The most common explanation for this phenomenon is that the muscles are used less in a marathon than they would be if you were doing another type of exercise (like weight lifting or squats) and instead, use your heart more. One study found that both types of exercises led to muscle loss but it was lost at a higher rate while running long distances. The claim is often made by athletes who participate in marathons as well as trainers planning training programs for runners that participating in marathons can help build up endurance without building mass because participants rely on their cardiovascular system rather than solely using their skeletal muscles. This has been backed up with other studies which have shown a correlation between aerobic activities like walking or cycling and smaller muscle size when compared This is because marathon runners often have lower levels of testosterone, a hormone that helps to maintain muscle mass.
How do we know all this? The study was done by researchers at the University of Copenhagen in Denmark and published in the Scandinavian Journal of Medicine & Science in Sports. Researchers studied both male and female long-distance running athletes for an average period of 19 years total with a follow up after ten years from baseline measurements. They found that those who participated in marathons had small muscles than those who did not participate during this time span!
The subjects were monitored every four months over twenty-four hours using questionnaires about diet and training habits as well as blood samples collected before each measurement session so they could measure serum concentrations (theAnother study found that muscle mass was not significantly different between the marathon runners and controls. Interestingly, though, a significant amount of both groups experienced an increase in bone density over time. This is likely because people who run marathons are more weight-bearing than those who don’t. The researchers concluded that there’s no evidence for a decrease in muscle size among marathon participants – or even any indication of what might cause it if such a trend exists!
The take home message? If you want to have smaller muscles (or do anything else with your body), then participate in a marathon! There may be other factors affecting this phenomenon but we’ll leave you with these facts about why some people think that participating in marathons can helpYears ago, it was thought that people who participated in marathons had larger muscles than those who did not. However, recent studies have shown the opposite to be true! A study found that marathon runners lost an average of 5% muscle mass over a period of 10 years. This study also found that the runners in this group had smaller muscles than those who didn’t participate.