What is the formula to determine 60 percent of heart rate reserve?
a. 220 - age x 60 percent
b. maximum heart rate x 60 percent
c. maximum heart rate - resting heart rate x 60 percent
d. maximum heart rate - resting heart rate x 60 percent + resting heart rate
Answer: d. maximum heart rate - resting heart rate x 60 percent + resting heart rate