Relationships between self-reported ankle function and modulation of Hoffmann reflex in patients with chronic ankle instability

Phys Ther Sport. 2016 Jan;17:63-8. doi: 10.1016/j.ptsp.2015.05.003. Epub 2015 May 27.


Objective: To examine relationships between self-reported ankle function and Hoffmann (H) reflex modulation during changes in body positions in patients with chronic ankle instability (CAI).

Design: Observational.

Setting: Laboratory.

Participants: Thirty-one young adults with CAI (19 males, 12 females) participated.

Main outcome measures: There were two subscales of Foot and Ankle Ability Measure (FAAM) to quantify self-reported ankle function during activities of daily living (ADL) and sports activities. Maximum H-reflexes (H-max) and motor waves (M-max) from soleus and fibularis longus were recorded while participants lied prone and stood in bipedal and unipedal stances. For each muscle, percent change scores in Hmax:Mmax ratios were calculated between each pair of positions: prone-to-bipedal, bipedal-to-unipedal, and prone-to-unipedal, and used as a measure of H-reflex modulation. Pearson correlation coefficients were calculated between FAAM and H-reflex modulation measures.

Results: There were significant correlations between: (1) FAAM-ADL and soleus prone-to-unipedal modulation (r = 0.384, p = 0.04), (2) FAAM-Sport and soleus prone-to-unipedal modulation (r = 0.505, p = 0.005), (3) FAAM-Sport and fibular bipedal-to-unipedal modulation (r = 0.377, p = 0.05), and (4) FAAM-Sport and fibular prone-to-unipedal modulation (r = 0.396, p = 0.04).

Conclusions: CAI patients presented moderate, positive relationships between self-reported ankle function and H-reflex modulation during changes in body positions.

Keywords: Ankle dysfunction; Fibularis longus; Soleus.

Publication types

  • Observational Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Activities of Daily Living
  • Adult
  • Ankle
  • Ankle Injuries / complications
  • Ankle Injuries / physiopathology*
  • Ankle Joint / physiopathology*
  • Female
  • H-Reflex / physiology*
  • Humans
  • Joint Instability / etiology
  • Joint Instability / physiopathology*
  • Male
  • Muscle, Skeletal / physiopathology*
  • Posture / physiology
  • Self Report*
  • Sports*
  • Surveys and Questionnaires