Abstract
The Sport Commitment Model (SCM) is a recent model that explains which factors determine the involvement on sport or exercise practices. This model has been already validated in other countries in the physical exercise setting and in amateur and professional sport. The aim of our study was to validate this model also in the Italian context, particularly in masters swimming. Therefore we examined a sample of 523 masters swimmers and we studied the effect of some psychosocial determinants. Results permit to evidence the validity of the model also in the Italian context, and to support the importance of the sources considered in the original model and the relevance of social agents we considered.