The effects of fasting compared to eating a meal or snack during simulated night shift on changes in metabolism associated with circadian misalignment: a protocol and methods paper

Aug 8, 2024Sleep advances : a journal of the Sleep Research Society

How fasting versus eating during a night shift affects metabolism linked to body clock disruption

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Abstract

Participants will be assigned to one of three meal timing conditions during a 7-day simulated night shift.

The study will evaluate how meal timing affects metabolism, cognitive performance, and mood.
Serum concentrations of blood glucose, insulin, and free fatty acids will be measured in response to an oral glucose tolerance test.
Meals and snacks will be provided at specific times during the night shift and baseline sleep periods.
Meal composition will be strictly controlled, comprising 45%-65% carbohydrates, 15%-25% protein, and 20%-35% fat.

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STUDY OBJECTIVES: This protocol paper outlines the methods that will be used to examine the impact of altering meal timing on metabolism, cognitive performance, and mood during the simulated night shift.

METHODS: Participants (male and female) will be recruited according to an a priori selected sample size to complete a 7-day within and between participant's laboratory protocol. Participants will be randomly assigned to one of the three conditions: meal at night or snack at night or no meal at night. This protocol includes an 8-hour nighttime baseline sleep, followed by 4 consecutive nights of simulated nightshift (7 hours day sleep; 10:00-17:00 hours), and an 8-hour nighttime sleep (return to dayshift). During the simulated night shift, meals will be provided at ~06:30, 09:30, 14:10, and 19:00 hours (no eating at night); ~06:30, 19:00, and 00:30 hours (meal at night); or ~06:30, 14:10, 19:00, and 00:30 hours (snack at night). Meal composition will be strictly controlled throughout the study (45%-65% carbohydrates, 15%-25% protein, and 20%-35% fat per day) with daily energy provided to meet individual needs using the Harris-Benedict equation (light/sedentary activity). The primary outcome measures are serum concentrations of blood glucose, insulin, and free fatty acids area under the curve in response to the oral glucose tolerance test. Mixed-effect ANOVAs will be conducted.

CONCLUSIONS: This protocol paper describes a methodology to describe an innovative approach to reduce the metabolic disease impact associated with shift work.

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The effects of fasting compared to eating a meal or snack during simulated night shift on changes in metabolism associated with circadian misalignment: a protocol and methods paper

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