Transverse Strains in Muscle Fascicles during Voluntary Contraction: A 2D Frequency Decomposition of B-Mode Ultrasound Images

Figure 2

Muscle Structural Data for the Lateral Gastrocnemius during One Set of Ankle Plantarflexions. The first column shows the parameters changing over five contraction cycles. The middle and right columns show these data expressed as a percentage of the contraction cycle and show individual points as well as the smooth model calculated from Fourier series. Parameters determined from manual digitization are shown in red, and parameters determined following the discrete Fourier transform are shown in blue. was calculated with .