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This study examines resting cardiovascular ANS activity in adolescents with SRC compared to controls early post\u2010injury and after clinical recovery, analyzing its correlation with symptom severity and recovery outcomes. Cardiovascular ANS function was evaluated using heart rate variability (HRV), systolic blood pressure variability (SBPV) and baroreflex sensitivity (BRS). Symptoms were assessed via the Post\u2010Concussion Symptom Scale, and recovery outcomes were categorized by recovery duration. Following acute SRC, no significant differences in HRV, SBPV or BRS were found between SRC and control groups, nor between those with delayed or normal recovery. Post\u2010recovery, SRC participants had higher low frequency (LF) SBPV than controls and their initial assessment. When concussed participants were symptomatic, LF SBPV correlated directly with overall, cognitive, and fatigue symptom severity, while high frequency (HF) HRV inversely correlated with affective symptoms (Spearman's rho: 0.4\u20130.6). Resting cardiovascular ANS function remains unchanged in adolescent athletes acutely after SRC, suggesting it has limited diagnostic and prognostic potential. Although some correlations between individual symptom domains and ANS activity were observed, they were not significantly different from asymptomatic controls, limiting the ability to interpret these findings.<\/jats:p>","DOI":"10.14814\/phy2.70114","type":"journal-article","created":{"date-parts":[[2024,11,3]],"date-time":"2024-11-03T20:41:49Z","timestamp":1730666509000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Symptom clusters and resting cardiovascular autonomic measures in adolescents: From acute concussion to recovery"],"prefix":"10.14814","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2958-8229","authenticated-orcid":false,"given":"Wenjie","family":"Ji","sequence":"first","affiliation":[{"name":"Department of Rehabilitation Science School of Public Health and Health Professions, State University of New York at Buffalo  Buffalo New York 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