SOME RHEOLOGICAL MEASUREMENTS IN RESTING MUSCLES OF THE FROG

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Abstract
The mechanical properties of frog muscles, especially the elasticity in addition to the viscosity and plasticity, were investigated. The load-extension curve has two phases; namely, the first exponential phase for the lighter loads and the second linear phase obeying Hooke''s law for the heavier loads. Under non-physiological conditions, the linearity of the curve tended to increase in most muscles. For the temperature change ranging from 5[degree] to 40[degree]C, the slopes of the second phase in load-extension curves were not affected in most cases. Modified Young''s modulus E was calculated, using sartorius (S), hyoglossus (H), ventricle (V) and oesophagus (O) muscles. The order of the arithmetic means of moduli was as follows: S > H > O > V. Usually the values ranged from 105 to 107 dyne per cm2. When the logarithm of E was taken on the abscissa, the histogram of 88 preparations showed approximately a normal distribution. Based on the calculation of a damped oscillation after quick release, the values of the viscosity coefficient of muscles were obtained, which were the order of 102(g/cm-sec). Plasticity increases with the time and magnitude of the previous loading, but it is removed completely by electrical stimulation.

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