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HRV Myths: Resting LF Power Shows HRV Training Success

Updated: Jan 15

LF band power assesses the success of HRVB while your client breathes from 4.5-7.5 bpm. However, when breathing from 12-18 bpm during resting baselines, you should not expect increased LF power unless the vagal brake is stuck. Instead, use HF power during post-training baselines to confirm HRVB training success. The natural log of HF power is a surrogate for vagal tone. This Real Genius episode draws heavily on Dr. Don Moss' clinical experience, extensive writing, and HRV presentations. It was illustrated by Dani S@unclebelang and written by Fred Shaffer and Zachary Meehan.

Real Genius

Note. HF amplitude (blue) is greatest in the post-training baseline power spectral display. In contrast, LF amplitude (green) is much lower since the client breathed normally. BioSource releases one new WEBTOON episode weekly to support science literacy. If you like this, please check out our growing collection. If you are fond of dogs, cats, and squirrels, enjoy our Cooperville series. We missed Bloom County and Calvin & Hobbes and wanted to provide a safe space of gentle humor and innocent fun.

Learn More

BCIA Clinical Update Series, Add Slow-Paced Contraction to Heart Rate Variability Biofeedback, January 26, 2024, 11am Pacific, Noon Mountain, 1pm Central, 2pm Eastern. Presented by Fred Shaffer PhD, BCB, BCB-HRV. Matt Bennett, Optimal HRV Co-Founder, recently interviewed me about HRV time-domain measurements. This podcast is available at or wherever you listen to your podcasts. 

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