Heat Acclimation Improves Heat Tolerance Test Specificity in a Criteria-dependent Manner
适应
考试(生物学)
环境科学
生物
生态学
作者
Katherine M. Mitchell,Roy M. Salgado,Karleigh E. Bradbury,Nisha Charkoudian,Robert W. Kenefick,Samuel N. Cheuvront
出处
期刊:Medicine and Science in Sports and Exercise [Ovid Technologies (Wolters Kluwer)] 日期:2021-05-01卷期号:53 (5): 1050-1055被引量:5
标识
DOI:10.1249/mss.0000000000002545
摘要
Purpose This study aimed to characterize HTT specificity and to determine any effect of HA on the outcome. Methods Thirteen unacclimatized, healthy men (V˙O2peak, 43.0 ± 4.8 mL·kg-1⋅min-1) with no previous history of heat illness completed 8 d of HA using the HTT protocol (40°C/40% RH; 120 min; 5 km·h-1 and 2% grade). Heart rate (HR) and core temperature (Tcore) recorded every 5 min during exercise and at the end of 120 min (terminal value) were compared between days 1 and 8. Test specificity (given no previous history of heat illness, the probability of being heat tolerant) was calculated on days 1 and 8. Results There was a significant reduction in HR and Tcore between days 1 and 8, indicating successful HA. All volunteers successfully completed 120 min of walking on all days. HTT specificity ranged between 54% and 85% on day 1 and between 77% and 92% on day 8, depending on the HTT criteria used. Conclusion Young healthy men without any previous heat illness experienced a 15% to 46% false-positive fail rate for the HTT without HA. After HA, the false-positive fail rate decreased to between 8% and 13%. Outcomes of the HTT are significantly affected by the criteria used and by HA status. The use of HTT for RTA decisions should be done with the recognition of these effects.