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The Countermovement Jump Mechanics of Mixed Martial Arts Competitors.

Published on Jan 16, 2020in Journal of Strength and Conditioning Research3.017
· DOI :10.1519/JSC.0000000000003508
Lachlan P. James8
Estimated H-index: 8
,
Mark J. Connick8
Estimated H-index: 8
+ 2 AuthorsEmma M. Beckman10
Estimated H-index: 10
Abstract
The countermovement jump mechanics of mixed martial arts competitors. J Strength Cond Res XX(X): 000-000, 2020-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.
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