Hannah R. Koch1, Jesse N. L. Sims1, Mitchell E. Zaplatosch1, David Messer1, Laurie Wideman, FACSM1, William M. Adams, FACSM2, Jessica McNeil1. 1UNC- Greensboro, Greensboro, NC. 2United States Olympic & Paralympic Committee, Colorado Springs, CO.

BACKGROUND: Sleep quality and quantity may be impacted by environmental conditions. Disruptions in sleep quality and quantity have also been shown to impact energy intake (EI). However, the effect of room temperature on sleep outcomes and next morning EI has not been examined. This study examined the impact of sleeping in a temperate (TTEMP) or hot (THOT) condition on objective measures of sleep quality and quantity, and ad-libitum EI and macronutrient intake the next morning. METHODS: Ten healthy adults (female, n = 1; age, 25±4 y; height, 177.9±7.4 cm; body mass, 75.8±13.8 kg; body fat, 13.5±7.1%) completed two overnight trials in an environmental chamber set to 25°C, 30% RH (TTEMP) and 30°C, 30% RH (THOT). Sleep outcomes were measured with polysomnography. Participants self-selected food items to consume ad libitum during breakfast. Paired samples t-tests evaluated the between-condition differences in sleep outcomes and EI. Linear mixed models examined the effects of trial and sleep architecture on breakfast EI and macronutrient intake. Delta values between conditions (THOT - TTEMP) were calculated. Spearman correlations were used to explore the strength of associations between delta sleep architecture with delta EI and macronutrient intake. RESULTS: Percent of time spent in stage 3 sleep was significantly lower in THOT than TTEMP (MD: - 2.51% [95%CI; -4.84, -0.18], p=0.04). There were no differences in total sleep time, sleep efficiency, wake after sleep onset, or other sleep stage durations (REM, stage 1, and stage 2) between conditions (p>0.05). There was no significant difference in ad-libitum EI or macronutrient intake between conditions (p>0.05). No sleep outcomes were significantly associated with EI and macronutrient intake between trials, nor were delta sleep stage durations significantly associated with delta EI and macronutrient intake (p>0.05). CONCLUSIONS: The relative time spent in stage 3 sleep was significantly lower when sleeping in THOT than in TTEMP. However, this difference in relative stage 3 sleep, or other sleep outcomes, was not associated with energy and macronutrient intake the next morning, which were also similar between conditions. Grant or Funding Information: This study was funded in part by Bedgear, LLC.

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