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Moderate exercise increases the post exercise resting warm thermoregulatory response thresholds.
Aviat Space Environ Med. 2000 Sep; 71(9):914-9.AS

Abstract

BACKGROUND

The purpose of this study was to evaluate the effect of exercise on the subsequent post-exercise core temperature thresholds for vasodilation and sweating.

METHODS

On two separate days, with 6 subjects (3 males and 3 females), a whole-body water-perfused suit decreased mean skin temperature until the threshold for vasoconstriction was demonstrated. Mean skin temperature was then slowly increased (approximately 5.0 degrees C x h(-1)) until thresholds for vasodilation and sweating were clearly established. Subjects were cooled by decreasing water temperature until both esophageal and mean skin temperatures returned to near baseline values. Subjects then either performed 15 min of cycle ergometry (60% V(O2max)) followed by 30 min of recovery (Exercise), or remained seated with no exercise for 45 min (Control). Subjects were then cooled again until the onset of cutaneous vasoconstriction followed by a second warming period. The core temperature thresholds for vasodilation and sweating increased significantly by 0.49 degrees C and 0.19 degrees C post-exercise, respectively (p < 0.05). In order to compare thresholds between conditions in which both esophageal and mean skin temperatures were changing, we mathematically compensated for changes in skin temperatures using the established linear cutaneous contribution of skin to the control of vasodilation and sweating (10%).

RESULTS

The calculated core temperature threshold (at a designated skin temperature of 36.0 degrees C) for vasodilation increased significantly from 36.56 +/- 0.12 degrees C to 37.11 +/- 0.21 degrees C post-exercise (p < 0.01). Likewise, the sweating threshold increased from 36.79 +/- 0.18 degrees C to 37.05 +/- 0.23 degrees C postexercise (p < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease (0.18 degrees C) in the sweating threshold, with no difference in the vasodilation threshold.

CONCLUSION

These data indicate that exercise has a prolonged effect by increasing the post-exercise thresholds for both warm thermoregulatory responses.

Authors+Show Affiliations

University of Ottawa, Faculty of Health Sciences, School of Human Kinetics, Ontario, Canada. gkenny@uottawa.caNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11001344

Citation

Kenny, G P., et al. "Moderate Exercise Increases the Post Exercise Resting Warm Thermoregulatory Response Thresholds." Aviation, Space, and Environmental Medicine, vol. 71, no. 9, 2000, pp. 914-9.
Kenny GP, Proulx CE, Denis PM, et al. Moderate exercise increases the post exercise resting warm thermoregulatory response thresholds. Aviat Space Environ Med. 2000;71(9):914-9.
Kenny, G. P., Proulx, C. E., Denis, P. M., & Giesbrecht, G. G. (2000). Moderate exercise increases the post exercise resting warm thermoregulatory response thresholds. Aviation, Space, and Environmental Medicine, 71(9), 914-9.
Kenny GP, et al. Moderate Exercise Increases the Post Exercise Resting Warm Thermoregulatory Response Thresholds. Aviat Space Environ Med. 2000;71(9):914-9. PubMed PMID: 11001344.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Moderate exercise increases the post exercise resting warm thermoregulatory response thresholds. AU - Kenny,G P, AU - Proulx,C E, AU - Denis,P M, AU - Giesbrecht,G G, PY - 2000/9/23/pubmed PY - 2001/2/28/medline PY - 2000/9/23/entrez SP - 914 EP - 9 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 71 IS - 9 N2 - BACKGROUND: The purpose of this study was to evaluate the effect of exercise on the subsequent post-exercise core temperature thresholds for vasodilation and sweating. METHODS: On two separate days, with 6 subjects (3 males and 3 females), a whole-body water-perfused suit decreased mean skin temperature until the threshold for vasoconstriction was demonstrated. Mean skin temperature was then slowly increased (approximately 5.0 degrees C x h(-1)) until thresholds for vasodilation and sweating were clearly established. Subjects were cooled by decreasing water temperature until both esophageal and mean skin temperatures returned to near baseline values. Subjects then either performed 15 min of cycle ergometry (60% V(O2max)) followed by 30 min of recovery (Exercise), or remained seated with no exercise for 45 min (Control). Subjects were then cooled again until the onset of cutaneous vasoconstriction followed by a second warming period. The core temperature thresholds for vasodilation and sweating increased significantly by 0.49 degrees C and 0.19 degrees C post-exercise, respectively (p < 0.05). In order to compare thresholds between conditions in which both esophageal and mean skin temperatures were changing, we mathematically compensated for changes in skin temperatures using the established linear cutaneous contribution of skin to the control of vasodilation and sweating (10%). RESULTS: The calculated core temperature threshold (at a designated skin temperature of 36.0 degrees C) for vasodilation increased significantly from 36.56 +/- 0.12 degrees C to 37.11 +/- 0.21 degrees C post-exercise (p < 0.01). Likewise, the sweating threshold increased from 36.79 +/- 0.18 degrees C to 37.05 +/- 0.23 degrees C postexercise (p < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease (0.18 degrees C) in the sweating threshold, with no difference in the vasodilation threshold. CONCLUSION: These data indicate that exercise has a prolonged effect by increasing the post-exercise thresholds for both warm thermoregulatory responses. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/11001344/Moderate_exercise_increases_the_post_exercise_resting_warm_thermoregulatory_response_thresholds_ L2 - https://medlineplus.gov/exerciseandphysicalfitness.html DB - PRIME DP - Unbound Medicine ER -