A recently published study confirmed that in people over 60 who exercise 150 minutes each week, there is an increase in short term memory functions. MRI scans show an increase in the size of the hippocampus and BDNF ( brain derived neurotrophic factor ) which are responsible for brain growth and short term memory functions. The hippocampus is involved in immediate recall ( up to 24 hours ) and normally shrinks by 0.5% yearly. It appears that the 150 minute threshold is the minimum number to cause these changes ( thirty minutes daily ). Walking is adequate to meet the criteria.
This study advances a prior one which showed people 65 and older who walked 10 miles a week had 1/2 the dementia of those who did not. ( 1& 1/2 miles daily ). Again, all current data shows that aerobic exercise increases blood flow to the brain ( as well as the heart and genitals ) and promotes healthy functioning. No one lives forever, but you can extend your time and health, as well as brain functioning , with daily exercise. Time to get off the couch!