Age and physical activity status effects on appetite and mood state in older humans.

This study examined the influences of age and chronic physical activity status on appetite and mood state. Groups of younger inactive, younger active, older inactive, and older active men and women completed questionnaires each waking hour, rating appetite and mood state for 1 day. Maximal oxygen consumption was 20% lower in older than in younger (p < 0.001) subjects, and 32% lower in inactive than in active (p < 0.001) subjects. Mean hunger (older, 4 +/- 1; younger, 5 +/- 1 arbitrary units (AU); p < 0.01) and desire to eat (older, 3 +/- 1; younger, 4 +/- 1 AU; p < 0.01) were lower in older than in younger subjects. Nadir arousal was higher for the active subjects (active, 3 +/- 1; inactive, 2 +/- 1 AU; p < 0.05). Nadir arousal, nadir pleasantness, and mean pleasantness were higher for the older subjects (p < 0.05). Physical activity status does not influence appetite or the age-associated declines in hunger or desire to eat. The increased nadir arousal of the physically active and older groups is consistent with these subjects experiencing less extreme sleepiness.