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The time required for a mechanical impulse to propagate from one end to the other was measured directly in frog sartorius muscles and in fiber bundles from the semitendinosus muscle. When the fibers were fully activated, the transmission velocity was 170 mm/ms. In resting fibers the transmission time was three to four times greater than in activated fibers. Control experiments indicated that the transmission time across the tendons was negligible. A muscle compliance of 5580 Å per half sarcomere was estimated from these data. The "measurement time" of the method was calculated to be about 15 µs. This relatively short measurement time makes the method potentially useful for detecting changes in cross-bridge compliance.
Submitted on December 14, 1973
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G Cecchi, P. Griffiths, and S Taylor Muscular contraction: kinetics of crossbridge attachment studied by high-frequency stiffness measurements Science, July 2, 1982; 217(4554): 70 - 72. [Abstract] [PDF] |
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