After specification of mediation models using a bias-corrected bootstrapping procedure , a series of reciprocal effects analyses assessed : a ) the reciprocal effects of changes in exercise and fruit and vegetable intake , resulting from the treatments , b ) the reciprocal effects of changes in the three psychosocial variables tested ( i.e. self-efficacy , mood , and self-regulation ) and fruit and vegetable change , resulting from change in exercise volume , and c ) the reciprocal effects of changes in the three psychosocial variables and exercise change , resulting from change in fruit and vegetable intake .