title: Risk for losing physical independence in older adults: the role of sedentary time, light, and moderate to vigorous physical activity.
abstract: This study examined the association of a range of physical activity intensities and sedentary behavior with the risk of losing physical independence later in life in community-dwelling older adults. A total of 131 males and 240 females, aged 65-103 years, were enrolled. Physical activity (PA) and sedentary time were assessed with accelerometers and the risk for losing physical independence in later years was assessed with the self-reported composite physical function (CPF) scale adjusted for age. Participants were divided in two groups - high risk group (HRG) and low risk group (LRG), according current CPF. According to the multiple logistic regression analyses, sedentary time was not a significant predictor. The odds of a male participant being in the LRG were 12.19 times higher than those of a female (95% CI 5.06-29.39). Both, light PA (OR=1.01; 95% CI 1.01-1.02) and MVPA (OR=1.432; 95% CI 1.21-1.69) had a significant main effect on the risk of losing physical independence. Age and gender interacted with moderate to vigorous PA (MVPA) to predict the risk of losing physical independence. Thus, as age increases, participants that are more physically active became less likely (OR=0.997; 95% CI 0.995-0.999) to be in the HRG than younger participants. Similarly, the odds of a physically active women being physical independent in later life are higher (OR=0.94; 95% CI 0.91-0.96) than those of a physically active men. These new findings suggest that light PA, and MVPA are significantly associated with the risk of losing physical independence later in life, and age and gender combined with MVPA have an interaction effect on physical independence of older adults.
authors.affiliation: Research Centre in Physical Activity, Health and Leisure (CIAFEL), Faculty of Sport, University of Porto, Rua Dr. Plácido Costa 91, 4200-450 Porto, Portugal; Higher Education Institute of Maia (ISMAI-CIDAF), Av. Carlos Oliveira Campos - Castêlo da Maia, 4475-690 Maia, Portugal. Electronic address: emarques@fade.up.pt.
authors.forename: Elisa A
authors.initials: EA
authors.lastname: Marques
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada-Dafundo, Portugal. Electronic address: fbaptista@fmh.utl.pt.
authors.forename: Fátima
authors.initials: F
authors.lastname: Baptista
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada-Dafundo, Portugal. Electronic address: dianasantos@fmh.utl.pt.
authors.forename: Diana A
authors.initials: DA
authors.lastname: Santos
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada-Dafundo, Portugal. Electronic address: analiza.monica@gmail.com.
authors.forename: Analiza M
authors.initials: AM
authors.lastname: Silva
authors.affiliation: Research Centre in Physical Activity, Health and Leisure (CIAFEL), Faculty of Sport, University of Porto, Rua Dr. Plácido Costa 91, 4200-450 Porto, Portugal. Electronic address: jmota@fade.up.pt.
authors.forename: Jorge
authors.initials: J
authors.lastname: Mota
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada-Dafundo, Portugal. Electronic address: lsardinha@fmh.utl.pt.
authors.forename: Luís B
authors.initials: LB
authors.lastname: Sardinha
mesh_terms: D061725:Accelerometry; D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D057187:Independent Living; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D012307:Risk Factors; D057185:Sedentary Behavior; D057566:Self Report; D012737:Sex Factors
keywords: Accelerometer; Elderly; Physical activity; Physical function; Physical independency; Sedentary time