After a year of aerobic exercise, I’ve not only improved my fitness. shifted MRIThis suggests that exercise may help maintain brain health long into old age.
study: Effects of fitness and exercise on brain age: a randomized clinical trial. Image credit: Robert Kneschke/Shutterstock.com
12 months of moderate to vigorous aerobic exercise may reduce brain age biomarkerthe brain-predicted age difference (brain-PAD) in young to middle-aged adults. Sports Health Science Journal.
Exercise habits appear as an early determinant of brain aging
Lifestyle habits, including physical activity, play an important role in modifying midlife risk factors associated with age-related morphological and functional brain deterioration, dementia, and other neurodegenerative diseases. Regular physical activity during midlife is thought to be associated with lower risk of cognitive decline and Alzheimer’s disease in later adulthood.
Existing evidence indicates that the long-term neurological effects of cardiometabolic health and lifestyle begin years before clinical symptoms of age-related cognitive decline appear. Even though cardiovascular disease and lifestyle risk factors in midlife have a major impact on brain health, most physical exercise interventions are aimed at improving cardiorespiratory fitness (CRF) is restricted to late adulthood.
This lack of strategic intervention highlights the need to assess the effects of physical exercise in early and mid-adulthood on biomarkers associated with age-related brain health and estimated brain age.
Mechanistic evidence shows that exercise improves brain health by increasing CRF. higher CRF Associated with improved cognitive performance and reduced risk of dementia. Reductions in cardiometabolic risk factors such as blood pressure and weight through exercise have also been associated with improved brain health.
Given the important link between exercise and brain health as we age, researchers from the AdventHealth Institute and the University of Pittsburgh investigated the effects of a 12-month aerobic exercise intervention on brain health. CRF Brain-PAD is a neuroimaging-based surrogate marker of brain aging.
One-year randomized trial tests the effects of aerobic exercise
This 12-month randomized clinical trial involved 130 participants between the ages of 26 and 58 who were relatively healthy but not physically active. They were randomly assigned to a moderate-to-vigorous aerobic exercise group (intervention group) or a comparison group with usual care (control).
Participants in the intervention group completed two supervised 60-minute sessions per week in a laboratory setting alongside their at-home exercise, achieving 150 minutes of exercise per week.
Effects of exercise CRF and brain age was assessed at baseline and 12 months later. Brain age was assessed using the brain predicted age difference, brain-PAD. This neuroimaging biomarker quantifies the gap between chronological age, chronological age, and predicted brain age derived from structural magnetic resonance imaging and machine learning algorithms. Cognitive performance and dementia outcomes were not the primary endpoints of this trial.
The influence of potential mediators on the effect of exercise on brain age was also analyzed. These mediators are associated with body composition, blood pressure, and brain-derived neurotrophic factor (BDNF).
Exercise reduced brain age based on MRI by nearly a year
In this study, CRF and decreased brain PAD at baseline. The findings indicate that people with improved heart, lung, and blood vessel function in early and mid-adulthood tend to have “younger-looking” brains. MRI. However, this cross-sectional association does not directly measure the rate of brain aging or predict an individual’s long-term brain aging trajectory.
After 12 months of intervention, participants in the exercise group showed an average decrease in brain PAD of about 0.60 years, while the control group showed a non-significant increase of about 0.35 years. The between-group difference was nearly 1 year of lower brain PAD in the exercise group compared to controls, equivalent to 0.95 years. No such improvement in brain health was observed in the control group, which received 12 months of standard treatment.
Regarding CRFThe study found that participants in the exercise group significantly improved their maximum oxygen uptake, a measure of cardiovascular fitness and aerobic endurance, at 12 months. In contrast, participants in the control group showed a small decrease. No significant effects of the exercise intervention on body composition, blood pressure, or circulating brain-derived neurotrophic factor levels were observed. but, BDNF A borderline increase was seen in the exercise group compared to controls.
Mediation analyzes conducted to identify possible physiological and biological mediators of the observed associations revealed improvements in health status caused by exercise. CRF Exercise has no significant effect on reducing brain aging as measured by Brain-PAD. Similarly, no mediating effects of body composition, blood pressure, or brain-derived neurotrophic factor were observed in the observed associations.
Exercise in early and midlife is associated with healthier brain markers of aging
This study highlights the importance of a 12-month moderate-to-vigorous aerobic exercise program to improve cardiorespiratory fitness and reduce neuroimaging-based markers of brain aging in young and middle-aged adults.
This study found that for every standard deviation increase in maximal oxygen uptake of approximately 7 mL/kg/min, cerebral PAD decreased by approximately 1.83 years. These findings suggest that people with higher levels of CRF The midlife brain is less vulnerable to aging, as reflected in . MRI-Based brain age estimation. Links to existing evidence CRF Considering gray matter volume and white matter integrity further supports these findings.
Regarding possible mediators of the observed associations, the study did not find the following effects: CRF Regarding the reduction of brain aging due to exercise. One possible explanation is physical changes caused by exercise. CRFas measured by maximal oxygen uptake, reflects modifiable factors in lifestyle. CRF. In contrast, familial factors such as shared environment and genetic factors CRF Variability when measured in cross section.
Another explanation is CRF It may be more pronounced in people with high cardiovascular risk. The current study primarily included healthy young-to-middle-aged adults with relatively low cardiovascular risk, which may mask mediation that is only present in those who are asymptomatic or have overt vascular pathology.
The authors also noted several limitations, including that only about 62 percent of participants completed post-intervention brain imaging and that COVID-19-related disruptions affected follow-up assessments.
Overall, the findings suggest that moderate-to-vigorous physical activity in early and mid-adulthood may slow the progression of brain aging as estimated by neuroimaging biomarkers and potentially reduce the risk of dementia in later adulthood, although longer-term studies are needed to determine whether these brain-PAD changes lead to sustained cognitive effects or clinical benefits.