Young, W. B., Wilson, G. B., & Byrne, C. A. (1999). A comparison of drop jump training methods: Effects on leg extensor strength qualities and jumping performance. International Journal of Sports Medicine, 20, 295-303.

Males were divided into three groups: a control group (N = 9), a maximum rebound height group (DJ; N = 13), and a maximum rebound and minimum ground contract group (DJCT; N =13). The drop jump training consisted of 72-90 drop jumps per week for six weeks from successively greater heights of 30, 45, 60, and 75 cm. Vertical jumping performance and leg extensor qualities were measured before and after training.

There was a 20% gain in reactive strength for the DJCT group that was significantly greater than for the other two groups. However, that difference did not translate into vertical jump performance. The DJ group did not demonstrate a training effect. No changes in extensor muscle qualities were exhibited in any group.

Implication. Drop jump training of this volume and/or intensity did not result in an improvement in vertical jump height or were there changes in leg extensor muscle qualities.

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