The Effect of Stretch on the Electrical Constants of Muscle Fibre Membrane

The membrane constants of muscle fibres of toads, in normal and stretched states, were measured by square pulse analysis. A tendency for both Cm and 1/Rm to increase by the application of stretch was observed, but the difference of these constants between relaxed and stretched states is so small that it cannot be considered significant by taking into consideration various errors involved in measuring these constants. However, other kinds of experiments on muscle fibres would support the conclusion that Cm and 1/Rm increase, although this increase is only about 14%.