Sex Difference in Strength and Size Ratios between Reciprocal Muscle Groups in the Lower Leg

R. Akagi; Y. Tohdoh; H. Takahashi

doi:10.1055/s-0032-1327654

International Journal of Sports Medicine, Table of Contents

Int J Sports Med 2013; 34(05): 449-452
DOI: 10.1055/s-0032-1327654

Orthopedics & Biomechanics

Sex Difference in Strength and Size Ratios between Reciprocal Muscle Groups in the Lower Leg

Authors

R. Akagi

¹Department of Sports Sciences, Japan Institute of Sports Sciences, Kita-ku, Tokio, Japan
Y. Tohdoh

²Department of Sports Medicine, Japan Institute of Sports Sciences, Kita-ku, Tokyo, Japan
H. Takahashi

²Department of Sports Medicine, Japan Institute of Sports Sciences, Kita-ku, Tokyo, Japan

Abstract

This study compared strength and size of reciprocal muscle groups in the lower leg between sexes. 20 young men and 14 young women volunteered as subjects. Joint torques developed during isometric maximal voluntary plantar flexion (TQ_PF) and dorsiflexion (TQ_DF) were measured using a dynamometer. Muscle volumes of plantar flexors (MV_PF) and dorsiflexors (MV_DF) were determined by magnetic resonance imaging. In each of the muscle groups, joint torque was significantly correlated with muscle volume in young men and women (r=0.610–0.848) and the y-intercept of the regression line between them was not significantly different from zero. Based on these observations, the dependencies of muscle strength ratio on muscle size ratio between the plantar flexors and dorsiflexors were investigated using joint torque and muscle volume. The correlations between the MV_PF per MV_DF and the TQ_PF per TQ_DF were significant both in young men (r=0.608) and women (r=0.773), suggesting that strength ratio is strongly affected by size ratio between the plantar flexors and dorsiflexors in young men and women.

Key words

joint torque - muscle volume - plantar flexors - dorsiflexors

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References

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