LiveStrong.com, Feb 1, 2014
Checking your heart rate after walking just one mile may not seem to be very useful. But it can provide useful information, for both the new exerciser and for the recreational athlete. If you are just starting an exercise program, particularly a walk program, it can indicate if you are exercising efficiently. For the athlete, it can provide a measurement of aerobic capacity, called VO2 max, which traditionally has required an expensive laboratory test.