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 .
User attitudes toward a physical activity promotion website.
BACKGROUND The goal of the present study was to examine participants ' perceptions of a theory-driven , physical activity promotion website . METHODS Participants in the present study were individuals in the website condition of a r and omized trial design ed to test the efficacy of the website .  At 1 month , participants were surveyed regarding their self-report of barriers , frequency of use , and helpfulness of the website . RESULTS Overall , 30 worksite participants were r and omized to the website condition and 24 ( 80 % ) completed the survey at 1 month . The main barrier to using the website was a " lack of time " ( 63 % ) . No participants endorsed trouble using the website , a lack of interest in using the internet , or a lack of interest in changing their activity level as barriers to using the website . Furthermore , most sections of the website were found to be " helpful . " Patterns of use and perceived utility differed by readiness to become active . For example , more respondents in the " preparation " stage at baseline reported using the overall website , in addition to the " becoming active " and " physical activity and health " sections , than those in the " contemplation " stage at baseline . Perceived utility and frequency of use of specific sections were often divergent , where some sections were rated more helpful and used less frequently ( the " Overcoming Barriers " section , for example ) , while the reverse was true for other sections ( the " Walking Fitness Test " section , for example ) . CONCLUSION In conclusion , the website was well accepted and few barriers were noted . Areas of the website that were used less frequently or found to be less helpful will become areas of focus for future iterations of the site
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 .