Abstract
Exercise-induced muscle damage causes a disproportionally larger drop in maximal force when measured at short versus optimal or long muscle lengths, resulting in a shift of the length (angle)-force relationship towards longer lengths. However, little attention has been given to the potential effect of this shift on the rate of force development (RFD) and isotonic function at different muscle lengths. This study examined RFD at various elbow angles and kinematic variables at two different ranges of elbow flexion, so as to include mainly the ascending (S condition) or the descending limb (L condition) of the angle-force curve, following eccentric exercise. Seven male volunteers performed an eccentric exercise protocol with the elbow flexors, which caused significant changes in indicators of muscle damage (P < 0.05–0.001). Optimum angle for force generation was significantly shifted towards longer elbow flexors lengths post exercise (P < 0.05–0.01). RFD was significantly decreased at all the angles tested but no differences were revealed between angles (P < 0.05–0.001). The kinematic variables measured were also significantly impaired following eccentric damage (P < 0.05–0.001). Maximal isotonic force showed a greater impairment in the S condition, however no significant differences between the S and L condition were found in maximal angular velocity (MAV) and time, angle and isotonic force needed to achieve MAV. These results suggest that impairment of RFD following muscle damage is not muscle-length dependent and the rightward shift of the angle-force curve is not the determinant of the decline in either RFD or the isotonic performance at the different ranges of the elbow flexion movement.
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Philippou, A., Koutsilieris, M. & Maridaki, M. Changes in kinematic variables at various muscle lengths of human elbow flexors following eccentric exercise. J Muscle Res Cell Motil 33, 167–175 (2012). https://doi.org/10.1007/s10974-012-9314-9
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DOI: https://doi.org/10.1007/s10974-012-9314-9