Introduction: Fatigue is a prevalent health and safety risk, leading to reduced productivity and increased accidents, that is frequently associated with poor sleep quantity and/or quality. While wrist actigraphy has been validated for the objective assessment of sleep and wake states, little is known about the ability of actigraphy-based sleep measures to predict next-day levels of fatigue. Methods: In an ongoing study with currently N=25 participants, N=15 insomnia disorder based on DSM-V criteria (ID: 2 males, ages 18-49) and N=10 healthy controls (HC: 3 males, ages 18-47) participants wore a Respironics Actiwatch and reported fatigue levels on a scale of 0-10, with higher scores indicating greater fatigue, daily across seven days using the REDCap electronic data capturing system. Daily Actiwatch measures for total sleep time (TST), sleep efficiency (SE), number of awakenings, and wake after sleep onset (WASO) were used to predict fatigue ratings the following day using linear regression analysis. Results: ID reported more fatigue (ID: 4.68±.28; HC: 1.9±.20; p<0.001) over the study week and had longer total WASO than HC (ID: 42 ± 3.2min; HC: 30 ± 3.2min; p<0.05). TST, SE, and number of awakenings did not differ significantly between groups. More minutes of WASO the night before predicted higher next day subjective ratings of fatigue in ID but not HC. Conclusion: Time spent awake during the sleep period, rather than total hours of sleep or number of awakenings, appears to contribute to next day fatigue in ID, suggesting that certain sleep measures assessed by actigraphy may be useful for predicting daytime fatigue in ID. Further analyzes will investigate the relationship between other actigraphy- based sleep measures (e.g., daily mobility measures, sleep/wake bout length) and fatigue in insomnia disorder and in health controls.
CITATION STYLE
Devine, J., Scott-Sutherland, J., Mullington, J., & Haack, M. (2017). 0415 USEFULNESS OF WRIST ACTIGRAPHY SLEEP MEASURES IN PREDICTING FATIGUE IN INSOMNIA DISORDER. Sleep, 40(suppl_1), A154–A154. https://doi.org/10.1093/sleepj/zsx050.414
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