The Effects of High-Intensity Exercise on Biological Age

Participants will rotate between three exercise machines (randomly assigned rotation order at outset): A Concept C2 rowing machine, a stationary bicycle, and a treadmill. Study participants will use a different machine each day so that they are using each of the three exercise machines once per week. Two treadmills, two bikes, and two rowers are available during each exercise session. Participants will be randomly assigned to one of three machine orders: treadmill-rower-bike, rower-bike-treadmill, or bike-treadmill-rower. We will employ a percent of heart rate protocol as an exercise intensity measure (77-93% of age-adjusted maximum heart rate) rather than a less well-defined maximal effort protocol or rating of perceived exertion scale. For the purposes of this exercise protocol high intensity exercise will be defined as 77-93% of age adjusted maximum heart rate.

There are no modifications to regular diet or exercise habits for 30 days.