TY - JOUR
T1 - Patterns of 12-year change in physical activity levels in community-dwelling older women
T2 - can modest levels of physical activity help older women live longer?
AU - Xue, Qian Li
AU - Bandeen-Roche, Karen
AU - Mielenz, Thelma J.
AU - Seplaki, Christopher L.
AU - Szanton, Sarah L.
AU - Thorpe, Roland J.
AU - Kalyani, Rita R.
AU - Chaves, Paulo H.M.
AU - Dam, Thuy Tien L.
AU - Ornstein, Katherine
AU - RoyChoudhury, Arindam
AU - Varadhan, Ravi
AU - Yao, Wenliang
AU - Fried, Linda P.
PY - 2012
Y1 - 2012
N2 - Few studies have addressed changes in physical activity participation over time among the elderly. The authors hypothesized that there were distinct trajectories of physical activity level over time and identifiable predictors of such trajectories, as well as that the maintenance of regular physical activity, even below recommended levels, was associated with lower mortality risk. Using longitudinal data (1994-2009) from 433 initially high-functioning older women aged 70-79 years at baseline, a joint latent class and survival mixture model identified 4 activity trajectory classes: always active (16.6%), fast declining (19.2%), stable moderate (32.3%), and always sedentary (31.9%). Obesity, coronary artery disease, chronic obstructive pulmonary disease, depressive symptoms, low self-efficacy, mobility disability, and low energy were associated with sedentary behavior and/or a fast decline in activity. Women in the fast declining and always sedentary classes had hazard ratios for death of 2.34 (95% confidence interval: 1.20, 4.59) and 3.34 (95% confidence interval: 1.72, 6.47), respectively, compared with the always active class; no mortality difference was found between the stable moderate and always active groups (hazard ratio = 1.24, 95% confidence interval: 0.63, 2.47). Our findings suggest that physical activity does not have to be vigorous to be beneficial and that the gain may be the greatest among women who reported the lowest levels of activity.
AB - Few studies have addressed changes in physical activity participation over time among the elderly. The authors hypothesized that there were distinct trajectories of physical activity level over time and identifiable predictors of such trajectories, as well as that the maintenance of regular physical activity, even below recommended levels, was associated with lower mortality risk. Using longitudinal data (1994-2009) from 433 initially high-functioning older women aged 70-79 years at baseline, a joint latent class and survival mixture model identified 4 activity trajectory classes: always active (16.6%), fast declining (19.2%), stable moderate (32.3%), and always sedentary (31.9%). Obesity, coronary artery disease, chronic obstructive pulmonary disease, depressive symptoms, low self-efficacy, mobility disability, and low energy were associated with sedentary behavior and/or a fast decline in activity. Women in the fast declining and always sedentary classes had hazard ratios for death of 2.34 (95% confidence interval: 1.20, 4.59) and 3.34 (95% confidence interval: 1.72, 6.47), respectively, compared with the always active class; no mortality difference was found between the stable moderate and always active groups (hazard ratio = 1.24, 95% confidence interval: 0.63, 2.47). Our findings suggest that physical activity does not have to be vigorous to be beneficial and that the gain may be the greatest among women who reported the lowest levels of activity.
UR - http://www.scopus.com/inward/record.url?scp=84871672842&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871672842&partnerID=8YFLogxK
U2 - 10.1093/aje/kws125
DO - 10.1093/aje/kws125
M3 - Article
C2 - 22935515
AN - SCOPUS:84871672842
SN - 0002-9262
VL - 176
SP - 534
EP - 543
JO - American Journal of Epidemiology
JF - American Journal of Epidemiology
IS - 6
ER -