Alzheimer’s disease (AD) is a neurodegenerative disease in which brain cells are progressively destroyed causing a loss of cognitive, memory and physical function and a progressive decline in quality of life.
Approximately 332,000 Australians had dementia in 2014, and this number is expected to increase to 550,000 people by 2030, and 891,000 people by 2050. The biggest reason for the increase in AD incidence is Australia’s aging population, caused by greater life expectancy and the post-war increase in birth rates (the ‘baby boomer’ generation).
The risk factors for Alzheimer’s disease — which are largely associated with reduced physical activity — suggest that exercise can help to prevent or delay Alzheimer’s disease.
Exercise can also be used as a ‘medicine’ for managing established AD by:
People who are physically active have a lower risk of developing AD than those who are inactive. Starting and maintaining an exercise program is associated with reduced levels of beta amyloid — a protein that forms plaques on the brain and is currently thought to be the main cause of AD. Exercise can benefit people who already show signs of AD by improving their quality of life, slowing down the disease progression, and improving physical function and health.
Exercise Right recommends 30 minutes of activity per day, for at least five days a week. This can be broken up into shorter sessions throughout the day, with each session lasting a minimum of 10 minutes.
The goals of exercise to prevent or manage AD are to maintain or increase muscle mass and strength; decrease risk factors for cardiovascular disease and metabolic syndrome; increase testosterone levels; and provide a socially engaging and interactive environment.
Exercise (particularly resistance or weight training) also increases testosterone levels, which can help to protect brain cells and preserve cognitive function.
People with dementia can also benefit from a regular programme of seated exercise sessions, these exercises are aimed at building or maintaining muscle strength and balance, and are less strenuous than exercises in a standing position.