Athleat Field Lab, College of Health Solutions, Arizona State University, Phoenix, Arizona.
Sun Devil Athletics, Arizona State University, Tempe, Arizona.
J Strength Cond Res. 2021 May 1;35(5):1279-1286. doi: 10.1519/JSC.0000000000003970.
Wardenaar, FC, Ortega-Santos, CP, Vento, K, Beaumont, JS, Griffin, SC, Johnston, C, and Kavouras, SA. A 5-day heat acclimation program improves heat stress indicators while maintaining exercise capacity. J Strength Cond Res 35(5): 1279-1286, 2021-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° C, p = 0.02), a lower HR peak (150.2 ± 12.6 vs. 173.0 ± 16.8 b·min-1, p = 0.02), and lower Tsk peak (36.47 ± 0.62 vs. 36.54 ± 0.46° 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.
沃德纳尔，FC，奥特加-桑托斯，CP，文托，K，博蒙特，JS，格里芬，SC，约翰斯顿，C，和卡沃尔拉斯，SA。一项为期 5 天的热适应方案可改善热应激指标，同时保持运动能力。J 力量与调节研究 35(5)：1279-1286，2021-本研究旨在评估在部分适应的受试者中，每天 60 分钟的等温热骑行方案是否可以改善生理热适应和运动能力。一项准实验研究包括干预（INT，n = 7）和对照组（CON，n = 7），两组均进行 2 次 12 分钟库珀测试（第 1 天的预 CT 和第 7 天的后 CT）和热应激测试（HST，第 9 天）。INT 在第 1-5 天每天额外进行 1 小时的强化运动，而 CON 则没有。在 CT 和 HST 期间，连续监测核心温度（Tc，遥测胶囊）、皮肤温度（Tsk，颈部、右肩、左手和右胫骨上的传感器）和心率（HR，胸带），并计算基线、平均、峰值和增量。在 HST 期间，INT 组显示出较小的基础-峰值 Tc 增量（INT 0.88 ± 0.27 与 CON 1.64 ± 0.90°C，p = 0.02），较低的 HR 峰值（150.2 ± 12.6 与 173.0 ± 16.8 b·min-1，p = 0.02）和较低的 Tsk 峰值（36.47 ± 0.62 与 36.54 ± 0.46°C，p = 0.04）。虽然有一个基于中等效应大小的无显著意义但实际的变化，INT 组的预 CT 到后 CT 性能提高了近 +2.7 ± 12.3%，而 CON 组降低了 -3.0 ± 8.5%（p = 0.32 和 d = 0.51），但 HST 覆盖的距离在 INT 和 CON 之间仅显示出无显著意义的差异，分别为 464 ± 849 m（p = 0.38 和 d = 0.44）。总之，一项包括 300 分钟额外运动的短期 5 天热适应方案导致了对热应激的积极生理适应，与对照组相比，核心温度和 HR 较低。
