0299 The Effects of Chronic Sleep Restriction on Calorie and Macronutrient Intake

Abstract Introduction Chronic sleep restriction (CSR) has been associated with increased calorie intake and consumption of fats carbohydrates, inconsistent changes in protein. However, the majority studies have either observational field no intervention, or laboratory-based where food availability may not reflected participants’ real-world choices. We hypothesized that calorie, fat, carbohydrate would increase during a week imposed CSR compared to satiation (SS) among individuals living their home environment. Methods Twelve healthy participants (6 females) kept fixed sleep-wake schedule, constant waketime, at for four weeks (actigraphy confirmed compliance). During one three, maintained 9 hours bed. two four, were randomly assigned experimental 5 time-in-bed crossover design. Participants documented both using picture-based meal logging application (MealLogger). Intake calories macronutrients classified by blinded evaluators. Descriptive statistics calculated SAS (Cary, NC). Results averaged 4.43 ± 0.33 (SD) per night 7.42 0.42 SS. consumed daily average 1812 672 kilocalories, 71 31 grams total 217 69 84 40 protein CSR, 1682 514 68 23 198 61 77 32 Conclusion Preliminary descriptive findings suggest that, on average, more calories, from an each macronutrient group, satiation. Further analysis is needed determine whether these differences are statistically different identify when conditions. Support (If Any) Supported Force Health Protection Program Office Naval Research (SAA2402925-1, Contract Award no. N0001418IP00050) NASA Airspace Operations Safety Program, System-Wide Safety.