THE EFFECT OF EXERCISE ON THE VASCULAR BED OF SKELETAL MUSCLE.
THE EFFECT OF EXERCISE ON THE VASCULAR BED OF SKELETAL MUSCLE.
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运动对骨骼肌血管床的影响。
DOI：
10.1111/j.1748-1716.1964.tb03947.x
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发表时间：
1964
期刊：
影响因子：
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通讯作者：
I. Kjellmer
中科院分区：
文献类型：
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作者：
I. Kjellmer
本文介绍了一种连续记录猫离体小腿肌肉体积变化的体积描记法。同时测量静脉流出量、动脉压和静脉压。通过刺激运动神经来模拟稳态运动。记录了阻力血管、电容血管和毛细管过滤系数中发生的变化。运动引起扩张的阻力血管，增加毛细血管过滤系数（扩张的毛细血管前括约肌）和扩张的电容血管。所有三个血管部分的扩张程度与运动的严重程度有关。结果表明，局部血容量的增加（容量血管扩张）主要是由到达容量血管的压头增加引起的，而不是由主动静脉扩张引起的。在运动过程中，由于毛细血管静水压力升高，并通过增加可供血流的毛细血管表面积而增强，因此存在净向外毛细血管过滤。毛细血管压力的升高是由扩张引起的，扩张对毛细血管前阻力血管的影响相对大于毛细血管后阻力血管。
A plethysmographic method is described which has been used for continuous recording of volumetric changes in the isolated calf muscles of cats. Venous outflow, arterial and venous pressures were measured simultaneously. Steady state exercise was mimicked by stimulation of the motor nerve. Changes occurring in the resistance vessels, in the capacitance vessels and in the capillary filtration coefficients were recorded. Exercise provoked a dilatation of the resistance vessels, an increase of the capillary filtration coefficient (dilatation of the precapillary sphincters) and a distension of the capacitance vessels. The degree of dilatation in all three vessel sections was related to the severity of exercise. It was shown that the increase in regional blood volume (dilatation of the capacitance vessels) is caused mainly by an increased pressure head reaching the capacitance vessels and not by an active venous dilatation. During exercise there was a net outward capillary filtration due to an elevated capillary hydrostatic pressure and augmented by an increased capillary surface area available to blood flow. The elevation of capillary pressure was caused by a dilatation, which affected the precapillary resistance vessels relatively more than the postcapillary.