The Architecture and Strength of Peroneal Musculature Differs Between Sexes

Document Type

Student Presentation

Presentation Date



College of Health Sciences



Faculty Sponsor

Tyler Brown


Deficits in peroneal musculature that lead to functional ankle instability (FAI) may differ between sexes. This study determined if architecture and strength of the peroneal musculature differed between FAI participants and sexes. Twenty-four (13 females; 11 males) participants (ht: 1.71 ± .07 m; wt: 71.98 ± 11.37 kg) had geometric architecture and strength of peroneals quantified. Participants were defined as FAI (n = 9) or CON (n = 15) based on ankle instability instrument. Peroneal architecture (CSA, muscle and fascicle length, pennation angle, stiffness) were quantified using ultrasound (Siemens Acuson S2000), while strength (dorsiflexion, plantarflexion, eversion) was recorded on an isokinetic dynamometer (Biodex System 2). Each muscle parameter was submitted to ANOVA and determine to main effect and interaction of group and sex. Females CON participants exhibited a shorter peroneal than FAI (p = 0.005); whereas, males exhibited no difference in muscle length between groups (p = 0.749). Additionally, males exhibited longer (ML: p = 0.009), larger (CSA: p < 0.001) and stronger (dorsiflexion: p < 0.001; plantarflexion: p = 0.001; eversion: p = 0.035) peroneals compared to females. Future study is warranted to determine if differences in the peroneal musculature lead to greater incidence of FAI in females. This project was supported by Institutional Development Awards (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under Grants #P20GM103408 and P20GM109095. We also acknowledge support from The Biomolecular Research Center at Boise State with funding from the National Science Foundation, Grants # 0619793 and #0923535; the MJ Murdock Charitable Trust; and the Idaho State Board of Education.

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