Muscle activation during low-intensity muscle contractions with restricted blood flow
Muscle activation during low-intensity muscle contractions with restricted blood flow
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DOI：
10.1080/02640410802626567
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发表时间：
2009-01-01
影响因子：
3.4
通讯作者：
Abe, Takashi
中科院分区：
文献类型：
--
作者：
Yasuda, Tomohiro;Brechue, William F.;Abe, Takashi
我们在适度限制血流和完全阻断血流的情况下，检测了低强度肌肉收缩时的肌肉激活情况。实验1(30次收缩)、实验2(3次10次收缩)和实验3(30次重复收缩后3次15次收缩)进行中度限制、血流完全阻断或血流不受限制的单侧肘屈肌收缩(占1-RM的20%)。在肱二头肌上放置表面电极记录肌电(EMG)，得到积分EMG(IEMG)和平均功率频率(MPF)。在实验1和实验2中，在完全闭塞和适度限制血流到比对照组更大的水平时，肌肉激活逐渐增加。收缩后最大自主等长收缩(MVC)的下降在完全闭塞(39-48%)比中度血流限制(16-19%)更大；对照MVC没有变化。在实验3中，中度血流限制组的MVC、IEMG和MPF的变化比对照组更大，但与完全阻断血流的情况相当，因为完全阻断血流所需的总功较少。总而言之，适度的血流限制导致肌肉的神经表现与完全闭塞相似，但没有完全闭塞时所观察到的明显的收缩/代谢障碍。因此，低强度的肌肉收缩，加上适度的血流限制，会导致相对于外部负荷更强烈的肌肉激活。
We examined muscle activation during low-intensity muscle contractions with a moderate restriction of blood flow and complete occlusion of blood flow. Unilateral elbow flexion muscle contractions (20% of 1-RM) were performed in Experiment 1 (30 contractions), Experiment 2 (3 sets10 contractions), and Experiment 3 (30 repetitive contractions followed by 3 sets15 contractions) with moderate restriction, complete occlusion of blood flow or unrestricted blood flow (control). Electromyography (EMG) was recorded from surface electrodes placed on the biceps brachii muscle and the integrated EMG (iEMG) and mean power frequency (MPF) obtained. During Experiments 1 and 2, muscle activation was progressively increased in complete occlusion and moderate restriction of blood flow to levels greater than in the control. The decline in maximal voluntary isometric contraction (MVC) following the bout of contractions was greater with complete occlusion (39-48%) than moderate restriction of blood flow (16-19%); control MVC did not change. In Experiment 3, changes in MVC, iEMG, and MPF were greater with moderate restriction of blood flow than in the control but comparable with complete occlusion of blood flow where less total work was performed. In conclusion, moderate restriction of blood flow results in similar neural manifestations in muscle as complete occlusion of blood flow but without the apparent contractile/metabolic impairment observed with complete occlusion. Thus, low-intensity muscle contractions, with moderate restriction of blood flow, leads to more intense activation of the muscle relative to the external load.