Age‐related differences in vastus lateralis fascicle behavior during fast accelerative leg‐extension movements

Leg‐extensor rate of power development (RPD) decreases during aging. This study aimed to identify the underlying mechanism of the age‐related decline in RPD during a fast acceleration in terms of in vivo vastus lateralis (VL) fascicle shortening behavior. Thirty‐nine men aged between 25 and 69 years performed three maximal isokinetic leg‐extensor tests with a fixed initial acceleration of 45° knee extension in 150 ms until 340°/s knee angular...