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[Associations between trunk muscle strength and judo-specific pulling performances in judo athletes]

Norman Helm^1,2, Olaf Prieske², Thomas Muehlbauer^2,3

¹Olympic Testing and Training Center Brandenburg.

Sportverletzung Sportschaden : Organ Der Gesellschaft Fur Orthopadisch-Traumatologische Sportmedizin

|December 21, 2018

Abstract

Background:

Good trunk stability is an important prerequisite for the mobility of the upper and lower limbs during sport-specific movements. Therefore, trunk muscle strength may represent an important performance determinant for judo-specific movements. This study aimed at evaluating statistical correlations between trunk muscle strength and kinetic parameters during judo-specific pulling movements in judo players.

Method:

Twenty-one male sub-elite judo players aged 22 ± 4 years with a mean training volume of 15 ± 4 hours per week participated in this study. Peak isokinetic torque (PIT) of the trunk flexors (PIT_Flex), extensors (PIT_Ex) and rotators (PIT_Rot) was tested using an isokinetic dynamometer (IsoMed 2000). In addition, two kinetic parameters (mechanical work [W], maximal force [F_max]) were analysed using the judo-specific measurement and information system JERGo^©. For this purpose, athletes were asked to do their judo-specific pulling movements while standing and with a dynamic change of position (i. e. Morote-seoi-nage).

Results:

Regarding pulling movements while standing, significant correlations (0.62 ≤ r _P ≤ 0.72) were found between isokinetic tests (PIT_Flex, PIT_Ex, PIT_Rot) and mechanical work during judo-specific movement. Further, significant correlations (0.59 ≤ r _P ≤ 0.65) were detected between isokinetic tests (PIT_Ex, PIT_Rot) and judo-specific pulling movements (F_max). Regarding pulling movements with a change of position, significant correlations (0.47 ≤ r _P ≤ 0.88) were observed between isokinetics (PIT_Flex, PIT_Ex, PIT_Rot) and the kinetic pulling parameters (W, F_max), irrespective of the examined arm. No significant differences in magnitude of correlation coefficients were found between PIT of the trunk flexors, extensors, and rotators and judo-specific movements. Further, the regression analysis indicated that PIT of the trunk extensors is the single best predictor for mechanical work during pulling movements while standing (46.9 %). Trunk rotator PIT is the single best predictor for mechanical work during pulling movements with a change of position (69.4 %).

Conclusions:

Findings from this study indicate that trunk muscle strength, particularly trunk rotator PIT is associated with kinetic pulling variables during pulling movements with a change of position. This implies that the development of trunk rotator strength could have an impact on pulling movements with a change of position (i. e. Morote-seoi-nage) in judo athletes.

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