History of concussion and lowered heart rate variability at rest beyond symptom recovery: a systematic review and meta-analysis.

Front Neurol · 2023 · PMC10838961 · PMID 38318235

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nearly significantno p-value reported

Another study on Canadian hockey players found that while standing at rest, the concussed group had lower SDNN and nearly significant lowered RMSSD ( 31 ).

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