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Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia
Journal of the International Society of Sports Nutrition ( IF 4.5 ) Pub Date : 2020-01-06 , DOI: 10.1186/s12970-019-0331-6
E Tavares-Silva 1 , F F Donatto 2 , R M V Medeiros 3 , S A Santos 2 , A V Caris 1 , R V Thomatieli-Santos 1, 2
Affiliation  

BackgroundRating of Perceived Exertion (RPE) is a subjective scale to monitor overload and fatigue during exercise. Hypoxia may worsen the perception of fatigue, compromising the self-reported perception of effort and increasing RPE. The objective was to evaluate the effects of carbohydrate (CHO) supplementation on RPE during exercise in hypoxia simulating 4200 m.MethodsEight male physically active volunteers performed two exercises at 50% VO2peak and 1% slope: exercise in hypoxia + placebo or exercise in hypoxia + CHO (6% maltodextrin) with supplementation at 20, 40, and 60 min during exercise. Oxygen Saturation (SaO2%) was assessed at baseline and after exercise, while RPE and HR were measured each 10 min during the trial.ResultsSaO2% decreased after exercise in both conditions of hypoxia compared to rest. The RPE did not differ between groups. However, the RPE increased in hypoxia after 20 min of exercise in relation to 10 min. The Area Under the Curve (AUC) of RPE was lower in hypoxia + CHO compared to hypoxia. The AUC of the HR/RPE ratio in the hypoxia + CHO group was higher in relation to hypoxia.ConclusionsOur results indicate that CHO supplementation does not change RPE induced by 60 min of exercise at 50% VO2peak in hypoxia equivalent to 4200 m at the different times analyzed. However, in hypoxia + CHO the (AUC)-60 min of total RPE decreased during exercise, while the heart rate/RPE ratio improved, indicating lower RPE in the hypoxic environment.

中文翻译:

缺氧中度运动期间的碳水化合物补充和心理生理反应

感知用力 (RPE) 的背景评级是一种主观量表,用于监测运动过程中的超负荷和疲劳。缺氧可能会加重疲劳感,影响自我报告的努力感并增加 RPE。目的是评估碳水化合物 (CHO) 补充剂在模拟 4200 米缺氧运动期间对 RPE 的影响。 方法 八名身体活跃的男性志愿者在 50% VO2peak 和 1% 斜率下进行了两次运动:缺氧运动 + 安慰剂或缺氧运动 + CHO(6% 麦芽糖糊精),在锻炼期间在 20、40 和 60 分钟补充。在基线和运动后评估氧饱和度 (SaO2%),而在试验期间每 10 分钟测量一次 RPE 和 HR。结果 与休息相比,在两种缺氧条件下运动后 SaO2% 均下降。组间 RPE 没有差异。然而,与运动 10 分钟相比,运动 20 分钟后缺氧时 RPE 增加。与缺氧相比,缺氧 + CHO 中 RPE 的曲线下面积 (AUC) 较低。缺氧 + CHO 组中 HR/RPE 比的 AUC 与缺氧相关。结论我们的结果表明,在相当于 4200 m 的缺氧条件下,在 50% VO2peak 下,补充 CHO 不会改变运动 60 分钟诱导的 RPE。次分析。然而,在缺氧 + CHO 条件下,运动过程中总 RPE 的 (AUC)-60 分钟下降,而心率/RPE 比率提高,表明缺氧环境下 RPE 较低。缺氧 + CHO 组中 HR/RPE 比的 AUC 与缺氧有关。结论我们的结果表明,在相当于 4200 m 的缺氧条件下,在 50% VO2peak 下,补充 CHO 不会改变运动 60 分钟诱导的 RPE。次分析。然而,在缺氧 + CHO 条件下,运动过程中总 RPE 的 (AUC)-60 分钟下降,而心率/RPE 比率提高,表明缺氧环境下 RPE 较低。缺氧 + CHO 组中 HR/RPE 比的 AUC 与缺氧相关。结论我们的结果表明,在相当于 4200 m 的缺氧条件下,在 50% VO2peak 下,补充 CHO 不会改变运动 60 分钟诱导的 RPE次分析。然而,在缺氧 + CHO 条件下,运动过程中总 RPE 的 (AUC)-60 分钟下降,而心率/RPE 比率提高,表明缺氧环境下 RPE 较低。
更新日期:2020-01-06
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