ArticlePeerJ2026
Biomechanical determinants of ground contact time and jump height during drop jumps in male athletes.
Article in PeerJ, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
Background: Drop jump (DJ) performance is underpinned by a complex interplay of biomechanical factors occurring during the eccentric and concentric phases. This study aimed to identify the biomechanical determinants of DJ performance using partial least squares (PLS) regression analysis. Methods: Forty-three male collegiate athletes (mean age, height, and mass = 20.1 ± 1.3 years, 1.74 ± 0.07 m, 79.0 ± 23.4 kg) performed DJs from a 0.3-m box while three-dimensional kinematics and ground reaction forces (GRFs) were recorded. Ground contact time, jump height, and reactive strength index (RSI) were analyzed as outcome measures. Results: PLS regression models demonstrated strong explanatory power for each outcome ( Conclusions: These findings indicate that larger ROM and greater concentric impulse contribute to jump height but at the cost of longer ground contact, whereas shorter ground contact is promoted by high eccentric vertical ground reaction force and near-neutral hip posture, which can trade off against height.
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