A1 Journal article (refereed)
Endurance Capacity Impairment in Cold Air Ranging from Skin Cooling to Mild Hypothermia (2024)
Wallace, P. J., Hartley, G. L., Nowlan, J. G., Ljubanovich, J., Sieh, N., Taber, M. J., Gagnon, D. D., & Cheung, S. S. (2024). Endurance Capacity Impairment in Cold Air Ranging from Skin Cooling to Mild Hypothermia. Journal of Applied Physiology, 136(1), 58-69. https://doi.org/10.1152/japplphysiol.00663.2023
JYU authors or editors
Publication details
All authors or editors: Wallace, Phillip J.; Hartley, Geoffrey L.; Nowlan, Josh G.; Ljubanovich, Johnathan; Sieh, Nina; Taber, Michael J.; Gagnon, Dominique D.; Cheung, Stephen S.
Journal or series: Journal of Applied Physiology
ISSN: 8750-7587
eISSN: 1522-1601
Publication year: 2024
Publication date: 09/11/2023
Volume: 136
Issue number: 1
Pages range: 58-69
Publisher: American Physiological Society
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1152/japplphysiol.00663.2023
Publication open access: Not open
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/92145
Abstract
Methods: Ten males completed cycling time-to-exhaustion (TTE) at 70% of their peak power output following: i) 30-min of exposure to 22°C thermoneutral air (TN), ii) 30-min exposure to 0°C air leading to a cold shell (CS), iii) 0°C air exposure causing mild hypothermia of -0.5°C from baseline rectal temperature (HYPO-0.5°C), and iv) 0°C air exposure causing mild hypothermia of -1.0°C from baseline rectal temperature (HYPO-1.0°C). The latter three conditions tested TTE in 0°C air.
Results: Core temperature and seven-site mean skin temperature at the start of the TTE were: TN (37.0 ± 0.2°C, 31.2 ± 0.8°C), CS (37.1 ± 0.3°C, 25.5 ± 1.4°C), HYPO-0.5°C (36.6 ± 0.4°C, 22.3 ± 2.2°C), HYPO-1.0°C (36.4 ± 0.5°C, 21.4 ± 2.7°C). There was a significant condition effect (p≤0.001) for TTE, where TTE declined from TN (23.75 ± 13.75 min) to CS (16.22 ± 10.30 min, ∆-30.9 ± 21.5%, p=0.055), HYPO-0.5°C (8.50 ± 5.23 min, ∆-61.4 ± 19.7, p≤0.001), and HYPO-1.0°C (6.50 ± 5.60 min, ∆-71.6 ± 16.4%, p≤0.001). Furthermore, participants had a greater endurance capacity in CS compared to HYPO-0.5°C (p=0.046), and HYPO-1.0°C (p=0.007), with no differences between HYPO-0.5°C and HYPO-1.0°C (p=1.00).
Conclusion: Endurance capacity impairment at 70% peak power output occurs early in cold exposure with skin cooling and inadequate clothing, with significantly larger impairments with mild hypothermia up to ∆-1.0°C.
Keywords: cold; endurance; performance (capacity); hypothermia; body temperature; temperature; exposure; skin; clothes
Free keywords: core cooling; mild hypothermia; endurance capacity; cold strain; heat debt
Contributing organizations
Ministry reporting: Yes
VIRTA submission year: 2023
Preliminary JUFO rating: 2
