常压缺氧对上半身临界功率和无氧工作能力的影响。

Effects of normobaric hypoxia on upper body critical power and anaerobic working capacity.

作者信息

La Monica Michael B, Fukuda David H, Starling-Smith Tristan M, Wang Ran, Hoffman Jay R, Stout Jeffrey R

机构信息

Institute of Exercise Physiology & Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, USA.

出版信息

Respir Physiol Neurobiol. 2018 Feb;249:1-6. doi: 10.1016/j.resp.2017.12.002. Epub 2017 Dec 13.

DOI:10.1016/j.resp.2017.12.002

PMID:29247712

Abstract

PURPOSE

To evaluate the effects of moderate normobaric hypoxia on the parameters of the work-time relationship in the upper body.

METHODS

Twenty-one recreationally active men completed a graded exercise test in both normobaric hypoxia (H) and normoxia (N) to exhaustion on an arm ergometer to determine V̇Opeak and peak power output (PPO). Each participant completed four constant work-rate (CWR) arm-cranking tests at 90-120% PPO in both environmental conditions. Linear regression was used to estimate critical power (CP) and anaerobic working capacity (AWC) via work-time relationship during the CWR tests.

RESULTS

H significantly reduced V̇Opeak (N: 2.34 ± 0.34 L vs. H: 2.27 ± 0.34 L, p = 0.041), PPO (N: 125.29 ± 17.98 W vs. H: 121.11 ± 17.98 W, p = 0.001), and CP (N: 90.22 ± 12.88 W vs. H: 85.26 ± 9.64 W, p = 0.042), but had no effect on AWC (N: 9.16 ± 2.81 kJ vs. H: 8.75 ± 3.23 kJ, p = 0.600).

DISCUSSION

Moderate normobaric hypoxia appears to reduce CP in the upper body but has a variable effect on AWC.

摘要

目的

评估中度常压缺氧对上肢工作时间关系参数的影响。

方法

21名有休闲运动习惯的男性在常压缺氧（H）和常压常氧（N）环境下，在手臂测力计上进行递增运动试验直至力竭，以确定峰值摄氧量（V̇Opeak）和峰值功率输出（PPO）。每位参与者在两种环境条件下，以PPO的90%-120%完成四项恒定工作率（CWR）的手臂曲柄测试。在CWR测试期间，通过工作时间关系，使用线性回归来估计临界功率（CP）和无氧工作能力（AWC）。

结果

缺氧显著降低了V̇Opeak（常氧：2.34±0.34L vs. 缺氧：2.27±0.34L，p = 0.041）、PPO（常氧：125.29±17.98W vs. 缺氧：121.11±17.98W，p = 0.001）和CP（常氧：90.22±12.88W vs. 缺氧：85.26±9.64W，p = 0.042），但对AWC没有影响（常氧：9.16±2.81kJ vs. 缺氧：8.75±3.23kJ，p = 0.600）。