Dopamine D2/3-receptor availability and its association with autonomous motivation to exercise in older adults: An exploratory [ 11 C]-raclopride study.

This study could not confirm the suggested link between striatal D2/3R availability and subjective autonomous motivation to exercise among older adults. The exploratory findings, however, propose that frontal brain regions may be involved in the intrinsic regulation of exercise-related behaviors, though this has to be confirmed by future studies using a more suitable ligand and objective measures of physical activity levels.