The assessment of sport-related concussions is hindered by lack of
a neuroanatomic or neurophysiologic assessment of injury severity
and recovery timeframe. We set out to determine if motor evoked
potentials are different between acutely concussed and
non-concussed collegiate athletes and determine if any
relationships exist between MEP changes, self-reported symptoms and
neurocognitive deficits. MEP thresholds, latencies, and amplitudes,
scores on a self-reported symptoms checklist; and scores from a
neurocognitive test battery were evaluated in 18 collegiate
athletes (9 concussed, 9 controls). The observed MEP changes
provide electrophysiological evidence for the acute effects of
cerebral concussion in an athletic population. Alterations in
neurochemical and neurometabolic processes following concussions
may explain these abnormal MEPs, post-concussive symptoms, and
deficits in neurocognitive function.
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