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Exercise thermoregulation in men after 6 hours of immersion.
Aviat Space Environ Med. 1985 Jan; 56(1):15-8.AS

Abstract

Rectal (Tre) and mean skin (Tsk) temperature, skin heat conductance (Ksk), heart rate, and total body sweat rate were measured in 6 men (20-35 years) during 70 min of supine leg exercise (Ta = 23.5 degrees C, rh = 40%) at 50% of their peak O2 uptake (VO2 peak); these data were taken after a 6-h control (C) period in air and after immersion to the neck (NI) in water (34.5 degrees C) for 6 h after overnight food and fluid restriction. After NI mean (+/- S.E.) water balance was -1,285 +/- 104 ml for the 6 h and plasma volume (delta Hb and Hct) decreased by 5.2%. End exercise heart rates after C (141 +/- 3 b X min-1) increased to 148 +/- 3 b X min-1 (p less than 0.05) after NI while Vo2 were both 2.2 L X min-1 Tre increased by 0.5 C degrees (p less than 0.05) between the end of NI and the start of exercise. During exercise following C and NI, delta Tre were +1.0 degrees C and +0.9 degrees C (NS), Ksk were 44 +/- 2 and 43 +/- 1 kcal X m-2 X hr-1 X degrees C-1 (NS), while sweat rates increased from 248 +/- 19 to 366 +/- 52 g X h-1 (p less than 0.05), respectively. Both the total integrated Tre and Tsk curves after NI were higher (p less than 0.05) than for C. These results suggest that, compared with control responses, the equilibrium level of core temperature during submaximal exercise is regulated at a higher level after immersion.

Authors

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Pub Type(s)

Journal Article

Language

eng

PubMed ID

3977798

Citation

Greenleaf, J E., et al. "Exercise Thermoregulation in Men After 6 Hours of Immersion." Aviation, Space, and Environmental Medicine, vol. 56, no. 1, 1985, pp. 15-8.
Greenleaf JE, Spaul WA, Kravik SE, et al. Exercise thermoregulation in men after 6 hours of immersion. Aviat Space Environ Med. 1985;56(1):15-8.
Greenleaf, J. E., Spaul, W. A., Kravik, S. E., Wong, N., & Elder, C. A. (1985). Exercise thermoregulation in men after 6 hours of immersion. Aviation, Space, and Environmental Medicine, 56(1), 15-8.
Greenleaf JE, et al. Exercise Thermoregulation in Men After 6 Hours of Immersion. Aviat Space Environ Med. 1985;56(1):15-8. PubMed PMID: 3977798.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Exercise thermoregulation in men after 6 hours of immersion. AU - Greenleaf,J E, AU - Spaul,W A, AU - Kravik,S E, AU - Wong,N, AU - Elder,C A, PY - 1985/1/1/pubmed PY - 1985/1/1/medline PY - 1985/1/1/entrez SP - 15 EP - 8 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 56 IS - 1 N2 - Rectal (Tre) and mean skin (Tsk) temperature, skin heat conductance (Ksk), heart rate, and total body sweat rate were measured in 6 men (20-35 years) during 70 min of supine leg exercise (Ta = 23.5 degrees C, rh = 40%) at 50% of their peak O2 uptake (VO2 peak); these data were taken after a 6-h control (C) period in air and after immersion to the neck (NI) in water (34.5 degrees C) for 6 h after overnight food and fluid restriction. After NI mean (+/- S.E.) water balance was -1,285 +/- 104 ml for the 6 h and plasma volume (delta Hb and Hct) decreased by 5.2%. End exercise heart rates after C (141 +/- 3 b X min-1) increased to 148 +/- 3 b X min-1 (p less than 0.05) after NI while Vo2 were both 2.2 L X min-1 Tre increased by 0.5 C degrees (p less than 0.05) between the end of NI and the start of exercise. During exercise following C and NI, delta Tre were +1.0 degrees C and +0.9 degrees C (NS), Ksk were 44 +/- 2 and 43 +/- 1 kcal X m-2 X hr-1 X degrees C-1 (NS), while sweat rates increased from 248 +/- 19 to 366 +/- 52 g X h-1 (p less than 0.05), respectively. Both the total integrated Tre and Tsk curves after NI were higher (p less than 0.05) than for C. These results suggest that, compared with control responses, the equilibrium level of core temperature during submaximal exercise is regulated at a higher level after immersion. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/3977798/Exercise_thermoregulation_in_men_after_6_hours_of_immersion_ L2 - https://antibodies.cancer.gov/detail/CPTC-KRAS4B-1 DB - PRIME DP - Unbound Medicine ER -