Physical activity has long been touted as a key factor in extending human life expectancy. However, recent Finnish twin studies have shed new light on the relationship between physical activity and longevity, challenging some previously held beliefs.
Researchers from the University of Jyväskylä in Finland delved into the effects of long-term leisure-time physical activity on mortality rates, as well as its potential to offset genetic predispositions to diseases. The study, which included 22,750 Finnish twins born before 1958, tracked their leisure-time physical activity levels in 1975, 1981, and 1990, with mortality follow-up continuing until the end of 2020.
Published in the journals “Medicine & Science in Sports & Exercise” and “European Journal of Epidemiology,” the study found that there are nuanced relationships between physical activity, mortality, and genetic disease risk.
One key finding was the identification of four distinct sub-groups based on leisure-time physical activity levels over a 15-year period: sedentary, moderately active, active, and highly active. Surprisingly, the study revealed that the greatest longevity benefit—a 7% lower risk of mortality—was observed between the sedentary and moderately active groups. Higher levels of physical activity did not provide additional benefits in terms of mortality risk reduction.
Moreover, while short-term analyses showed a clear association between higher physical activity levels and lower mortality risks, this relationship was not sustained in the long term. The study suggests that underlying pre-disease states could limit physical activity and eventually lead to death, rather than the lack of exercise itself.
Interestingly, meeting the World Health Organization’s physical activity guidelines did not guarantee lower mortality risks or alter genetic disease risk. Even twins who adhered to the recommended activity levels for 15 years did not show statistically significant differences in mortality rates compared to their less active counterparts.
Another intriguing finding was the U-shaped relationship between physical activity and biological aging. The study revealed that biological aging was accelerated in individuals who engaged in either very low or very high levels of exercise. Lifestyle factors like smoking and alcohol consumption played a significant role in explaining the associations between physical activity and biological aging.
The research, conducted in collaboration with various institutions, aimed to provide a comprehensive understanding of how genetic and lifestyle factors interact to influence health outcomes. The findings challenge conventional wisdom regarding the benefits of physical activity on longevity and underscore the complexity of these relationships.
In conclusion, the Finnish twin studies offer valuable insights into the intricate connections between physical activity, mortality, genetic disease risk, and biological aging. By incorporating genetic data and long-term follow-ups, the research provides a more nuanced understanding of the role of physical activity in promoting overall health and well-being.
