@article {8619, title = {Accelerometer-Measured Sedentary Patterns are Associated with Incident Falls in Older Women.}, journal = {J Am Geriatr Soc}, year = {2020}, month = {2020 Nov 30}, abstract = {

BACKGROUND/OBJECTIVE: Falls cause significant problems for older adults. Sedentary time is associated with lower physical function and could increase the risk for falls.

DESIGN: Prospective study.

SETTING: Sites across the United States.

PARTICIPANTS: Older women (N = 5,545, mean age 79 years) from the Women{\textquoteright} Health Initiative Objective Physical Activity and Cardiovascular Health study.

MEASUREMENTS: Accelerometers worn at the hip for up to 1 week collected measures of daily sedentary time and the mean sedentary bout duration, a commonly used metric for sedentary accumulation patterns. For up to 13 months after accelerometer wear, women reported daily whether they had fallen on monthly calendars.

RESULTS: In fully adjusted models, the incident rate ratios (95\% confidence interval) for quartiles 1 (lowest), 2, 3, and 4 of sedentary time respectively were 1.0 (ref.), 1.07 (0.93-1.24), 1.07 (0.91-1.25), and 1.14 (0.96-1.35; P-trend = .65) and for mean sedentary bout duration was 1.0 (ref.), 1.05 (0.92-1.21), 1.02 (0.88-1.17), and 1.17 (1.01-1.37; P-trend = .01), respectively. Women with a history of two or more falls had stronger associations between sedentary time and falls incidence compared with women with a history of no or one fall (P for interaction = .046).

CONCLUSIONS: Older women in the highest quartile of mean sedentary bout duration had a significantly increased risk of falling. Women with a history of frequent falling may be at higher risk for falling if they have high sedentary time. Interventions testing whether shortening total sedentary time and/or sedentary bouts lowers fall risk are needed to confirm these observational findings.

}, issn = {1532-5415}, doi = {10.1111/jgs.16923}, author = {Rosenberg, Dori E and Rillamas-Sun, Eileen and Bellettiere, John and LaMonte, Michael and Buchner, David M and Di, Chongzhi and Hunt, Julie and Marshall, Stephen and Stefanick, Marcia and Zhang, Yuzheng and LaCroix, Andrea Z} }