Navicular drop before and after fatigue of the ankle invertor muscles

Fredrick Gardin, David Middlemas, Jennifer L. Williams, Steven Leigh, Robert Horn, Monique Mokha

Research output: Contribution to journalArticle


Context: Navicular drop is widely believed to be an indicator of elevated susceptibility to pronation-related injuries, which may be increased by fatigue in the muscles that dynamically support the medial longitudinal arch. Objective: The purpose of this study was to evaluate navicular drop before and after fatigue of the ankle invertor muscles among individuals with different foot types. Participants: 20 male and 16 female recreationally active, college-age volunteers (20.03 ± 1.48 years of age). Methods: Navicular drop was measured before and after inducing fatigue in the ankle invertor muscles. Participants' foot types were classified as high-arch, neutral, or low-arch. Results: There was no interaction between foot type and trial, and no main effect for trial. A main effect for foot type was significant (p =.001). Intra-class correlation coefficients for prefatigue and postfatigue measurements indicated good internal consistency. Conclusion: Our findings failed to provide any evidence to support the existence of a relationship between ankle invertor muscle fatigue and static measurements of change in navicular height from a sitting to standing position.

Original languageEnglish
Pages (from-to)36-39
Number of pages4
JournalInternational Journal of Athletic Therapy and Training
Issue number6
Publication statusPublished - Nov 2013



  • Foot pronation
  • Muscular fatigue
  • Posterior tibialis muscle

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