Objectives: The purpose this study was investigate the effects of different vascular occlusion levels (total occlusion (TO), partial occlusion (PO) or free flow (FF)) during intermittent isometric handgrip exercise (IIHE) on the time to failure (TF) and the recovery of the maximum voluntary isometric force (MVIF), median frequency (EMGFmed) and peak of EMG signal (EMGpeak) after failure. Methods: Thirteen healthy men (21 ± 1.71 year) carried out an IIHE until the failure at 45% of MVIF with TO, PO or FF. Occlusion pressure was determined previously to the exercise. The MVIF, EMGFmed and EMGpeak were measured before and after exercise. Results: TF (in seconds) was significantly different (p < 0.05) among all investigated conditions: TO (150 ± 68), PO (390 ± 210) and FF (510 ± 240). The MVIF was lower immediately after IIHE, remaining lower eleven minutes after failure in all cases (p <0.05), when compared to pre exercise. There was a greater force reduction (p <0.05) one minute after the failure in the PO (-45.8%) and FF (-39.9%) conditions, when compared to TO (-28.1%). Only the PO condition caused lower MVIF (p <0.05) than in the OT, eleven minutes after the task failure. PO caused a greater reduction in EMGFmed compared TO and greater increase in EMGpeak, when compared to TO and FF (p <0.05). Conclusions: TO during IIHE lead to a lower time to failure, but a faster MVIF recovery, while the PO seems to be associated to a slower neuromuscular recovery, when compared to other conditions.

中文翻译：

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在不同程度的血管闭塞下，间歇性等距运动的失败时间和神经肌肉反应：一项随机交叉研究

目的：本研究的目的是研究间歇性等距手柄锻炼（IIHE）期间不同血管阻塞水平（总阻塞（TO），部分阻塞（PO）或自由流（FF））对衰竭时间（TF）的影响并在故障后恢复最大自愿等距力（MVIF），中位频率（EMGFmed）和EMG信号峰值（EMGpeak）。方法：13名健康男性（21±1.71岁）进行了IIHE，直到MVIF达到45％的TO，PO或FF失败。在运动之前确定阻塞压力。运动前后分别测量MVIF，EMGFmed和EMGpeak。结果：在所有研究的条件下：TF（以秒为单位）显着不同（p <0.05）：TO（150±68），PO（390±210）和FF（510±240）。IIHE之后，MVIF降低，与锻炼前相比，在所有情况下，患者在失败后的其余11分钟均较低（p <0.05）。与TO（-28.1％）相比，在PO（-45.8％）和FF（-39.9％）条件下，失效后一分钟的力降低更大（p <0.05）。在任务失败后的11分钟内，只有PO条件导致的MVIF（p <0.05）低于OT。与TO和FF相比，PO与TO相比导致EMGFmed的下降更大，而EMGpeak的上升更大（p <0.05）。结论：与其他情况相比，IIHE期间的TO导致了更短的衰竭时间，但MVIF恢复更快，而PO似乎与较慢的神经肌肉恢复有关。05）与TO（-28.1％）相比，在PO（-45.8％）和FF（-39.9％）条件下失效后一分钟。在任务失败后的11分钟内，只有PO条件导致的MVIF（p <0.05）低于OT。与TO和FF相比，PO与TO相比导致EMGFmed的下降更大，而EMGpeak的上升更大（p <0.05）。结论：与其他情况相比，IIHE期间的TO导致了更短的衰竭时间，但MVIF恢复更快，而PO似乎与较慢的神经肌肉恢复有关。05）与TO（-28.1％）相比，在PO（-45.8％）和FF（-39.9％）条件下失效后一分钟。在任务失败后的11分钟内，只有PO条件导致的MVIF（p <0.05）低于OT。与TO和FF相比，PO与TO相比导致EMGFmed的下降更大，而EMGpeak的上升更大（p <0.05）。结论：与其他情况相比，IIHE期间的TO导致了更短的衰竭时间，但MVIF恢复更快，而PO似乎与较慢的神经肌肉恢复有关。