Are activity promotion interventions based on the transtheoretical model effective? A critical review.

The health benefits of physical activity are well documented yet 70% of adults remain sedentary. It has been suggested that interventions based on the transtheoretical model of behaviour change (TTM) may be useful in promoting physical activity. Published work on the effectiveness of such interventions is therefore critically reviewed. Although there is evidence that TTM based activity promotion interventions are effective in promoting activity adoption, initial results on longer term adherence are disappointing.