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 .
Providing sedentary adults with choices for meeting their walking goals.
BACKGROUND This study was design ed to test different ways of meeting the new ACSM/CDC recommendations for physical activity stating that all Americans at least 2 years of age should obtain 30 minutes of moderate intensity activity on most days of the week . METHODS Thirty-two sedentary 18- to 55-year-old adults were r and omly assigned to three groups of brisk walking/6 days per week : 30 continuous minutes , three 10-minute bouts , and 30 minutes in any combination of bouts as long as each bout was at least 5 minutes .  Aerobic fitness , blood pressure , body composition , and physical activity were assessed at baseline , at end of program ( 16 weeks ) , and at follow-up ( 32 weeks ) . RESULTS All groups significantly ( P < /= 0.05 ) improved their aerobic fitness and systolic blood pressure and increased their physical activity at the end of the program . At follow-up all groups maintained these changes , while additionally reducing their percentage body fat and diastolic blood pressure . CONCLUSION These findings demonstrate that a walking prescription of 30 minutes per day on most days of the week with the choice to walk in as little as 5 minute bouts can improve cardiovascular health and body composition , as well as help sedentary people maintain those improvements over time . This is supported by all participants indicating that " making walking part of my lifestyle " was the most important factor in maintaining their walking habits
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 .