title: Relationships between self-reported ankle function and modulation of Hoffmann reflex in patients with chronic ankle instability.
abstract: 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).
  
  
  METHODS
  Observational.
  
  
  METHODS
  Laboratory.
  
  
  METHODS
  Thirty-one young adults with CAI (19 males, 12 females) participated.
  
  
  METHODS
  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.
authors.affiliation: Department of Kinesiology and Sport Sciences, University of Miami, 1507 Levante Avenue, Coral Gables, FL 33146, USA. Electronic address: kmk154@miami.edu.
authors.forename: Kyung-Min
authors.initials: KM
authors.lastname: Kim
authors.affiliation: University of Virginia, 210 Emmet St. South, PO Box 400407, Charlottesville, VA 22904, USA. Electronic address: jmh3zf@virginia.edu.
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Hart
authors.affiliation: University of Virginia, 210 Emmet St. South, PO Box 400407, Charlottesville, VA 22904, USA. Electronic address: saf8u@virginia.edu.
authors.forename: Susan A
authors.initials: SA
authors.lastname: Saliba
authors.affiliation: University of Virginia, 210 Emmet St. South, PO Box 400407, Charlottesville, VA 22904, USA. Electronic address: jhertel@virginia.edu.
authors.forename: Jay
authors.initials: J
authors.lastname: Hertel
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000842:Ankle; D016512:Ankle Injuries / Q000150:complications / Q000503:physiopathology*; D000843:Ankle Joint / Q000503:physiopathology*; D005260:Female; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000503:physiopathology*; D008297:Male; D018482:Muscle, Skeletal / Q000503:physiopathology*; D011187:Posture / Q000502:physiology; D057566:Self Report; D013177:Sports; D011795:Surveys and Questionnaires
keywords: Ankle dysfunction; Fibularis longus; Soleus