In this study, we examined whether the slowing of responses that has been observed with increasing age is associated with physiological status. Adults differing on physiological status were administered a choice reaction time task with difficult and easy trials. The results indicated that choice reaction time was related to physiological status in the following manner: on difficult choice reaction time trials, high-fit adults responded faster than did low-fit adults. The present results suggested that low levels of physiological fitness may be associated with behavioral slowing on tasks requiring speeded responses and that the contribution of physiological factors to overall cognitive functioning might be more limited than has previously been thought.
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