In single chemically skinned fibers of the rabbit skeletal muscle in the state of rigour and the calcium activation, the interrelationship between the strength and rigidity, in change of the sarcomeres length from 2.4 to 3.0 microns, of free calcium concentration (pCa = 6.75 +/- 5.5) and of interfilament distance, was studied. The strength-rigidity ratio under these conditions was found to be near to 1. The change in the sarcomeres length was also shown to affect the interrelationship pCa--strength, pCa--rigidity on account of the growth of the cooperation coefficient in the Hill equation.
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