For patients with knee OA there is limited evidence that a lower level of physical function is associated with a lower level of physical activity .
There is also limited evidence that depression is not associated with the level of physical activity .
For patients with hip OA there is limited evidence that higher age , higher body mass index ( BMI ) and a low level of physical function is associated with a low level of physical activity .
CONCLUSION A high age ( hip OA ) , a high BMI ( hip OA ) and a low level of physical function ( both hip and knee OA ) are related to a low level of physical activity .
OBJECTIVE To give an overview of factors related to the level of physical activity  in patients with hip or knee osteoarthritis ( OA ) .
Longitudinal study of the long-term relation between physical activity and obesity in adults
BACKGROUND : Earlier observational studies of the relation between physical activity and obesity are inconsistent and ambiguous , showing a clear cross-sectional inverse relation , and a prospect i ve association only when physical activity at the time of follow-up is included . OBJECTIVE : To examine the long-term effect of leisure time physical activity ( LTPA ) on subsequent development of obesity and the effect of body weight on later physical inactivity in a population -based longitudinal setting taking into account the effects of historical changes on future changes as well as pertinent confounders . DESIGN : The study included 3653 women and 2626 men aged 20–78 y selected at r and om within sex – age strata from the general population of Copenhagen . At two surveys , 5 y apart ,  LTPA , body mass index ( BMI ) ( weight/height2 , kg/m2 ) , several possible confounders and modifying factors were assessed . Obesity ( defined as BMI ≥30 kg/m2 ) and LTPA was assessed at the 3rd survey 10 y later . Odds ratios ( with 95 % confidence limits ) for developing obesity between the last two surveys were estimated by logistic regression analysis , taking into account baseline and preceding changes in BMI and LTPA . A similar analysis of odds ratios for physical inactivity as outcome at the 3rd survey was conducted . RESULTS : Compared to physical inactivity , the odds ratios of development of obesity among women with medium and high level of activity were 0.81 ( 0.53 , 1.25 ) and 1.16 ( 0.73 , 1.84 ) , respectively , and among men , the odds ratios were 1.28 ( 0.71 , 2.33 ) and 1.65 ( 0.91 , 2.99 ) , respectively . Compared to median BMI , the odds ratio of later physical inactivity among women with high BMI was 1.91 ( 1.39 , 2.61 ) , and among men the odds ratio was 1.50 ( 1.01 , 2.22 ) . The associations were not confounded or modified by age , pre-existing diseases , smoking , alcohol intake , educational level , occupational physical activity or by familial predisposition to obesity . CONCLUSION : This study did not support that physical inactivity as reported in the freely living adult population in the long term is associated with the development of obesity , but the study indicates that obesity may lead to physical inactivity
For patients with knee OA there is limited evidence that a lower level of physical function is associated with a lower level of physical activity .
There is also limited evidence that depression is not associated with the level of physical activity .
For patients with hip OA there is limited evidence that higher age , higher body mass index ( BMI ) and a low level of physical function is associated with a low level of physical activity .
CONCLUSION A high age ( hip OA ) , a high BMI ( hip OA ) and a low level of physical function ( both hip and knee OA ) are related to a low level of physical activity .
OBJECTIVE To give an overview of factors related to the level of physical activity  in patients with hip or knee osteoarthritis ( OA ) .