title: Prediction of body fat in older adults by time spent in sedentary behavior.
abstract: The purpose of the study was to determine the relationship between sedentary behavior (SB), physical activity (PA), and body fat (total, abdominal) or body size (body-mass index [BMI], waist circumference [WC]) in community-dwelling adults 50 yr old and over. This study included 232 ambulatory adults (50-87 yr, 37.4% ± 9.6% body fat [BF]). Average daily time spent in SB (<100 counts/min) and light (100-759 counts/min), lifestyle-moderate (760-1,951 counts/min), walking-moderate (1,952-5,724 cts/min), and vigorous-intensity (≥ 5,725 counts/min) PA were determined by accelerometer and corrected for wear time. BF was measured with dual-energy X-ray absorptiometry. SB was positively related to measures of BF. Measures of SB, PA, and gender accounted for 55.6% of the variance in total BF, 32.4% of the variance in abdominal fat, and 28.0% of the variance in WC. SB, PA, and age accounted for 27.1% of the variance in BMI. Time spent in SB should be considered when designing obesity interventions for adults 50 yr old and over.
authors.affiliation: Dept of Human Movement Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.
authors.forename: Ann M
authors.initials: AM
authors.lastname: Swartz
authors.forename: Sergey
authors.initials: S
authors.lastname: Tarima
authors.forename: Nora E
authors.initials: NE
authors.lastname: Miller
authors.forename: Teresa L
authors.initials: TL
authors.lastname: Hart
authors.forename: Elizabeth K
authors.initials: EK
authors.lastname: Grimm
authors.forename: Aubrianne E
authors.initials: AE
authors.lastname: Rote
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Strath
mesh_terms: D015502:Absorptiometry, Photon; D000054:Acceleration; D000273:Adipose Tissue / Q000502:physiology*; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D003430:Cross-Sectional Studies; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D009765:Obesity / Q000453:epidemiology / Q000473:pathology*; D057185:Sedentary Behavior; D013995:Time; D014481:United States / Q000453:epidemiology