The Use of Heart Rate Variability-Biofeedback (HRV-BF) as an Adjunctive Intervention in Chronic Fatigue Syndrome (CSF/ME) in Long COVID: Results of a Phase II Controlled Feasibility Trial.

J Clin Med · 2025 · PMC12347631 · PMID 40806985

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did not reach statistical significanceno p-value reported

Although individual outcomes did not reach statistical significance, a consistent pattern of more favorable changes was descriptively observed in the experimental group.

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