Endurance Capacity Impairment in Cold Air Ranging from Skin Cooling to Mild Hypothermia
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
Published in
Journal of Applied PhysiologyAuthors
Date
2024Copyright
© 2023, Journal of Applied Physiology
Introduction: We tested the effects of cold air (0°C) exposure on endurance capacity to different levels of cold strain ranging from skin cooling to core cooling of ∆-1.0°C.
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.
...
Publisher
American Physiological SocietyISSN Search the Publication Forum
8750-7587Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/194524752
Metadata
Show full item recordCollections
- Liikuntatieteiden tiedekunta [3076]
Additional information about funding
This study was supported by a Discovery grant from the Natural Science and Engineering Research Council (NSERC) of Canada (SSC, 2018-04077). PJW was supported through a NSERC Doctoral (PGS D) scholarship, Ontario Graduate Scholarship, and Queen Elizabeth II 570 Graduate Scholarship in Science & Technology over the course of this research.License
Related items
Showing items with similar title or keywords.
-
Effects of skin and mild core cooling on cognitive function in cold air in men
Wallace, Phillip J.; Gagnon, Dominique D.; Hartley, Geoffrey L.; Taber, Michael J.; Cheung, Stephen S. (Wiley, 2023)This study tested the effects of skin and core cooling on cognitive function in 0°C cold air. Ten males completed a randomized, repeated measures study consisting of four environmental conditions: (i) 30 min of exposure ... -
Sotilas kylmässä : toimintakyky ja suojautuminen
Rissanen, Sirkka; Kyröläinen, Heikki; Santtila, Matti (Maanpuolustuskorkeakoulu, 2021) -
Kylmäaltistuksen ja vaatetuksen vaikutus aerobisen kuormituksen aikana : vaikutus ihmisen eräisiin fysiologisiin muuttujiin ja subjektiivisiin tuntemuksiin
Sorvisto, Pasi; Vaappo, Marko (2001) -
Elimistö lujilla ääriolosuhteissa
Peltonen, Juha E.; Gagnon, Dominique D. (Liikuntatieteellinen seura, 2024)Ympäristöfysiologia lisää tietämystä urheilijoihin ja ääriolosuhteissa toimiviin kohdistuvista ympäristön vaikutuksista. Elimistöön vaikuttavat niin kuumuus ja kylmyys kuin hapen liian vähäinen tai runsas saanti. -
Thyroid Hormone Coordination of Thermogenesis and Thermoregulation in Winter Passerines
Crisp, Alma (2023)Small wild birds withstanding cold temperatures have to utilize efficient and diverse methods of heat production and regulation. Thyroid hormones (THs) contribute greatly to thermogenesis and thermoregulation through key ...