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KMID : 1206220200270010009
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Journal of Korean Academy of Physical Therapy Science
2020 Volume.27 No. 1 p.9 ~ p.17
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Sex differences in repeatability of measurement for hamstring strength during maximal voluntary contractions
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Lim Woo-Taek
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Abstract
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Background: This study aimed to examine the repeatability of hamstring strength during maximal voluntary contractions (MVCs) and to examine the sex difference.
Design: Quasi-experiment design.
Methods: The study recruited 23 healthy young individuals as participants. Hamstring flexibility was measured before and after MVCs by active knee extension test. Five trials of MVCs were performed, and hip extension forces were measured using a strain gauge during MVCs. Repeatability was confirmed by intraclass correlation coefficient (ICC) and coefficient of variation, and the difference between male and female participants was confirmed by independent samples t-test.
Results: The forces measured during MVCs were significantly different between men and women over five trials. We observed the minimum and maximum force production at the first and fifth trial of MVCs in both men and women. Excellent to moderate reliability of the hamstring strength during MVCs was found in men (ICC range, 0.70?0.98) and women (ICC range, 0.66?0.90). There was no significant difference in hamstring flexibility between men and women.
Conclusion: In clinical settings, we recommend excluding the first trial of MVCs in both men and women. Additionally, performing at least three trials of MVCs would be useful to improve the reliability of the baseline measures in women.
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KEYWORD
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Flexibility, Hamstring muscles, Maximum voluntary contraction, Repeatability
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