Abstract
Understanding the neuropathological underpinnings of sport-related concussion are critical for diagnosis, prognosis, and remediation. Although electro-encephalographic (EEG) methods have proven invaluable for understanding psycho-affective pathologies in various clinical conditions, they have not been used to understand the psycho-affective outcomes of concussive injuries. Accordingly, we evaluated the relation of electroencephalographic (EEG) power in collegiate athletes to psycho-affective measures. We predicted that athletes with a history of concussion would exhibit alterations in frontal EEG asymmetries indicative of increased depression, anxiety and more general mood disturbance. During this cross-sectional study, resting EEG and measures of mood and affect, including the Beck Depression Inventory-II (BDI-II) and Profile of Mood States (POMS) were collected in 81 young-adult male athletes (52 concussion history; 29 controls). All athletes with a history of concussion (9+ months from injury) reported to be symptom free, and all participants were actively taking part in their sport at the time of testing. Compared to control athletes, the athletes with a history of concussion exhibited alterations in frontal-alpha and frontal-beta asymmetry (p’s < .05). Correlational analyses revealed that alterations in frontal-alpha asymmetry were related to self-reported depression and anxiety, and alterations in beta-asymmetry were related to self-reported anger/aggression, but these relations were only significant for athletes with a history of concussion. The current study suggests that athletes with a history of concussion who made a complete return to play and reported to be asymptomatic on a commonly used symptom checklist may still exhibit neural activity associated with increased levels of depression, anxiety and anger/hostility. The current results reinforce the clinical necessity for long-term evaluations of athletes irrespective of apparent symptom resolution, and suggest that EEG may serve as a sensitive tool to identify and track concussion-related alterations in psycho-affective health before they manifest as clinical disorders.
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This study was funded by a Canadian Institute of Health Research grant (#R0017986), awarded to Dave Ellemberg.
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The authors declare that they have no competing interests.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all participants included in the study.
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What is known about the subject: Concussive injuries can lead to persistent alterations in aspects of neurophysiological function essential to cognition and motor function. However, little is known regarding the outcomes of concussive injuries on psycho-affective mood states, and the neural substrates supporting them.
What this study adds to existing knowledge: The current study adds important information regarding the long-term outcomes of concussion on psycho-affective states. Specifically, the current study is the first to describe the EEG correlates of psycho-affective perturbations in active athletes with a history of concussion. In doing so, the data indicate that asymptomatic athletes far removed from injury still exhibit abnormal neural activity associated with increased levels of depression, anxiety and anger/aggression. The current study also demonstrates the clinical utility of evaluating asymmetric EEG activity for enhancing the identification and tracking of concussion-related psycho-affective alterations.
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Moore, R.D., Sauve, W. & Ellemberg, D. Neurophysiological correlates of persistent psycho-affective alterations in athletes with a history of concussion. Brain Imaging and Behavior 10, 1108–1116 (2016). https://doi.org/10.1007/s11682-015-9473-6
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DOI: https://doi.org/10.1007/s11682-015-9473-6