aerobic exercise Aging 4 Article 4 Learning 4 adult 4 animal experiment 4 animal tissue 4 biochemical analysis 4 brain 4 controlled study 4 exercise 4 learning 4 male 4 nonhuman 4 priority journal 4 rat 4 upregulation 4 Adrenal Glands 2 Aerobic exercise 2 Animals 2 Anxiety 2 Brain 2 Brain-derived neurotrophic factor 2 Catecholamines 2 Child 2 Child Development 2 Corticosterone 2 Education 2 HPA axis 2 Humans 2