The heterogeneity in reported effects was reduced in higher quality studies , when physical activity was self-directed with some professional guidance and when there was on-going professional support .
Our review suggests that physical activity interventions have a moderate effect on self reported physical activity and cardio-respiratory fitness , but not on achieving a predetermined level of physical activity .
Due to the clinical and statistical heterogeneity of the studies , only limited conclusions can be drawn about the effectiveness of individual components of the interventions .
BACKGROUND Little is known about the effectiveness of strategies to enable people to achieve an increase in their physical activity .
OBJECTIVES To assess the effects of interventions for promoting physical activity in adults aged 16 years and older , not living in an institution .
Physician-based activity counseling: Intervention effects on mediators of motivational readiness for physical activity
In theory-based interventions for behavior change , there is a need to examine the effects of interventions on the underlying theoretical constructs and the mediating role of such constructs . These two questions are addressed in the Physically Active for Life study , a r and omized trial of physician-based exercise counseling for older adults . Three hundred fifty-five patients participated ( intervention n = 181 , control n = 174 ; mean age = 65.6 years ) . The underlying theories used were the Transtheoretical Model , Social Cognitive Theory and the constructs of decisional balance ( benefits and barriers ) , self-efficacy , and behavioral and cognitive processes of change . Motivational readiness for physical activity and related constructs were assessed at baseline , 6 weeks , and 8 months . Linear or logistic mixed effects models were used to examine intervention effects on the constructs , and logistic mixed effects models were used for mediator analyses . At 6 weeks , the intervention had significant effects on decisional balance , self-efficacy , and behavioral processes , but these effects were not maintained at 8 months . At 6 weeks , only decisional balance and behavioral processes were identified as mediators of motivational readiness outcomes . Results suggest that interventions of greater intensity and duration may be needed for sustained changes in mediators and motivational readiness for physical activity among older adults
The heterogeneity in reported effects was reduced in higher quality studies , when physical activity was self-directed with some professional guidance and when there was on-going professional support .
Our review suggests that physical activity interventions have a moderate effect on self reported physical activity and cardio-respiratory fitness , but not on achieving a predetermined level of physical activity .
Due to the clinical and statistical heterogeneity of the studies , only limited conclusions can be drawn about the effectiveness of individual components of the interventions .
BACKGROUND Little is known about the effectiveness of strategies to enable people to achieve an increase in their physical activity .
OBJECTIVES To assess the effects of interventions for promoting physical activity in adults aged 16 years and older , not living in an institution .