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The purpose of this study was to find differences of jumping performances within individual and to identify the influencing factors in these differences. 20 male subjects performed 6 maximal vertical jumps. The best(GP) & worst(BP) performance of each subject based on their jump height were compared in further analysis. There was a significant difference of approx. 10% in the jump height between GP and BP, which resulted from height of COM and vertical velocity at the instant of take-off. We could observe a significantly higher ankle moment in the GB more than the BP but no significant differences for the knee and hip joint. Also the maximum power of ankle joints in the GP were significantly higher than that in the BP. According to the results, the mechanical output of knee and hip joint are not as influential as that of ankle joint for difference of performance within individual. In conclusion, the results showed that mechanical output of the ankle joint could be more influential factors on the performances within individual although the knee and hip joint play an important role in the vertical jump. We therefore propose that more emphasis should be placed on the potentiation of the ankle joint for the training of the maximum vertical jump.

Biomechanical Comparison of Good and Bad Performances within Individual in Maximum Vertical Jump