How would you like to have the immune system of a 20-year-old? Daily physical activity may be the answer. A new study from the UK found that cyclists between the ages of 55 and 79 who exercised regularly throughout their lives had the immune systems, muscle mass, and cholesterol levels of much younger people. What’s more, the men’s testosterone levels remained high. The researchers set out to examine the aging process in men and women who have exercised most of their adult lives.
They recruited 125 amateur cyclists aged 55 to 79. The 84 men in the study had to be able to bike about 62 miles in less than 6.5 hours, while the 41 women had to be able to cycle about 37 miles in 5.5 hours. To assess the effects of exercise on aging, the researchers compared the cyclists to 75 healthy people in the same age range, as well as to 55 adults between the ages of 20 and 36. One of the findings of the investigation was that the thymus, an organ that makes immune cells and starts to shrink and produce fewer of these cells starting at about age 20, continued to function in the older cyclists as it does in younger people generating as many immune cells.
