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Considerable evidence has indicated that group-based physical activity may be a promising approach to reducing and preventing age-related illness. However, this research has not examined the mechanisms by which cohesion may impact on behaviour. The purpose of the present research was to utilise the theory of planned behaviour to investigate the mechanism by which group cohesion may affect physical activity intention. Participants were recruited from an existing physical activity intervention studying the effects of group cohesion on physical activity behaviour. The outcomes of this intervention are reported elsewhere. This paper presents data from a sub-sample of the intervention population (N = 74) that examined the mediating relationships between the theory of planned behaviour and group cohesion on physical activity intention. Analyses showed that attitude and perceived behavioural control mediated the relationship between specific group cohesion concepts and physical activity intention. The direct measure of subjective norm failed to display a mediating relationship. The mediating relationships displayed between attitude and perceived behavioural control and physical activity intention provide insight into potential mechanisms by which group cohesion may affect behaviour. [ABSTRACT FROM AUTHOR]

This study contrasted the effects of an enhanced group intervention program against a standard group intervention, with specific reference to the influences of group cohesion on changes in health-related physical activity of older adults. Older adults (N = 122) took part in a 12-week intervention with repeated post-intervention follow-up (6 & 12 months) assessing physical activity behaviour and perceptions of group cohesion. Results indicated significant positive change (p < 0.05) across time. but a non-significant difference between groups, for physical activity behaviour. For group cohesion, results indicated a significant negative (p < 0.05) change across time and similar to physical activity behaviour, a nonsignificant difference between the intervention groups. Further research is needed to understand the mechanism that fosters group cohesion in order to develop future interventions aimed at increasing physical activity behaviour and adherence in older adults. [ABSTRACT FROM AUTHOR]