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Can Heart Rate Variability Biofeedback Improve Athletic Performance? A Systematic Review.

J Hum Kinet · 2020 · PMC7386140 · PMID 32774542

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a notable trendno p-value reported
However, a notable trend in running enhancement of 13.0% (ES = -0.60) was demonstrated by athletes from the HRV BFB group.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.