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首页> 外文期刊>Life sciences >Effects of high-carbohydrate and high-fat dietary treatments on measures of heart rate variability and sympathovagal balance.
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Effects of high-carbohydrate and high-fat dietary treatments on measures of heart rate variability and sympathovagal balance.

机译：高碳水化合物和高脂肪饮食治疗对心率变异性和交感神经平衡的影响。

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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.
机译：目的：我们检验了以下假设：呼吸商（RQ）决定与储存的能量和膳食能量底物代谢相关的交感神经平衡。主要方法：在禁食的两个对照预处理和代谢高脂和高碳水化合物饮料的后处理之后，对六名18-20岁的非洲裔美国男性进行了研究。静息时记录RQ，心率（HR），能量消耗（EE）和血压（BP），并在摄入等热量的高碳水化合物和高脂饮料后1小时至3小时重复。 HR的交感神经调制通过低频/高频（LF / HF）比量化，该低频/高频比来自心律图RR间隔在0.2 Hz时呼吸的快速傅里叶变换（频谱）分析。通过协方差分析和通过线性回归在P <0.05时的相关性分析，评估了与对照相比的峰值后处理值的显着性。主要发现：高碳水化合物和高脂肪的治疗增加了RQ，EE，HR和LF / HF，协变量之间存在显着的相互作用。消除对照，高脂，高脂与高碳水化合物的RQ，EE和HR的协方差，消除对照与高碳水化合物的EE和HR的协方差后，LF / HF值不显着。碳水化合物治疗。在整个RQ值中，EE和LF / HF的相关性显着。意义：这些发现表明，碳水化合物代谢产生的高RQ和交感调节与高静息能量消耗有关。我们得出的结论是，呼吸商可能是心率变异性谱中LF / HF比的重要决定因素，可能是由于呼吸化学感应机制所致。

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