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Impact of circadian misalignment on energy metabolism during simulated nightshift work
How disrupted body clocks affect energy use during simulated night shift work
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Abstract
Total daily energy expenditure decreased by ∼3% on each of the second and third nightshift days.
- Energy expenditure increased by ∼4% on the transition day to the first nightshift, following an afternoon nap.
- Energy expenditure decreased by ∼12-16% during scheduled daytime sleep opportunities, despite poor sleep quality.
- Total daily fat utilization increased on the first and second nightshift days, while carbohydrate and protein utilization decreased on the second nightshift day.
- Ratings of hunger were lower during nightshift days, even with decreased levels of the satiety hormones leptin and peptide-YY.
- Findings indicate that working and eating during the biological night may be linked to reduced energy expenditure and increased risk of weight gain.
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