Linear and Non-Linear Measurements of Postural Control Recovery Following Concussion

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Abstract or Description

Introduction: Impaired postural control is a cardinal symptom of concussion and the Balance Error Scoring System (BESS) suggests recovery within 3-5 days. However, instrumented measures of postural control have suggested persistent deficits.

Purpose: To evaluate differences in linear (95% area, mean velocity) and non-linear (approximate entropy) measurements in concussed individuals throughout the recovery process compared to healthy controls

Methods: 18 collegiate athletes with concussion (age: 19.0±1.4 years, height: 175.9±11.4 cm, mass: 82.5±23.8 kg) and 10 healthy individuals (age: 22.4±2.7 years, height: 175.7±11.9 cm, mass: 81.1±21.3 kg) were tested. Post-concussion participants were tested on three occasions 1) acutely (24-48 hours following injury), 2) RTP day (full practice/game), and 3) 30 days following injury. Participants completed three trials of a quiet stance (eyes open, firm surface) on their dominant leg for 20 seconds. Performance at each time point was compared to healthy values using a 2x3 ANOVA for each dependent variable.

Results: There was a significant main effect for group in both 95% area (p

Conclusion: Linear CoP measurements, especially 95% area, may be strong indicators of postural control deficits acutely post-concussion. However, at RTP non-linear measures may better at identifying lingering impairments. Lingering deficits up to 30 days following injury may become apparent when using these measurements.


American College of Sports Medicine Annual Conference (ACSM)


San Diego, CA