THE RELATION BETWEEN FORCE, VELOCITY AND INTEGRATED ELECTRICAL ACTIVITY IN HUMAN MUSCLES
THE RELATION BETWEEN FORCE, VELOCITY AND INTEGRATED ELECTRICAL ACTIVITY IN HUMAN MUSCLES
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DOI：
10.1113/jphysiol.1954.sp005044
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发表时间：
1954-01-01
影响因子：
5.5
通讯作者：
LIPPOLD, OCJ
中科院分区：
文献类型：
--
作者：
BIGLAND, B;LIPPOLD, OCJ
在腓肠肌等张力缩短和延长过程中，由表面电极记录的人类腓肠肌随意收缩的动作电位被电子整合。比较了表面电极和针电极的结果。在恒定的缩短或延长速度下，电活动与张力成正比，这种关系的斜率在延长时较小。在恒定张力下，电活动随肌肉缩短的速度线性增加，但当肌肉被拉长时，电活动几乎与速度无关。这种关系适用于可能的速度范围。备注说明。，但在更高的速度下不会这样做。这一结果可以由希尔力-速度方程来预测。张力、速度和电活动是相互依赖的，电记录的集成提供了对电流的综合测量。活性纤维和它们的激发频率。
Action potentials recorded by surface electrodes from voluntary contractions of human gastrocnemius muscle were integrated electronically during isotonic shortening and lengthening of the muscle. Results from surface and needle electrodes were compared. At constant velocity of shortening or lengthening, the electrical activity was directly proportional to the tension, the slope of this relation being less in lengthening. At constant tension, the electrical activity increased linearly with velocity of shortening, but remained almost independent of speed when the muscle was being lengthened. The relation held over the range of velocities possible in the expts. descr., but would not be expected to do so at higher velocities. This result could be predicted from Hill''s force-velocity equation. Tension, velocity, and electrical activity are interdependent, and integration of the electrical record provides a composite measure of the no. of active fibers and their frequency of excitation.