Mean (± standard deviation) time (s) spent in the four zones of heart rate reserve for the first and second sets of nonplaying and playing high intensity interval training sessions (n = 7).

<p>* Training session effect with * for p≤0.05, and ** for p≤0.01.</p><p>† Set effect with † for p≤0.05.</p><p>Mean (± standard deviation) time (s) spent in the four zones of heart rate reserve for the first and second sets of nonplaying and playing high intensity interval training sessions (n = 7).