Abstract
Summary Objectives The purpose of this investigation was to examine the effect of different loading conditions (0%, 5%, 10%, and 20% of body mass) on leg stiffness during hopping performed at different frequencies (1.8 Hz, 2.2 Hz, 2.6 Hz and 3.0 Hz). Equipment and methods For this study, 13 male subjects performed a hopping task under different loading (added through weighted vest) and frequency conditions. Contact and flight times were recorded to compute leg stiffness using the sine-wave method. Results The results from present study showed that hopping frequency had a significant effect on leg stiffness. When hopping frequency was increased, the stiffness of the legs significantly increased. However, the data indicates that only loading conditions larger than 10% of the body mass significantly affect leg stiffness when subjects performed the hopping task at 3.0 Hz. Conclusion The control of the hopping frequency as well as the amount of added load using weighted vests should be taken into account by coaches and trainers when they are planning workouts to achieve specific acute effects on leg stiffness.
Published Version
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