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Updated: Jun 13, 2026
Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials
Published on: April 27, 2021
A preliminary investigation of motor evoked potential abnormalities following sport-related concussion
Scott C Livingston1, Ethan N Saliba, Howard P Goodkin
1Division of Physical Therapy, University of Kentucky, Lexington, KY 40536-0200, USA. scott.livingston@uky.edu
Background:
Assessment of concussion is primarily based on self-reported symptoms, neurological examination and neuropsychological testing. The neurophysiologic sequelae and the integrity of the corticomotor pathways could be obtained by evaluating motor evoked potentials (MEPs).
Objectives:
To compare MEPs obtained through transcranial magnetic stimulation (TMS) in acutely concussed and non-concussed collegiate athletes.
Methods:
Eighteen collegiate athletes (12 males, six females, aged 20.4 +/- 1.3 years) including nine subjects with acute concussion (
Results:
Ulnar MEP amplitudes were significantly different between post-concussion days 3 and 5 (F(3,48) = 3.13, p = 0.041) with smaller amplitudes recorded on day 3 (0.28 +/- 0.10 ms m(-1)). Median MEP latencies were significantly longer (F(3,48) = 4.53, p = 0.023) 10 days post-concussion (27.1 +/- 1.4 ms m(-1)) compared to day 1 (25.7 +/- 1.5 ms m(-1)). No significant differences for motor thresholds or CMCTs were observed (p > 0.05).
Conclusion:
MEP abnormalities among acutely concussed collegiate athletes provide direct electrophysiologic evidence for the immediate effects of concussion.
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