Correlation of bilateral and ipsilateral strength ratios with balance in female taekwondo athletes

Ali Kerim Yilmaz; Coskun Yilmaz; Muhammet Hakan Mayda; Emre Karaduman; Serhat Erail; Özgür Bostanci; Menderes Kabadayi

doi:10.18002/rama.v16i2.6486

Authors

Ali Kerim Yilmaz Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences http://orcid.org/0000-0002-0046-6711
Coskun Yilmaz Gümüshane Üniversitesi, Kelkit Aydin Dogan Vocational School, Gümüshane http://orcid.org/0000-0002-2826-1566
Muhammet Hakan Mayda Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences http://orcid.org/0000-0002-7062-3284
Emre Karaduman Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences http://orcid.org/0000-0002-7962-315X
Serhat Erail Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences http://orcid.org/0000-0001-5413-2656
Özgür Bostanci Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences http://orcid.org/0000-0002-7952-1014
Menderes Kabadayi Ondokuz Mayis University, Faculty of Yasar Dogu Sport Sciences

DOI:

https://doi.org/10.18002/rama.v16i2.6486

Keywords:

Combat sports, martial arts, taekwondo, lateral asymmetry, isokinetic knee strength, balance

Agencies:

The authors received no funding for this work.

Abstract

This study aimed to analyze preferred leg (PLs) and non-preferred leg (NPLs) isokinetic knee strength, lateral asymmetry ratios and to examine their correlation with static balance. Sixteen female taekwondo (TKD) athletes voluntarily participated in the study. Knee isokinetic extension (Ex) and flexion (Flx) strength were measured in concentric / concentric (Con / Con) contractions at angular velocities of 60°/s, 180°/s, and 240°/s. Ipsilateral hamstring / quadriceps (H/Q) and bilateral (H/H and Q /Q) ratios were calculated. Static balances were determined by taking the center of body pressure in X (COPX) and Y (COPY) axis. Paired sample t-test and Pearson correlation tests were used in statistical analysis. When the isokinetic knee strength was examined, it was found that 60°/s angular velocity parameter was significantly different in Flx phase while 180°/s and 240°/s angular velocities were found to be significantly different in Ex phase in favor of PLs. There was no significance in bilateral and ipsilateral strength ratios of all angular velocities. There was a significant correlation between 240°/s HQ and COPX in terms of ipsilateral asymmetry ratios whereas a significant correlation was found between 60°/s HH and COPX in terms of bilateral asymmetry ratios. It was found that there were differences in strength between PL and NPLs, but no asymmetry was observed. There was no high level of correlation between lateral asymmetry ratios and balance in female TKD practitioners.

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