A 5-day Heat Acclimation Program Improves Heat Stress Indicators While Maintaining Exercise Capacity
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Floris C. Wardenaar [1] ; Carmen P. Ortega Santos ; Kaila A.S. Vento, [1] ; Joshua S. Beaumont [1] ; Stephanie C. Griffin [2] ; Carol S. Johnston [1] ; Stavros A. Kavouras [1]
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[1] Arizona State University
Arizona State University
Estados Unidos
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[2] University of Arizona
University of Arizona
Estados Unidos
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- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 5, 2021, págs. 1279-1286
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This study aimed to evaluate whether a daily 60 minutes isothermic biking protocol during a 5-day period could improve physiological heat acclimation and exercise performance capacity in partially acclimated subjects. A quasi-experimental study consisted of an intervention (INT, n = 7) and control (CON, n = 7) group completing 2 12 minutes Cooper tests (pre-CT on day 1 and post-CT on day 7) and a heat stress test (HST, on day 9). INT performed additional intensive exercise 1 hour per day on days 1-5, whereas CON did not. During CTs and HST, core temperature (Tc, telemetric capsule), skin temperature (Tsk, sensors at neck, right shoulder, left hand, and right shin), and heart rate (HR, chest strap) were continuously monitored and baseline, average, peak, and increment were calculated. During the HST, the INT group showed a smaller baseline-peak Tc increment (INT 0.88 +/- 0.27 vs. CON 1.64 +/- 0.90[degrees] C, p = 0.02), a lower HR peak (150.2 +/- 12.6 vs. 173.0 +/- 16.8 b[middle dot]min-1, p = 0.02), and lower Tsk peak (36.47 +/- 0.62 vs. 36.54 +/- 0.46[degrees] C, p = 0.04). There was a nonsignificant, but practical difference based on a moderate effect size for change in pre-CT to post-CT performance of nearly +2.7 +/- 12.3% in INT and -3.0 +/- 8.5% in CON (p = 0.32 and d = 0.51), and HST distance covered resulting in a nonsignificant difference of 464 +/- 849 m between INT and CON (p = 0.38 and d = 0.44). In conclusion a short-term 5-day heat acclimation program including 300 minutes of extra exercise resulted in positive physiological adaptions to heat stress, as indicated by lower core temperature and HR in comparison with a control group
