a Institute of Sport Sciences and Physiotherapy; Estonian Centre of Behavioral and Health Sciences, University of Tartu, 50090 Tartu, Estonia.
b Department of Exercise and Sport Science; Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill, NC 27599, USA.
Appl Physiol Nutr Metab. 2018 Jan;43(1):63-70. doi: 10.1139/apnm-2017-0372. Epub 2017 Sep 5.
The adaptogen Rhodiola rosea (RR) may mitigate stress responses and have beneficial effects on endurance capacity (EC) and mental performance. Heat acclimation (HA) improves EC in the heat, but the potential impact of RR on the HA process is unknown. Therefore, our intent was to determine if RR has a positive impact on HA. Twenty male subjects (age, 22.5 ± 3.0 years) completed 2 EC tests involving walking (6 km·h) until volitional exhaustion in a climate chamber (air temperature, 42 °C; relative humidity, 18%) before (H1) and after (H2) an 8-day HA period. One group (SHR; n = 10) ingested standardised extract SHR-5 of RR (a single daily dose of 432 mg), while a second group (PLC; n = 10) administered a placebo prior to each HA session. Efficacy of HA was evaluated on the basis of changes that occurred from H1 to H2 in the time to exhaustion (TTE), exercise heart rate (HR), core and skin temperatures (T, T), stress hormones, ratings of perceived exertion (RPE) and fatigue (RPF), and thermal sensation (TS). HA significantly increased TTE (133.1 ± 44.1 min in H1; 233.4 ± 59.8 min in H2; p < 0.0001) and decreased (p < 0.0001) HR, T, T, stress hormones as well as RPE, RPF, and TS. However, the magnitude of all these changes was similar (p > 0.05) in the SHR and PLC groups. These results suggest that the use of RR during HA has no beneficial performance, physiological, or perceptual effects in young healthy males.
适应原红景天（RR）可能减轻应激反应，并对耐力能力（EC）和心理表现有有益影响。热适应（HA）可提高在热环境中的 EC，但 RR 对 HA 过程的潜在影响尚不清楚。因此，我们旨在确定 RR 是否对 HA 有积极影响。20 名男性受试者（年龄，22.5±3.0 岁）在气候室（空气温度，42°C；相对湿度，18%）中完成了 2 次 EC 测试，包括以 6km·h 的速度行走直至自愿力竭，一次是在 HA 期之前（H1），一次是在 HA 期之后（H2）。一组（SHR；n=10）在每次 HA 前服用标准化提取物 SHR-5 的 RR（每日单剂量 432mg），而第二组（PLC；n=10）在每次 HA 前服用安慰剂。HA 的功效是根据从 H1 到 H2 的变化来评估的，这些变化包括疲劳时间（TTE）、运动心率（HR）、核心和皮肤温度（T、T）、应激激素、感知用力（RPE）和疲劳（RPF）以及热感觉（TS）的变化。HA 显著增加了 TTE（H1 时为 133.1±44.1 分钟；H2 时为 233.4±59.8 分钟；p<0.0001），并降低了（p<0.0001）HR、T、T、应激激素以及 RPE、RPF 和 TS。然而，在 SHR 和 PLC 组中，所有这些变化的幅度都相似（p>0.05）。这些结果表明，在 HA 期间使用 RR 对年轻健康男性的运动表现、生理或感知没有有益影响。
