EFFECT OF BRIEF CONTRACTION OF FOREARM MUSCLES ON FOREARM BLOOD FLOW
EFFECT OF BRIEF CONTRACTION OF FOREARM MUSCLES ON FOREARM BLOOD FLOW
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DOI：
10.1152/jappl.1964.19.1.142
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发表时间：
1964-01-01
影响因子：
3.3
通讯作者：
KOROXENIDIS, GT
中科院分区：
文献类型：
--
作者：
CORCONDILAS, A;SHEPHERD, JT;KOROXENIDIS, GT
使用应变式体积描记仪，研究了8名健康成人前臂肌肉短暂收缩(0.3秒)对前臂血流量的影响。在收缩完成后的一秒钟内，可以检测到由于肌肉血管扩张而导致的流量增加。这一增长与收缩的强度成正比。血流量即刻最大，并迅速下降。在流量增加期间发生的第二次相同幅度的收缩导致了流量的额外增加。由强烈的短暂收缩引起的最大流量增加仅为强烈反复节律收缩或持续收缩后的25%左右。颈交感神经切除术没有改变这些发现，表明反应的局部性质。由于呼吸氧气不能在给定的收缩强度下减少扩张，因此缺氧不太可能是血管扩张的刺激因素。肌肉收缩后，排出肌肉的血液的血氧饱和度无法立即准确测定，因为此时肌肉静脉血被皮肤的静脉血污染。
With the use of a strain-gauge plethysmography, the effect of a brief (0.3 sec) contraction of the forearm muscles on forearm blood flow has been studied in eight healthy adults. An increase in flow due to dilatation of the muscle vessels could be detected within a second after the completion of the contraction. This increase was proportional to the strength of the contraction. The blood flow was maximal immediately and decreased rapidly. A second contraction of the same magnitude made during the period of increased flow caused an additional increase in flow. The maximal increase in flow caused by a strong brief contraction was only about 25% of that recorded after strong repeated rhythmic contractions or a sustained contraction. Cervical sympathectomy did not change these findings, indicating the local nature of the response. Since breathing oxygen failed to reduce the dilatation for a given strength of contraction, it is unlikely that oxygen lack was the stimulus for vasodilatation. The oxygen saturation of blood that drained the muscles could not be determined accurately immediately after contraction because at this time, muscle venous blood was contaminated by venous blood from the skin.