Article 1 aged 1 aging 1 athlete 1 brain region 1 cognition 1 controlled study 1 cross-sectional study 1 demography 1 early commenced sport training 1 early-commenced sports training 1 excessive training 1 exercise intensity 1 female 1 gray matter volume 1 human 1 human experiment 1 male 1 motor performance 1 neuroimaging 1 normal human 1 nuclear magnetic resonance imaging 1 older athletes overexertion 1 physical activity 1 precuneus 1 sport 1 training 1