Four Heart Rate Variability Myths
Four HRV myths are Heart Rate Variability Is Bad, Stability Is Good, The Sympathetic Nervous System Plays a Major Role in Short-Term HRV,...
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The BioSource Blog
BioSource Faculty Explain Core Concepts Based on
Peer-Reviewed Science
BioSource Faculty
- Dec 3, 2022
- 12 min
Rethinking the Resonance Frequency (RF) - Part 2: Slow-Paced Breathing
Resonance frequency (RF) assessment identifies the stimulation frequency producing the greatest amplitude heart rate oscillations in one...
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BioSource Faculty
- Nov 15, 2022
- 15 min
A Guide to Selecting HRV Norms
Measurement context and client characteristics are crucial to interpreting HRV time- and frequency-domain measurements. In this post, we...
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BioSource Faculty
- Oct 22, 2022
- 13 min
HRV Time-Domain Measurements for Smart People
HRV Time-Domain Measurements for Smart People describes these measurements, caveats, and practical applications.
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Fred Shaffer
- Jul 31, 2022
- 6 min
Slow-Paced Contraction Increases HRV
Slow-paced contraction to increase heart rate variability
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Fred Shaffer
- Jul 28, 2022
- 3 min
Low-Frequency Power and Coherence Index HRV Biofeedback Training Success
The low-frequency (LF) band (0.04-0.15 Hz) is affected by breathing from ~3-9 bpm (Task Force, 1996). The baroreflex system’s resonance...
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Fred Shaffer
- Jul 27, 2022
- 2 min
When Should You Not Use PPG Sensors to Measure HRV?
The electrocardiograph (ECG) and photoplethysmograph (PPG) are two methods of detecting heart rate (HR) and heart rate variability (HRV)....
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Fred Shaffer
- Jul 26, 2022
- 1 min
How HRV Biofeedback Increases RSA
Respiratory sinus arrhythmia (RSA) is the speeding and slowing of the heart across each breathing cycle. RSA is the primary and entirely...
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Fred Shaffer
- Jul 26, 2022
- 2 min
Faster Heart Rates Lower HRV and Increase Dementia Risk
Heart rate (HR) is important because a high rate can reduce heart rate variability (HRV), the changes in the time intervals between...
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