Figure 14.

Real-time data comparing consecutive frame step-size d (equation (2.4)) for active and relaxed muscle. These data are a subset of the datasets providing the step-size histogram residual in figure 13. The active muscle has larger average d (1.6 versus 0.5 nm) and dispersion (1.0 versus 0.5 nm s.d.). The oscillation of d from active isometric muscle suggests a cycle time of approximately 4 s. If the sampling rate is too low (likely) then the observed oscillation is an alias for a higher-frequency oscillation.