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Category

Running & Jumping

Document Type

Paper

Abstract

The purpose of this study was to clarify the differences in the relationships between lower-limb joint kinetics (i.e., torque, power, and work) and jump height at the intra- and inter- individual levels in single-leg countermovement jumps (CMJs). Forty male collegiate athletes (age, 20.6 ± 1.7 years; mass, 67.5 ± 5.8 kg; height,172.0 ± 6.5 cm) performed 10 maximal effort single-leg CMJs. Whole-body motion and ground reaction force data were collected to calculate lower-limb joint kinetics. Multilevel correlation analysis (MLC) and hierarchical linear modeling (HLM) were used to examine the intra- and inter-individual relationships between lower-limb joint kinetics and jump height. The results showed that intra-individual correlation coefficients were consistently lower than inter-individual correlation coefficients in MLC. HLM revealed that only ankle torque and positive ankle work had significant fixed effects (β = 0.054, β = 0.043), and positive hip power, positive knee work, and positive hip work had significant random effects (all: < 0.001). These findings indicated that greater torque and positive work at the ankle joint were consistently associated with greater jump height at the intra- and inter-individual levels, whereas such relationships were not observed for the knee and hip joints due to individual variability.

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