title: Lower extremity muscle activation in patients with or without chronic ankle instability during walking.
abstract: BACKGROUND
  Ankle sprains are among the most common musculoskeletal injuries, and many individuals with ankle sprains develop chronic ankle instability (CAI). Individuals with CAI exhibit proprioceptive and postural-control deficits, as well as altered osteokinematics, during gait. Neuromuscular activity is theorized to play a pivotal role in CAI, but deficits during walking are unclear.
  
  
  OBJECTIVE
  To compare motor-recruitment patterns as demonstrated by surface electromyography amplitudes between participants with CAI and healthy control participants during walking.
  
  
  METHODS
  Descriptive laboratory study.
  
  
  METHODS
  Laboratory.
  
  
  METHODS
  Fifteen adults with CAI (5 men, 10 women; age = 23 ± 4.2 years, height = 173 ± 10.8 cm, mass = 72.4 ± 14 kg) and 15 matched healthy control adults (5 men, 10 women; age = 22.9 ± 3.4 years, height = 173 ± 9.4 cm, mass = 70.8 ± 18 kg).
  
  
  METHODS
  Participants walked shod on a treadmill while surface electromyography signals were recorded from the anterior tibialis, peroneus longus, lateral gastrocnemius, rectus femoris, biceps femoris, and gluteus medius muscles.
  
  
  METHODS
  Preinitial contact amplitude, postinitial contact amplitude, time of activation relative to initial contact, and percentage of activation time across the stride cycle were calculated for each muscle.
  
  
  RESULTS
  Time of activation for all muscles tested occurred earlier in the CAI group than in the control group. The peroneus longus was activated for a longer duration across the entire stride cycle in the CAI group (36.0% ± 10.3%) than the control group (23.3% ± 22.2%; P = .05). No differences were noted between groups for measures of electromyographic amplitude at either preinitial or postinitial contact (P > .05).
  
  
  CONCLUSIONS
  We identified differences between the CAI and control groups in the timing of muscle activation relative to heel strike in multiple lower extremity muscles and in the percentage of activation time across the entire stride cycle in the peroneus longus muscle. Individuals with CAI demonstrated neuromuscular-activation strategies throughout the lower extremity that were different from those of healthy control participants. Targeted therapeutic interventions for CAI may need to be focused on restoring normal neuromuscular function during gait.
authors.affiliation: Department of Kinesiology, The University of Virginia, Charlottesville.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Feger
authors.forename: Luke
authors.initials: L
authors.lastname: Donovan
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Hart
authors.forename: Jay
authors.initials: J
authors.lastname: Hertel
mesh_terms: D016512:Ankle Injuries / Q000150:complications / Q000503:physiopathology*; D000843:Ankle Joint / Q000503:physiopathology; D016022:Case-Control Studies; D002908:Chronic Disease; D004576:Electromyography; D005080:Exercise Test; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000503:physiopathology*; D035002:Lower Extremity / Q000503:physiopathology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D012775:Shoes; D016138:Walking / Q000502:physiology*; D055815:Young Adult
keywords: ankle sprains; gait; neuromuscular control; peroneus longus muscle