ORIGINAL RESEARCH article
Front. Physiol.
Sec. Exercise Physiology
This article is part of the Research TopicPhysiological Aspects of Marathon Running, Volume IIView all 8 articles
Exploring Training-Sleep Characteristics and Bidirectional Lagged Relationships in Chinese Recreational Runners: Insights from a Year-Long Wearable Monitoring Study
Provisionally accepted
- Nanjing Sport Institute, Nanjing, China
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Objective: This study aims to explore training and sleep characteristics among recreational runners, along with their interrelationships, to provide more scientific and personalised training guidance. Methods: Recreational runners wearing Garmin smartwatches were recruited, and continuous data on training and sleep were collected via the device API from June 2024 to June 2025. Training data included pace, distance, duration, and heart rate, while sleep data included stage durations and nocturnal heart rate variability(HRV). Linear mixed models were applied to examine differences in training and sleep characteristics across sex, performance classification, season, and day of the week, and to explore the effects of training load on subsequent sleep and the influence of sleep duration on training performance on the following day. Results: The average distance per training session was 12.10±3.36 km, with an average pace of 6.02±1.00 min/km. Male runners exhibited significantly faster paces and longer distances than females, and elite runners outperformed other groups across all training parameters. Significant seasonal and weekly variations were observed. Specifically, pace was slowest and distance shortest in summer, while training volume, intensity, and heart rate were higher on rest days than on workdays. The average nightly sleep duration was 6.61 ± 0.69 h, indicating general insufficiency. Female runners had significantly longer deep sleep than males, and elite runners showed a more pronounced early sleep-wake rhythm. A bidirectional relationship was identified, with the finding that high training loads led to reductions in deep and REM sleep, increases in light sleep and wake duration, and lower HRV, collectively indicating impaired sleep quality and autonomic recovery despite longer total sleep duration. Conversely, insufficient sleep resulted in slower pace and decreased training efficiency on the following day, though runners tended to compensate by extending running duration. Conclusion: The training and sleep characteristics of recreational runners were significantly influenced by sex, performance classification, season, and weekday-weekend rhythm. A bidirectional association between training and sleep was observed, with high training loads and insufficient sleep posing potential risks to performance and recovery.
Keywords: recreational runners, Season, Sleep, training, wearable devices
Received: 22 Oct 2025; Accepted: 19 Jan 2026.
Copyright: © 2026 Xiaofeng, Lin, Xu, Gu, Chen and Dai. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Gangrui Chen
Jiansong Dai
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