Two-week prospective.
Participants were a random sample of university students who were subsequently randomized to groups who completed either measures of behavioural intention (n?=?179) and behavioural resolve (n?=?227) in relation to exercise and a 2-week follow-up of exercise behaviour.
Comparing the two measures showed that the behavioural resolve construct explained significantly more variance in exercise behaviour than the standard intention construct (q?=?.35). Further comparison of the two measures showed that absolute discordance with subsequent exercise behaviour was considerably lower with behavioural resolve (mean?=??.09) compared to behavioural intention (mean?=??1.28).
These findings indicate that at least some of the intention-behaviour gap may be from inadequate measurement of the motivational domain, and this can be partially rectified with shifting to a behavioural resolve measure.