The purpose of the present study was to examine the effects of varying exer
cise intensities and changes in self-efficacy on anxiety reduction in a sam
ple of healthy, older adults. Eighty older adults from a randomized control
led exercise trial participated in this study and completed measures of sel
f-efficacy and the State Anxiety Inventory (SAI) prior to and following lig
ht-, moderate-, and high-intensity exercise. Latent growth curve modeling a
nalyses revealed that although anxiety was reduced following the light-inte
nsity condition, no significant changes in anxiety occurred following the m
oderate-intensity condition, and anxiety increased following the high-inten
sity condition. In addition, changes in self-efficacy were related to anxie
ty responses only in the moderate-intensity condition. An analysis of SAI i
tems indicated that although the Eight-intensity condition resulted in decr
eased arousal and anxiousness, the high-intensity condition resulted in inc
reased arousal and decreased anxiousness. These results are discussed in te
rms of social cognitive theory and the appropriateness of the SAI for use i
n exercise settings.