Determining Bilateral Strength Imbalances in Youth Basketball Athletes

Christopher Thomas; Paul Comfort; Thomas Dos’Santos; Paul A. Jones

doi:10.1055/s-0043-112340

International Journal of Sports Medicine, Table of Contents

Int J Sports Med 2017; 38(09): 683-690
DOI: 10.1055/s-0043-112340

Training & Testing

Determining Bilateral Strength Imbalances in Youth Basketball Athletes

Authors

Christopher Thomas

¹Directorate of Sport, Exercise and Physiotherapy, University of Salford, Manchester, United Kingdom of Great Britain and Northern Ireland
Paul Comfort

¹Directorate of Sport, Exercise and Physiotherapy, University of Salford, Manchester, United Kingdom of Great Britain and Northern Ireland
Thomas Dos’Santos

¹Directorate of Sport, Exercise and Physiotherapy, University of Salford, Manchester, United Kingdom of Great Britain and Northern Ireland
Paul A. Jones

¹Directorate of Sport, Exercise and Physiotherapy, University of Salford, Manchester, United Kingdom of Great Britain and Northern Ireland

Abstract

The aims of this study were: 1) to compare the strongest (D) and weakest (ND) limbs in determining muscle strength asymmetry (MSA) ratios among various muscle strength qualities and 2) to determine the relationships among various muscle strength qualities. 17 youth male basketball athletes (age=17.5±0.8 years; height=187.1±9.4 cm; body mass=81.4±10.1 kg) participated in this study. Knee flexor and extensor strength at 60°·s⁻¹ was assessed for both limbs with the use of isokinetic dynamometry. Other tests involved single-leg hop (SLH), countermovement jump (CMJ) and isometric mid-thigh pull (IMTP). Statistically significant differences (p<0.05; d=0.40-0.98) were found between D and ND limbs for all strength measures. Imbalance ratio of the IMTP was significantly related to those of SLH (r=0.75, p=0.01) whereas no significant relationships between D:ND ratios were found from all other tests. Percentage agreements of MSA ranged from 64.7–88.2% between muscle strength qualities. The findings provide support for the use of field tests to detect lower-limb strength imbalances. Future research should examine the effect of different asymmetry thresholds on percentage agreements to diagnose MSA and determine its relationship to athletic performance.

Key words

asymmetry - isokinetics - hop tests - countermovement jump - mid-thigh pull

Full Text

References

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