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Effects of high-carbohydrate and high-fat dietary treatments on measures of heart rate variability and sympathovagal balance.

Abstract：

AIMS:We tested the hypothesis that respiratory quotient (RQ) determines sympathovagal balance associated with metabolism of stored and dietary energy substrates. MAIN METHODS:Six 18-20 year-old African-American males were studied after two control pretreatments of fasting and post-treatments of metabolizing high-fat and high-carbohydrate beverages. RQ, heart rate (HR), energy expenditure (EE) and blood pressure (BP) were recorded at rest and repeated 1 h-3 h after ingesting isocaloric high-carbohydrate and high-fat beverages. Sympathovagal modulation of HR was quantified by the low frequency/high frequency (LF/HF) ratio from fast Fourier transform (spectral) analysis of the electrocardiogram RR intervals during paced breathing at 0.2 Hz. Significance of differences of peak post-treatment values from controls was evaluated by analysis of covariance and of correlations by linear regression at P<0.05. KEY FINDINGS:The high-carbohydrate and high-fat treatments increased RQ, EE, HR and LF/HF with significant interactions between covariates. LF/HF values were not significant after eliminating covariance of RQ, EE and HR for the control vs. high-fat and for the high-fat vs. high-carbohydrate and after eliminating covariance of EE and HR for the control vs. high-carbohydrate treatments. Across the RQ values, correlations were significant for EE and LF/HF. SIGNIFICANCE:These findings imply that high RQ and sympathetic modulation produced by metabolizing carbohydrate is associated with high resting energy expenditure. We conclude that respiratory quotient may be an important determinant of the LF/HF ratio in the heart rate variability spectrum, likely, by a respiratory chemosensory mechanism.

journal_name

Life Sci

journal_title

Life sciences

authors

Millis RM,Austin RE,Bond V,Faruque M,Goring KL,Hickey BM,Blakely R,Demeersman RE

doi

10.1016/j.lfs.2009.05.006

subject

Has Abstract

pub_date

2009-07-17 00:00:00

pages

141-5

issue

3-4

eissn

0024-3205

issn

1879-0631

pii

S0024-3205(09)00209-4

journal_volume

85

pub_type

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