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[Toward a deeper understanding of motivation towards exercise: measurement of integrated regulation in the Spanish context].

The purpose of this study was to validate the Behavioural Regulation in Exercise Questionnaire in the Spanish context, including items to measure integrated regulation. Participants were 524 exercisers, mean age 29.59 years. The results revealed acceptable fit indices in the confirmatory factor analysis and good internal consistency (with a Cronbach alpha of .87 for integrated regulation). The diverse subscales also conformed to a simplex pattern and the factor structure was invariant across gender and age. Integrated regulation reflected high temporal stability over a 4-week period (ICC=.90). The criterion validity analysis of integrated regulation indicated that this variable was positively predicted by satisfaction of the needs for competence and autonomy. The results regarding the importance of measuring integrated regulation in exercise are discussed.