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The thermoelasticity in rigor muscle was investigated using chemically skinned frog sartorius muscles. The use of chemically skinned muscles enabled us to study the thermoelasticity under various intracellular circumstances. Effects on the thermoelasticity of the presence or the absence of Ca and the lowering of pH in the rigor solution were investigated. All values of the thermoelastic heat: tension ratios obtained under various circumstances were within the range reported for active muscles. In rigor state, the cross-bridges are fixed on the thin filaments and head can no longer rotate. Hence the present results indicate that the thermoelasticity in active muscles originates from the thermoelasticity of the myofilaments or the cross-bridges.

Thermoelastic effect in chemically skinned frog skeletal muscle in rigor.