Title

The countermovement jump mechanics of mixed martial arts competitors

Document Type

Journal Article

Publication Title

Journal of Strength and Conditioning Research

Publisher

NLM (Medline)

School

Center for Sport and Exercise Science Research

Comments

James, L. P., Connick, M., Haff, G. G., Kelly, V. G., & Beckman, E. M. (2020). The Countermovement Jump Mechanics of Mixed Martial Arts Competitors. The Journal of Strength & Conditioning Research, 34(4), 982-987. https://doi.org/10.1519/JSC.0000000000003508

Abstract

Gross countermovement jump (CMJ) performance measures are greater in higher-level mixed martial arts (MMA) competitors than lower-level (LL) competitors. Differences in CMJ kinetics and kinematics throughout the action may explain those CMJ performance differences, but this remains to be investigated. After warm-up and familiarization, 27 MMA competitors (divided into 2 groups based on competitive standard; higher level [HL]: n = 14 and LL: n = 13) completed 3 maximal effort CMJs. Power, force, velocity, displacement-time waveforms and eccentric phase displacement, eccentric time, eccentric impulse, and the modified reactive strength index (RSImod) were compared between groups using statistical parametric mapping procedures and independent t-tests. Power (between 65 and 71% of the power-time curve) was greater in the HL than that of the LL group (p = 0.01) despite no differences in eccentric displacement (p = 0.50) or movement time (p = 0.17) between groups. The HL group demonstrated a greater RSImod (p = 0.05) alongside a reduced eccentric time (p = 0.02) and eccentric impulse (p = 0.02). These findings suggest that timing and control of lower-body force production contributed to between-group differences in CMJ performance among MMA competitors.

DOI

10.1519/JSC.0000000000003508

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