title: Inversion and eversion strengths in the weightbearing ankle of young women. Effects of plantar flexion and basketball shoe height.
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 degrees and 32 degrees of ankle plantar flexion were 24.1 (7.6) and 24.1 (8.1) N x m, respectively, while the corresponding values for maximum inversion moments resisted were 14.7 (6.8) and 17.4 (6.4) N x m, respectively. Both shoe height and ankle plantar flexion affected the overall inversion moment resisted by 17% (P = 0.03) at 0 degrees of ankle plantar flexion to 11.9% (P = 0.003) at 32 degrees 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 x 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 x height.
authors: MedSport, Section of Orthopedic Surgery, Ann Arbor, Michigan, USA.
authors: R A
authors: RA
authors: Ottaviani
authors: J A
authors: JA
authors: Ashton-Miller
authors: E M
authors: EM
authors: Wojtys
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D016512:Ankle Injuries / Q000517:prevention & control*; D000843:Ankle Joint / Q000502:physiology*; D001265:Athletic Injuries / Q000517:prevention & control; D001490:Basketball / Q000293:injuries; D001824:Body Constitution; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007537:Isometric Contraction; D016014:Linear Models; D018482:Muscle, Skeletal / Q000502:physiology*; D016059:Range of Motion, Articular; D012737:Sex Factors; D012775:Shoes; D016474:Weight-Bearing / Q000502:physiology