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No effect of moderate hypohydration or hyperthermia on anaerobic exercise performance.
Med Sci Sports Exerc. 2006 Jun; 38(6):1093-7.MS

Abstract

PURPOSE

This study examined the effects of hypohydration and moderate hyperthermia (core temperature elevation) on anaerobic exercise performance in a temperate environment.

METHODS

Eight active males completed two passive heat exposure trials (180 min, 45 degrees C, 50% rh) with (EUH) and without (HYP) fluid replacement. A single 15-s Wingate anaerobic test (WAnT) was used to assess anaerobic performance (peak power, mean power, and fatigue index) before (-180 min) and again at three time points after passive heat exposure to include immediately (0 min), 30 min, and 60 min after in a temperate environment (22 degrees C). Rectal temperature (Tc) was measured throughout the experiment.

RESULTS

HYP reduced body mass (2.7+/-0.7%) (P<0.05) but had no effect on any WAnT performance measure. Passive heat exposure elicited moderate hyperthermia in both trials (EUH: 0.6 degrees C; HYP: 1.0 degrees C) and returned to baseline within 30-60 min following similar decay curves. HYP Tc remained higher (0.4 degrees C) than EUH throughout testing (P<0.05), but moderate hyperthermia itself produced no independent effect on anaerobic exercise performance in either trial.

CONCLUSIONS

This study demonstrates that neither moderate HYP nor the moderate hyperthermia accompanying HYP by passive heat exposure affect anaerobic exercise performance in a temperate environment.

Authors+Show Affiliations

U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760, USA. Samuel.cheuvront@na.amedd.army.milNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16775551

Citation

Cheuvront, Samuel N., et al. "No Effect of Moderate Hypohydration or Hyperthermia On Anaerobic Exercise Performance." Medicine and Science in Sports and Exercise, vol. 38, no. 6, 2006, pp. 1093-7.
Cheuvront SN, Carter R, Haymes EM, et al. No effect of moderate hypohydration or hyperthermia on anaerobic exercise performance. Med Sci Sports Exerc. 2006;38(6):1093-7.
Cheuvront, S. N., Carter, R., Haymes, E. M., & Sawka, M. N. (2006). No effect of moderate hypohydration or hyperthermia on anaerobic exercise performance. Medicine and Science in Sports and Exercise, 38(6), 1093-7.
Cheuvront SN, et al. No Effect of Moderate Hypohydration or Hyperthermia On Anaerobic Exercise Performance. Med Sci Sports Exerc. 2006;38(6):1093-7. PubMed PMID: 16775551.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - No effect of moderate hypohydration or hyperthermia on anaerobic exercise performance. AU - Cheuvront,Samuel N, AU - Carter,Robert,3rd AU - Haymes,Emily M, AU - Sawka,Michael N, PY - 2006/6/16/pubmed PY - 2006/10/28/medline PY - 2006/6/16/entrez SP - 1093 EP - 7 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 38 IS - 6 N2 - PURPOSE: This study examined the effects of hypohydration and moderate hyperthermia (core temperature elevation) on anaerobic exercise performance in a temperate environment. METHODS: Eight active males completed two passive heat exposure trials (180 min, 45 degrees C, 50% rh) with (EUH) and without (HYP) fluid replacement. A single 15-s Wingate anaerobic test (WAnT) was used to assess anaerobic performance (peak power, mean power, and fatigue index) before (-180 min) and again at three time points after passive heat exposure to include immediately (0 min), 30 min, and 60 min after in a temperate environment (22 degrees C). Rectal temperature (Tc) was measured throughout the experiment. RESULTS: HYP reduced body mass (2.7+/-0.7%) (P<0.05) but had no effect on any WAnT performance measure. Passive heat exposure elicited moderate hyperthermia in both trials (EUH: 0.6 degrees C; HYP: 1.0 degrees C) and returned to baseline within 30-60 min following similar decay curves. HYP Tc remained higher (0.4 degrees C) than EUH throughout testing (P<0.05), but moderate hyperthermia itself produced no independent effect on anaerobic exercise performance in either trial. CONCLUSIONS: This study demonstrates that neither moderate HYP nor the moderate hyperthermia accompanying HYP by passive heat exposure affect anaerobic exercise performance in a temperate environment. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/16775551/No_effect_of_moderate_hypohydration_or_hyperthermia_on_anaerobic_exercise_performance_ L2 - https://doi.org/10.1249/01.mss.0000222838.74015.15 DB - PRIME DP - Unbound Medicine ER -