Spontaneous Relaxation in Glycerol-Extracted Muscle Fiber Bundles

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Abstract
A muscle model system prepared from extracted dog psoas was shown to spontaneously relax or to maintain a maximal isometric contractile force dependent upon the medium in which it is suspended. In unbuffered KC1 the preparation exhibits spontaneous relaxation after a rapid contraction induced by the addition of physiological amounts of ATP to the system. If, however, the preparation is stimulated with the nucleotide in a buffered medium, no relaxation is seen but the maximal contractile force is maintained. Possible explanations of the relaxation phenomenon are given.

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