Runners run at absolute top speed for the entire duration of their contest.

[rossce122]

And also, the four hundred meter dash is the longest run in track and field competition. There are races in track and field that are longer than 400 meters, such as the mile, but none of the longer races are called ??sprints.?? The reason that sprinters don't run the mile is because they literally cannot. Nobody could give an all out strength and keep 100% exertion for an entire mile.  NO2 BURST (This technique of age related muscle tissue loss is named ??sarcopenia.??) By the time a female (or man) approaches age 75, she will have lost roughly twenty five pounds of ligament compared to what she had in her childhood. That makes a huge influence on person's capability to perform everyday tasks like walking, climbing stairs, and getting out of a chair. More mature adults need productive strength training to retain and improve their standard of living.I recently corresponded with Wayne Westcott, Ph.D., an exercise physiologist and productive researcher at Quincy College in Massachusetts. Recently he conducted an enlightening study that investigated the effects of weight training on more mature adults in a retirement center offering assisted living care.  http://www.healthsupreviews.com/no2-burst/