New evidence about intense running has added to conflicting research about the health effects of extreme exercise.
Elite athletes who have run a mile in less than 4 minutes tend to live longer than the general population, according to a retrospective study.
According to the"U-shaped" or"reverse J-shaped" hypothesis, increasing exercise decreases the likelihood of cardiac events but only up to a point. Beyond that point, exercise may strain the heart and cause cardiovascular damage, leading to conditions such as atrial fibrillation and cardiac fibrosis. Yet some studies have conversely shown that
The study has significant limitations, such as the lack of knowledge about broader exercise habits and lifestyle, Haykowsky acknowledged."But it's still remarkable that one snapshot in time greater survivorship later in life." The study did not account for several confounders that may explain some of the longevity benefits. For example, genetics likely play a role in distinguishing sub-four-minute mile runners from the general population.
Connelly considers the finding"reassuring" but only one piece of the puzzle. To gain the whole picture and guide clinical care, experts must put together many studies on various sports, considering as many confounding factors as possible. Future research and recommendations should consider factors such as age, sex, and whether exercise habits are continuous or intermittent over a person's lifetime, he said."There's never going to be a one-size-fits-all recommendation.
Exercise Physical Activity Canada Canadian Exercise Physiology Arrhythmia Atrial Fibrillation AF Afib A-Fib Afib Afib Atrial Fib Atrial Fibrillation (AF) Atrial Fibrillation (A-Fib) AF - Atrial Fibrillation Physical Medicine And Rehabilitation Physiatry PM&R Stroke Cerebrovascular Accident CVA - Cerebrovascular Accident Genomics Genomic Medicine Medical Life
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