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Exercise May Help Fight Depression in Seniors

February 18, 2019
0

Kinesiologists at McMaster University have found that physical activity may help fight depression in seniors by stimulating muscle-generated mood boosters.

The findings, published in the American Journal of Physiology—Cell Physiology, reveal that the underlying mechanisms that make us feel good when we exercise persist into old age and highlight the importance of staying active.

“A previous study demonstrated these mechanisms in healthy young adults; however, it was unknown whether the muscle deterioration which accompanies aging would preclude older adults from achieving similar exercise-induced benefits,” explained David Allison, lead author on the study and a postdoctoral fellow in McMaster’s Department of Kinesiology.

“This could have important implications concerning the use of exercise as a treatment or a preventative strategy for depression in seniors,” he said.

Little is known about the relationship between skeletal muscle and mental health, or how exercise impacts this relationship.

Earlier research has shown that physical activity may help to turn on genes within skeletal muscle, which can then influence the key metabolic pathways that ultimately promote mood-enhancing chemicals, such as serotonin, within the brain.

Muscle loss is a common problem in the elderly, which may restrict that pathway and therefore increase the risk for depression, said Allison.

For the study, a group of healthy men, age 65 and over, followed a 12-week protocol of high-intensity interval training on a stationary bike once a week combined with bi-weekly strength training sessions.

Researchers analyzed blood samples and changes to muscle and determined that three months of exercise was enough to enhance gene expression within the skeletal muscle.

“Even individuals who are already metabolically healthy—with good weight, good blood pressure and blood sugar levels—need to prioritize regular physical activity to maintain or improve upon their mental health,” said Allison. “We have shown such benefits are still achievable in old age and further emphasize the importance of maintaining an active lifestyle.”

This article was adapted from information provided by McMaster University.

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