtles have been developed by attaching electrodes to their carapace. However, this method has only been applicable to sea turtles with sparse keratin on their shell surfaces, such as loggerhead turtles, and it is difficult to detect heartbeats in sea turtles with dense keratinous scutes, including green sea turtles. Here, we explored the electrode placements on the plastron that can be applied to ECG measurement in green turtles. ECG signals were checked using a handheld ECG monitor at three sets of electrode placement on the plastron. When ECG signals could be detected, they were measured in the water tanks for several days to confirm the clarity of the ECG signals. Of the 29 green turtles, when the negative electrode was placed near the neck area of the plastron, clear ECG signals were obtained in nine individuals (39.1%), whereas ECG signals were not detected at any placements in four individuals (17.4%). Furthermore, in the water tank experiments, continuous ECG signals were successfully recorded by attaching a negative electrode near the neck: almost noiseless clear ECG signals even during moving in seven out of ten individuals and slightly weak and noisy signals in other individuals. The measured heart rate of ten individuals during resting was 8.6 ± 2.9 (means ± s.d.) beats min−1 and that during moving was 12.2 ± 4.7 beats min−1, similar to those reported in a previous study involving the insertion of electrodes inside the body. Therefore, for measuring the ECG of green turtles, the negative electrode should be placed closer to the neck, and the positive and earth electrodes should be placed to the lower left of the plastron. Although the selection of suitable individuals for measurements is required, this heart rate measurement method will contribute to a better understanding of the physiological status of sea turtles with dense keratinous scutes, including green turtles.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2024.1498399</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2024.1498399</link>
        <title><![CDATA[Toward a hyperventilation detection system in freediving: a proof of concept using force sensor technology]]></title>
        <pubdate>2025-01-06T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Frank Pernett</author><author>Eric Mulder</author><author>Filip Johansson</author><author>Arne Sieber</author><author>Ricardo Bermudez</author><author>Marcus Lossner</author><author>Erika Schagatay</author>
        <description><![CDATA[Background and aimHyperventilation before breath-hold diving (freediving) is widely accepted as a risk factor for hypoxic syncope or blackout (BO), but there is no practical way to address it before dives. This study explores the feasibility of using a force sensor to predict end-tidal carbon dioxide (PETCO2) to assess hyperventilation in freedivers.Methods and resultsTwenty-one freedivers volunteered to participate during two national competitions. The divers were instructed to breathe normally and perform three dry apneas of 1, 2, and 3-min duration at 2-min intervals in a sitting position. Before and after the apneas, PETCO2 was recorded. The signal from the force sensor, attached to a chest belt, was used to record the frequency and amplitude of the chest movements, and the product of these values in the 60 s before the apnea was used to predict PETCO2. The mean PETCO2 was below 35 mmHg before all apneas. The mean amplitude of the signal from the force sensor increased from apnea 1 to apnea 3 (p < 0.001), while the respiratory rate was similar (NS). The product of the respiratory rate and amplitude from the force sensor explained 34% of the variability of the PETCO2 in the third apnea.ConclusionThis study shows that a force sensor can estimate hyperventilation before static apnea, providing a basis for further research. More studies are needed to confirm its effectiveness in preventing issues. Freedivers may hyperventilate without noticing it, and such a system could improve awareness of this condition. Additional underwater tests are essential to determine whether this system can enhance safety in freediving.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2024.1499058</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2024.1499058</link>
        <title><![CDATA[Mapping spatial memory in teleosts: a new Frontier in neural logging techniques]]></title>
        <pubdate>2024-11-06T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Susumu Takahashi</author><author>Fumiya Sawatani</author><author>Kaoru Ide</author><author>Takaaki K. Abe</author><author>Takashi Kitagawa</author><author>Yuya Makiguchi</author>
        <description><![CDATA[Recent advancements in microelectromechanical system technology have significantly enhanced our ability to monitor neuronal activity in free-swimming fish without disrupting their natural movement, thereby greatly improving the capabilities of neural logging using “neurologger” technology. In this review, we compiled the findings from studies applying neurologgers to teleost fish, emphasizing the discovery of various spatial-cognition cells in regions of the telencephalon analogous to the mammalian hippocampus that are deeply involved in spatial navigation. We detailed how different fish species, such as goldfish and salmonids, correlate their neural activity with environmental boundaries, head direction, speed, and other navigational cues for spatial memory and navigation strategies. We critically analyzed the similarities and differences in these mechanisms to provide insights into the evolutionary aspects of spatial cognition. We also identified gaps in current methodologies and suggest directions for future research, emphasizing the need for further exploration of spatial encoding in aquatic environments. The insights gained herein suggest the existence of a complex and evolutionarily conserved substrate for navigation and memory in vertebrates, highlighting the potential of neurologgers to expand our understanding of spatial cognition.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2024.1344221</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2024.1344221</link>
        <title><![CDATA[Through the wall human heart beat detection using single channel CW radar]]></title>
        <pubdate>2024-01-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Sourav Kumar Pramanik</author><author>Shekh Md Mahmudul Islam</author>
        <description><![CDATA[Single-channel continuous wave (CW) radar is widely used and has gained popularity due to its simple architecture despite its inability to measure the range and angular location of the target. Its popularity arises in the industry due to the simplicity of the required components, the low demands on the sampling rate, and their low costs. Through-the-wall life signs detection using microwave Doppler Radar is an active area of research and investigation. Most of the work in the literature focused on utilizing multi-channel frequency modulated continuous wave (FMCW), CW, and ultra-wideband (UWB) radar for their capability of range and direction of arrival (DOA) estimation. In this paper, through-the-wall single-subject and two-subject concurrent heart rate detection using single-channel 24-GHz CW radar leveraged with maximal overlap discrete wavelet transform (MODWT) is proposed. Experimental results demonstrated that the repetitive measurement of seven different subjects at a distance of 20 cm up to 100 cm through two different barriers (wood and brick wall) showed an average accuracy of heart rate extraction of 95.27% for varied distances (20–100 cm) in comparison with the Biopac ECG acquisition signal. Additionally, the MODWT method can also isolate the independent heartbeat waveforms from the two subjects’ concurrent measurements through the wall. This involved four trials with eight different subjects, achieving an accuracy of 97.04% for a fixed distance of 40 cm from the Radar without estimating the angular location of the subjects. Notably, it also superseded the performance of the direct FFT method for the single subject after 40 cm distance measurements. The proposed simpler architecture of single-channel CW radar leveraged with MODWT has several potential applications, including post-disaster search and rescue scenarios for finding the trapped, injured people under the debris, emergency evacuation, security, surveillance, and patient vital signs monitoring.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1293752</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1293752</link>
        <title><![CDATA[Skin temperature influence on transcutaneous carbon dioxide (CO2) conductivity and skin blood flow in healthy human subjects at the arm and wrist]]></title>
        <pubdate>2024-01-23T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Emmanuel Dervieux</author><author>François Guerrero</author><author>Wilfried Uhring</author><author>Marie-Agnès Giroux-Metgès</author><author>Michaël Théron</author>
        <description><![CDATA[Objective: present transcutaneous carbon dioxide (CO2)—tcpCO2—monitors suffer from limitations which hamper their widespread use, and call for a new tcpCO2 measurement technique. However, the progress in this area is hindered by the lack of knowledge in transcutaneous CO2 diffusion. To address this knowledge gap, this study focuses on investigating the influence of skin temperature on two key skin properties: CO2 permeability and skin blood flow.Methods: a monocentric prospective exploratory study including 40 healthy adults was undertaken. Each subject experienced a 90 min visit split into five 18 min sessions at different skin temperatures—Non-Heated (NH), 35, 38, 41, and 44°C. At each temperature, custom sensors measured transcutaneous CO2 conductivity and exhalation rate at the arm and wrist, while Laser Doppler Flowmetry (LDF) assessed skin blood flow at the arm.Results: the three studied metrics sharply increased with rising skin temperature. Mean values increased from the NH situation up to 44°C from 4.03 up to 8.88 and from 2.94 up to 8.11 m·s−1 for skin conductivity, and from 80.4 up to 177.5 and from 58.7 up to 162.3 cm3·m−2·h−1 for exhalation rate at the arm and wrist, respectively. Likewise, skin blood flow increased elevenfold for the same temperature increase. Of note, all metrics already augmented significantly in the 35–38°C skin temperature range, which may be reached without active heating—i.e. only using a warm clothing.Conclusion: these results are extremely encouraging for the development of next-generation tcpCO2 sensors. Indeed, the moderate increase (× 2) in skin conductivity from NH to 44°C tends to indicate that heating the skin is not critical from a response time point of view, i.e. little to no skin heating would only result in a doubled sensor response time in the worst case, compared to a maximal heating at 44°C. Crucially, a skin temperature within the 35–38°C range already sharply increases the skin blood flow, suggesting that tcpCO2 correlates well with the arterial paCO2 even at such low skin temperatures. These two conclusions further strengthen the viability of non-heated tcpCO2 sensors, thereby paving the way for the development of wearable transcutaneous capnometers.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1213075</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1213075</link>
        <title><![CDATA[Predictors of sustained physical activity: behaviour, bodily health, and the living environment]]></title>
        <pubdate>2024-01-08T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Delia Elena Diaconașu</author><author>Iulian Stoleriu</author><author>Ioana Andreea Câmpanu</author><author>Ana-Maria Andrei</author><author>Ștefan Boncu</author><author>Cezar Honceriu</author><author>Veronica Mocanu</author><author>Georgiana Juravle</author>
        <description><![CDATA[This study examined the determinants of sustained physical activity. Eighty-four participants undertook a 7-weeks walking regime (i.e., a 1-h biometrically-monitored walk, at least 5 days/week), with bioelectrical impedance (BIA) and total cholesterol capillary blood measurements performed before and after programme. To investigate behavioural habit formation, 7 weeks after walking termination, all participants were interviewed and (health) re-tested. Data were modelled with an artificial neural network (ANN) cascading algorithm. Our results highlight the successful prediction of continued physical activity by considering one’s physical fitness state, the environmental living context, and risk for cardiovascular disease. Importantly, those artificial neural network models also taking body mass index (BMI) and blood cholesterol as predictors excel at predicting walking continuation (i.e., predictions with 93% predictability). These results are first to highlight the type and importance of available physiological drivers in maintaining a sustained physical activity regime such as walking. They are discussed within the framework of habit formation and the nowadays health and/or wellbeing focus.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1248893</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1248893</link>
        <title><![CDATA[Rethinking pain communication of patients with Alzheimer’s disease through E-textile interaction design]]></title>
        <pubdate>2023-11-27T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yanheng Li</author><author>Long Bai</author><author>Yaxuan Mao</author><author>Hongliang Ren</author><author>Yu Qiao</author><author>Xin Tong</author><author>Ray Lc</author>
        <description><![CDATA[Older individuals are easily prone to chronic pain. Due to the complexity of chronic pain, most elderly often have difficulty expressing pain to others to seek assistance, especially those with Alzheimer’s disease (AD). The caregivers cannot instantly discover the patients’ pain condition and provide timely pain management. This project applies physiological signal sensing technology to help AD patients express the presence of pain non-verbally. We embed sensors on patients’ handkerchiefs to identify the patient’s abnormal physical activity when pain occurs. Next, we translate the physiological signal into qualitative light alert to send to caregivers and indicate the pain occurrence condition. Then, utilizing multi-sensory stimulation intervention, we create an electronic textile (e-textile) tool to help caregivers effectively support patients in pain. And thus to create a two-way pain communication between caregivers and the patients. Pain perception can be independent of subjective expressions and tangibly perceived by others through our textile prototype. The e-textile handkerchiefs also bring up a new guide to facilitate communication for caregivers when their patients. We contribute the design insights of building a bio-sensing and e-textile system with considering the pain communication needs, patients’ pain behaviors and preference of objects. Our e-textile system may contribute to pain communication bio-sensing tool design for special elderly groups, especially those with weakened cognition and communication abilities. We provide a new approach to dealing with the pain of AD patients for healthcare professionals.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1281426</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1281426</link>
        <title><![CDATA[Editorial: Robust, reliable, and continuous assessment in health: the challenge of wearable and remote technologies]]></title>
        <pubdate>2023-09-12T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Jordi Aguiló</author><author>Driss Moussaoui</author><author>Ki Chon</author><author>Raquel Bailón</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1189732</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1189732</link>
        <title><![CDATA[Wrist ballistocardiography and invasively recorded blood pressure in healthy volunteers during reclining bike exercise]]></title>
        <pubdate>2023-05-12T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Torjus L. Steffensen</author><author>Filip E. Schjerven</author><author>Hans M. Flade</author><author>Idar Kirkeby-Garstad</author><author>Emma Ingeström</author><author>Fredrik S. Solberg</author><author>Martin Steinert</author>
        <description><![CDATA[Objective: Ballistocardiogram (BCG) features are of interest in wearable cardiovascular monitoring of cardiac performance. We assess feasibility of wrist acceleration BCG during exercise for estimating pulse transit time (PTT), enabling broader cardiovascular response studies during acute exercise and improved monitoring in individuals at risk for cardiovascular disease (CVD). We also examine the relationship between PTT, blood pressure (BP), and stroke volume (SV) during exercise and posture interventions.Methods: 25 participants underwent a bike exercise protocol with four incremental workloads (0 W, 50 W, 100 W, and 150 W) in supine and semirecumbent postures. BCG, invasive radial artery BP, tonometry, photoplethysmography (PPG) and echocardiography were recorded. Ensemble averages of BCG signals determined aortic valve opening (AVO) timings, combined with peripheral pulse wave arrival times to calculate PTT. We tested for significance using Wilcoxon signed-rank test.Results: BCG was successfully recorded at the wrist during exercise. PTT exhibited a moderate negative correlation with systolic BP (ρSup = −0.65, ρSR = −0.57, ρAll = −0.54). PTT differences between supine and semirecumbent conditions were significant at 0 W and 50 W (p < 0.001), less at 100 W (p = 0.0135) and 150 W (p = 0.031). SBP and DBP were lower in semirecumbent posture (p < 0.01), while HR was slightly higher. Echocardiography confirmed association of BCG features with AVO and indicated a positive relationship between BCG amplitude and SV (ρ = 0.74).Significance: Wrist BCG may allow convenient PTT and possibly SV tracking during exercise, enabling studies of cardiovascular response to acute exercise and convenient monitoring of cardiovascular performance.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphys.2023.1147260</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphys.2023.1147260</link>
        <title><![CDATA[Assessing effectiveness of heart rate variability biofeedback to mitigate mental health symptoms: a pilot study]]></title>
        <pubdate>2023-05-10T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Thais Castro Ribeiro</author><author>Pau Sobregrau Sangrà</author><author>Esther García Pagès</author><author>Llorenç Badiella</author><author>Beatriz López-Barbeito</author><author>Sira Aguiló</author><author>Jordi Aguiló</author>
        <description><![CDATA[Introduction: The increasing burden on mental health has become a worldwide concern especially due to its substantial negative social and economic impact. The implementation of prevention actions and psychological interventions is crucial to mitigate these consequences, and evidence supporting its effectiveness would facilitate a more assertive response. Heart rate variability biofeedback (HRV-BF) has been proposed as a potential intervention to improve mental wellbeing through mechanisms in autonomic functioning. The aim of this study is to propose and evaluate the validity of an objective procedure to assess the effectiveness of a HRV-BF protocol in mitigating mental health symptoms in a sample of frontline HCWs (healthcare workers) who worked in the COVID-19 pandemic.Methods: A prospective experimental study applying a HRV-BF protocol was conducted with 21 frontline healthcare workers in 5 weekly sessions. For PRE–POST intervention comparisons, two different approaches were used to evaluate mental health status: applying (a) gold-standard psychometric questionnaires and (b) electrophysiological multiparametric models for chronic and acute stress assessment.Results: After HRV-BF intervention, psychometric questionnaires showed a reduction in mental health symptoms and stress perception. The electrophysiological multiparametric also showed a reduction in chronic stress levels, while the acute stress levels were similar in PRE and POST conditions. A significant reduction in respiratory rate and an increase in some heart rate variability parameters, such as SDNN, LFn, and LF/HF ratio, were also observed after intervention.Conclusion: Our findings suggest that a 5-session HRV-BF protocol is an effective intervention for reducing stress and other mental health symptoms among frontline HCWs who worked during the COVID-19 pandemic. The electrophysiological multiparametric models provide relevant information about the current mental health state, being useful for objectively evaluating the effectiveness of stress-reducing interventions. Further research could replicate the proposed procedure to confirm its feasibility for different samples and specific interventions.]]></description>
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