Inversion and Eversion Strengths in the Weightbearing Ankle of Young Women

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Abstract
Maximum isometric ankle inversion and eversion muscle strengths were measured under full unipedal weightbearing in 20 healthy young adult women. When the women wore a low-top shoe, the mean (standard deviation) maximum external eversion moments resisted with the foot in 0° and 32° of ankle plantar flexion were 24.1 (7.6) and 24.1 (8.1) N m, respectively, while the corresponding values for maximum inversion moments resisted were 14.7 (6.8) and 17.4 (6.4) N m, respectively. Both shoe height and ankle plantar flexion affected the overall inversion moment resisted by 17% (P=0.03) at 0° of ankle plantar flexion to 11.9% (P=0.003) at 32° of ankle plantar flexion. However, neither shoe height nor ankle plantar flexion significantly affected the maximum eversion moment resisted. Although eversion muscle strength of the young women averaged 39% less than the corresponding value found in young men, the sex difference was not significant when ankle strengths were normalized by body size (body weight × height). Thus, when data from healthy young men and women were averaged, eversion and inversion strengths averaged 1.6% and 2.7%, respectively, of body weight × height.

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