This study investigated the relationship between vertical stiffness in the sub-maximal and maximal bilateral hopping test and middle-distance running performance in young middle distance runners. The longer distance running performance was more correlated with normalized vertical stiffness in sub-maximal hopping, Wile the sprint performance was statistically linked to vertical stiffness in maximal hopping. Vertical stiffness measured in combination of the sub-maximal and maximal hopping tests might be utilized as a useful indicator for middle-distance running performance. Accordingly, incorporating plyometric exercises, especially involving vertical motions, might benefit middle-distance running performance.
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