In response to this , they might adopt race strategies that kept them within the limits of their aerobic capacity .
Another interpretation combines physiological changes and cohort differences : the perceived effort of strenuous swimming may be disproportionately higher for older adults .
In response to this , adults might adopt race strategies that kept adults within the limits of adults ' aerobic capacity .
Another interpretation combines physiological changes and cohort differences : the perceived effort of strenuous swimming may be disproportionately higher for older adults .