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Low frequency power spectrum is associated with baroreceptor sensitivity in obese individuals during paced breathing
Author(s) -
Baynard Tracy,
Goulopoulou Styliani,
Sosnoff Ruth F.,
Fernhall Bo,
Kanaley Jill A
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.928.3
Subject(s) - supine position , heart rate variability , medicine , cardiology , baroreceptor , aerobic exercise , population , breathing , photoplethysmogram , heart rate , physical therapy , anesthesia , blood pressure , environmental health , filter (signal processing) , computer science , computer vision
Recent data suggests that the low frequency (LF) power spectrum from heart rate variability analyses is indicative of baroreceptor sensitivity (BRS). We aimed to determine to the association between LF and BRS in obese persons and to evaluate the effect of 4 mo of aerobic exercise training on these associations. ECG recordings were obtained in obese individuals (n=55) while supine for 5 min while they performed paced breathing (12 breaths/min), prior to and after 4 mo of exercise training (4 d/wk, 65% VO 2peak ). HRV was analyzed in the spectral domain and log transformed (ln). BRS was assessed using the sequence technique using finger photoplethysmography. Data were further analyzed by creating low and high parasympathetic modulation (PM) groups. LF ln did not change with training during paced breathing (Low PM: 5.15 ±0.17 vs. 5.35±0.18 ms; High PM: 5.07±0.17 vs. 5.21±0.17 ms). LF ln was associated with BRS both pre and post‐training, with stronger relationships observed for the high PM group vs. the low PM group. LF was associated with BRS in this obese population and this relationship was consistent after a 4 mo exercise training program, suggesting LF may be a surrogate for BRS during paced breathing. The association was stronger among obese individuals who had higher baseline levels of parasympathetic modulation. These findings may help further elucidate the role of LF in the HRV spectrum.Pre‐training Log LF and BRS Post‐training Log LF and BRSWhole group 0.60 * 0.53 *Low Parasympathetic Modulation 0.54 * 0.55 *High Parasympathetic Modulation 0.69 * 0.70 ** p<0.05