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Resonance Frequency Measurements Are Reliable

A within-subjects study examined the 2-week test-retest reliability of the resonance frequency and three global measures of heart rate variability (HRV). Nineteen undergraduates (16 males and 3 females), 19-22 years of age, participated in this study. A Thought Technology ProComp Infiniti[TM] system...

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Bibliographic Details
Published in:Applied psychophysiology and biofeedback 2011-09, Vol.36 (3), p.219
Main Authors: Fuller, Jordan, Wally, Christopher, Westermann-Long, Andrew, Korenfeld, Daniel, Carrell, Dave
Format: Article
Language:English
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Summary:A within-subjects study examined the 2-week test-retest reliability of the resonance frequency and three global measures of heart rate variability (HRV). Nineteen undergraduates (16 males and 3 females), 19-22 years of age, participated in this study. A Thought Technology ProComp Infiniti[TM] system monitored HR Max--HR Min, pNN50, and SDNN using an Infiniti EKGTM sensor with leads placed on the torso and respiration rate using a strain gauge placed over the navel. The resonance frequency was defined as the breathing rate that maximized the most global measures of HRV. Subjects sat upright in a straight-backed chair with eyes open throughout this study. Following 10-min stabilization and a 5-min resting baseline without feedback, subjects were instructed to follow an animated pacing display designed to guide their breathing from 7.5 to 4.5 breaths per minute in seven descending V-breath-per-minute steps. They breathed at each target rate for 5 min followed by a 1-min buffer period. Subjects were retested using the same procedure 2 weeks later to assess the reliability of these measurements. They received no HRV training or breathing practice during this period. A Pearson Product-Moment Correlation Coefficient revealed that resonance frequency, r(17) = 0.73, p = .000; pNN50, r(17) = 0.65, p = .002; and SDNN measurements, r < (17) = 0.59, p = .008, were reliable, but HR Max--HR Min measurements were unreliable, r(17) = 0.30, p = .212. These findings support protocols that train clients to breathe at their unique resonance frequency to maximize HRV. Keywords: -Resonance frequency -Heart rate variability -Test-retest reliability
ISSN:1090-0586