Key result
Paced breathing creates a stronger relationship between RR interval and high-frequency heart rate variability compared to free breathing, with a significantly different regression slope.
Why the study?
Does paced breathing compared to free breathing alter the relationship between RR interval and high-frequency heart rate variability?
Population
270 adults (150 men, 120 women), mean age 34.5 +/- 11.4 years
Comparison
5 minutes of supine rest with paced breathing vs 5 minutes of supine rest with free breathing
Design
Cross-sectional
Follow-up
5 minutes
Authors
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Supports paced breathing for vagal HRV assessment; hypothesis-generating and requires prospective validation before practice change.
Cross-Sectional (n=270)
Does paced breathing compared to free breathing alter the relationship between RR interval and high-frequency heart rate variability?
Paced breathing protocols are preferable for assessing cardiac vagal outflow using high-frequency heart rate variability, as they create a stronger linear relationship with RR intervals without saturation at typical heart rates.
Sandercock et al. (2008) reported a cross-sectional. Paced breathing vs. Free breathing was evaluated on Relationship between RR interval and the natural logarithm of HF power (lnHF). Paced breathing creates a stronger relationship between RR interval and high-frequency heart rate variability compared to free breathing, with a significantly different regression slope.
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