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首页> 外文期刊>American Journal of Physiology >Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise.
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Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise.

机译：在中度和重度动态前臂运动的开始和结束时，血流量和肌肉氧吸收。

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We hypothesized that forearm blood flow (FBF) during moderate intensity dynamic exercise would meet the demands of the exercise and that postexercise FBF would quickly recover. In contrast, during heavy exercise, FBF would be inadequate causing a marked postexercise hyperemia and sustained increase in muscle oxygen uptake (VO(2musc)). Six subjects did forearm exercise (1-s contraction/relaxation, 1-s pause) for 5 min at 25 and 75% of peak workload. FBF was determined by Doppler ultrasound, and O(2) extraction was estimated from venous blood samples. In moderate exercise, FBF and VO(2musc) increased within 2 min to steady state. Rapid recovery to baseline suggested adequate O(2) supply during moderate exercise. In contrast, FBF was not adequate during heavy dynamic exercise. Immediately postexercise, there was an approximately 50% increase in FBF. Furthermore, we observed for the first time in the recovery period an increase in VO(2musc) above end-exercise values. During moderate exercise, O(2) supply met requirements, but with heavy forearm exercise, inadequate O(2) supply during exercise caused accumulation of a large O(2) deficit that was repaid during recovery.
机译：我们假设在中等强度的动态锻炼过程中前臂血流（FBF）可以满足锻炼的需求，并且运动后的FBF可以很快恢复。相反，在剧烈运动中，BFF将不足以引起运动后充血，并持续增加肌肉吸氧量（VO（2musc））。 6名受试者在峰值负荷的25％和75％时进行了5分钟的前臂运动（1秒收缩/放松，1秒暂停）。通过多普勒超声确定FBF，并从静脉血样本中估计O（2）提取量。在中等运动中，FBF和VO（2musc）在2分钟内增加至稳态。快速恢复至基线水平表明在中等运动期间有足够的O（2）供应。相反，在剧烈运动中，BFF不足。运动后立即，FBF增加约50％。此外，我们在恢复期首次观察到高于最终运动值的VO（2musc）增加。在适度运动中，O（2）的供应量符合要求，但前臂运动较重时，运动期间O（2）的供应不足会导致积累大量O（2）的赤字，并在恢复期间予以弥补。

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