Dados do Trabalho

Título

Poor sleep quality and sleepiness are associated with increased resting energy expenditure and worse dietary practices.

Introdução

The notion that sleep promotes changes in food intake are well established; however, the sleep-associated effect on resting energy expenditure (REE) is poorly explored. Changes in REE are associated with raised adiposity. Several earlier predictive equations developed for REE only consider variables such as lean body mass (LBM), age, and sex, not including other variables, such as sleep. Previous studies suggest contradictory effects of sleep on energy expenditure, suggesting that poor sleep quality increases energy expenditure by activating stress response systems.

Objetivo

To verify the effect of sleep quality on resting energy expenditure and dietary practices.

Métodos

These are preliminary data extracted from a cross-sectional study conducted between May and August 2021. Only adults with sedentary behavior and who did not use anxiolytics, antidepressants, or sleep-inducing drugs were included. The study was approved by the Ethics and Research Committee of UNIFESP n: 0910/2020. The Pittsburg Sleep Quality Index (PSQI) and Epworth Sleepiness Scale were used to assess sleep quality and excessive daytime sleepiness. Dietary practices were verified by a multidimensional questionnaire that assesses adherence to the dietary guidelines for the Brazilian population. LBM was assessed by bioelectrical impedance (Model 310e - Biodynamics®) and REE by indirect calorimetric (FITMATE – COSMED®). After analyzing the normality of the data, a linear multivariate regression model was used, considering REE as the dependent variable.

Resultados

The regression model explained 68% of the dependent variable (R2 = 0.68; p <0.001). LBM ( = 16.8; p<0.01), age ( = -6.39; p = 0.028), Pittsburgh score ( = 35.48; p = 0.002) and Epworth score ( = 14.65; p = 0.025) were predictive for REE. Still, we found that the group with poor sleep quality had worse dietary practices (p = 0.031).

Conclusões

Greater LBM, Pittsburg, and Epworth scores are associated with higher REE; nevertheless, higher PSQI score was negatively associated with dietary practices, suggesting that despite the increased REE, poor sleep quality and sleepiness worsen dietary practices.

Palavras-chave

Sleep. Sleepiness. Energy expenditure. Dietary intake.