ORIGINAL RESEARCH article
Front. Physiol.
Sec. Exercise Physiology
Volume 16 - 2025 | doi: 10.3389/fphys.2025.1700462
Aerobic training improves exercise capacity after traumatic brain injury in female, but not male, mice
Provisionally accepted
Kate Karelina*
Deborah Corbin
Claymore T GumboTaylor PayneEmma RegerJayden BarrMikayla OldhamBrett Shoemaker
Sakthijothi MuthuEthan Meadows
John Hollander
Zachary M Weil- West Virginia University, Morgantown, United States
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Abstract Traumatic brain injury (TBI) often leads to lasting impairments in physical performance, yet its impact on aerobic function and the potential for recovery through exercise remain poorly understood. In this study, we used a well-established controlled cortical impact (CCI) model in mice to address three gaps in the preclinical TBI literature: the effect of injury on voluntary activity and energy metabolism, the extent to which exercise tolerance and cardiorespiratory fitness can be restored through moderate-intensity aerobic training, and whether these responses differ between sexes. Voluntary wheel running and metabolic outputs following CCI were quantified via the Comprehensive Lab Animal Monitoring System (CLAMS), while maximal oxygen uptake (VO₂ max) and time to exhaustion were measured before and after a 10-day treadmill training regimen initiated during the subacute phase. Both sexes displayed similar acute reductions in VO₂ max following TBI; however, only females exhibited significant gains in VO₂ max and exercise tolerance after exercise training, alongside higher spontaneous activity, greater energy expenditure, and smaller lesion volumes compared to males. Exercised females also exhibited selective cardiac upregulation of mitochondrial complex activity, indicating that enhanced mitochondrial capacity paralleled improved aerobic performance. In contrast, injured males showed persistent deficits and no measurable improvement in cardiovascular fitness or mitochondrial physiology from training, indicating a sex-specific limitation in aerobic adaptation. These findings reveal a divergence in post-TBI exercise responsiveness and highlight the need for sex-specific, physiology-guided rehabilitation strategies.
Keywords: Traumatic Brain Injury, aerobic exercise, exercise intolerance, cardiovascular fitness, sex differences
Received: 06 Sep 2025; Accepted: 20 Oct 2025.
Copyright: © 2025 Karelina, Corbin, Gumbo, Payne, Reger, Barr, Oldham, Shoemaker, Muthu, Meadows, Hollander and Weil. 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: Kate Karelina, ekaterina.weil@hsc.wvu.edu
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