The effects of exercise on the brain and chronic pain
How physical activity protects our brain
Physical exercise has a significant impact on the brain, particularly for the prevention of neurodegenerative diseases such as Alzheimer's disease and dementia. The beneficial effects of sport are manifold, ranging from the improvement of cognitive functions to the reduction of the risk of age-related diseases.
Effects of exercise on brain structure and function
Regular exercise is associated with improved neuroplasticity, that is, the brain's ability to adapt its neuronal connections in response to new experiences. This is largely mediated by the release of neurotrophic factors, such as BDNF (brain-derived neurotrophic factor), which promote the survival and growth of neurons. A study has shown that exercise has a direct effect on the hippocampus, a region of the brain key for memory and learning, which tends to shrink with age and in people with dementia. Moreover, exercise increases blood flow to the brain, thereby improving the supply of oxygen and nutrients necessary for the optimal functioning of neurons. This improvement in cerebral vascularisation is also associated with a better elimination of metabolic waste, reducing the risk of accumulation of toxic proteins such as amyloid, implicated in Alzheimer's disease.
Reduction of inflammatory processes and oxidative stress
Physical exercise reduces the levels of systemic inflammation and improves the immune response, factors that are closely linked to the onset of neurodegenerative diseases. Oxidative stress, which contributes to damaging brain cells, is also attenuated by exercise, thereby reducing long-term neuronal damage.
Indeed, several epidemiological studies suggest that moderate to high levels of physical activity can delay age-related cognitive decline. A Japanese study, for example, revealed that moderate to intense physical activity significantly reduces the risk of dementia in men. This finding is corroborated by other research showing that even light exercise, such as daily walking, is associated with a slowing of cognitive deterioration in older adults.
Prevention of neurodegenerative diseases
One of the neurodegenerative diseases most studied in relation to exercise is Alzheimer's disease. Clinical trials have shown that regular physical exercise, particularly aerobic activities, can not only delay the onset of symptoms, but also improve the quality of life of people with mild cognitive impairment. Studies have shown that moderate to high levels of physical activity were associated with a 35% reduction in the risk of developing Alzheimer's disease in healthy adults.
Other protective mechanisms
Beyond neuroplasticity and reduction of inflammation, exercise also improves sleep quality, which is a key factor for brain health. Good-quality sleep, promoted by regular exercise, allows the brain to eliminate accumulated toxins, some of which are involved in the development of neurodegenerative diseases. Moreover, physical activity stimulates the production of endorphins and improves stress management, two factors that contribute to overall mental well-being and to the prevention of disorders such as depression, which may worsen neurodegenerative diseases.
Conclusion
The benefits of exercise on brain health are well documented, ranging from improved cognitive abilities to a reduction in the risk of neurodegenerative diseases. By acting on several physiological mechanisms — neuroplasticity, reduction of inflammation, improvement of cerebral circulation, and stress management — physical exercise represents an effective intervention to preserve brain health throughout life. The integration of physical activity into daily life, whether moderate or vigorous, is therefore a key strategy to prevent diseases such as dementia and improve long-term quality of life.
Frequently asked questions (FAQ)
How does exercise reduce chronic pain?
Physical exercise stimulates the production of endorphins, serotonin and BDNF (neurotrophic factor), which modulate pain perception. It also reduces central sensitisation by normalising the pain circuits of the brain.
What sport is recommended in the case of chronic pain?
Walking, swimming, cycling and yoga are particularly recommended because they combine cardiovascular activity, muscle strengthening and stress management. The return to activity should be gradual, ideally guided by a healthcare professional.
Can osteopathy help the return to sport in the case of chronic pain?
Yes, osteopathy releases joint restrictions and muscular tensions that make physical activity painful. It allows a gradual and safe return to sport, complementary to an adapted exercise programme.
How much exercise is needed to benefit from the anti-pain effects?
Current recommendations advise at least 150 minutes of moderate activity per week. Even 20 to 30 minutes of daily walking produces measurable effects on chronic pain and mood.