W.A. Chalela, R.B. Fukushima, F. Araujo, A.C.P. Lima, P.J. Moffa and A.J. Mansur. Treadmill exercise testing of asymptomatic men and women without evidence of heart disease.
Figure 1. Mean heart rate recovery in the 1st and 2nd min after exercise relative to age and gender. (Student t-test).