0699 Daytime Physical Activity and Subsequent Changes in Sleep in Older Men: The MrOS Study

• Published in: Sleep (New York, N.Y.) N.Y.), 2018-04, Vol.41 (suppl_1), p.A260-A260
• Main Authors: Li, J, Blackwell, T, McPhillips, M, Smagula, S F, Pack, A, Ancoli-Israe, S, Gooneratne, N, Stone, K
• Format: Article
• Language: English
• Subjects: Exercise; Older people; Sleep
• ISSN: 0161-8105; 1550-9109
• DOI: 10.1093/sleep/zsy061.698

Abstract Introduction Limited daytime physical activity may impact nocturnal sleep in older adults. In addition to the amount of daytime physical activity, the timing of activity may also play a role in night-time sleep. To inform strategies for preventing sleep problems in older adults, we sought to identify which aspects of activity (e.g., timing or amount) were related to changes in nocturnal sleep among older men over a six-year period. Methods A total of 988 community-dwelling men aged 67 and older wore wrist actigraphs and completed in-home polysomnography (PSG) in 2002–04 (baseline) and 2009–11, as participants in the Osteoporotic Fractures in Men Study (MrOS) Sleep ancillary study. Physical activity at baseline was assessed using activity count per minute from actigraphy. Morning, afternoon, and evening physical activity were defined as average activity from rise time to noon, noon to 4pm, and 4pm till bedtime, respectively. Primary sleep measures included sleep efficiency (SE) from actigraphy and slow wave sleep (SWS) from PSG. Changes in sleep (follow-up minus baseline scores) were analyzed both continuously (per 100-unit activity increase) and dichotomously (lowest quartile vs three other quartiles). Results Higher overall daytime physical activity (β=0.15, p