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OBJECTIVE: Exercisevideogames are increasingly popular asindividuals seek to increase their activity.This study assessed the interaction ofexercise self-efficacy (ESE) levels andperceived task demands of a virtual gameon exercise and physiological reactions.Perceived task demands were manipulatedby changing parameters of theparticipant’s avatar in the exergame.METHODOLOGY: An experimentaldesign was used with 89 femaleundergraduate students (Meanage=18.74+1.05, 18 to 21 years) who wererandomly assigned to the high taskdemand condition (avatar weightremaining constant) or low task demandcondition (avatar losing weight). Prior tothe biking task, the Exercise Self-Efficacyscale was used to measure ESE.Participants biked on a stationary bikewhile immersed in a virtual environmentwith an avatar and were told the avatarwould slim if they cycled fast enough. Onlyhalf of participants’ avatars actuallyslimmed (high task demandmanipulation). During biking,cardiovascular measures were assessedusing a Biopac MP150 system with anImpedance Cardiograph and CNAPMonitor 500. One week after completion ofthe study, participants reported amount ofexercise completed in the last week (in 15minute increments) via the PhysicalActivity Questionnaire. Moderatedregressions and moderated mediationmodels were used to examine theinteraction of ESE levels, experimentalcondition and cardiovascular reactivity onamount of strenuous physical activity.RESULTS: Individuals with high ESEshowed similar results in both taskdemand conditions with physiologicalreactivity patterns indicative of threat.Individuals with low ESE with a staticavatar completed less exercise than thosewith low ESE with a slimming avatar.CONCLUSION: Results confirm thatindividuals with low ESE are particularlyvulnerable to exercise demands.

Physiological Responses to Virtual Exergame Feedback for Individuals with Different Levels of Exercise Self-Efficacy