<Dl> <Dd> Zone 1 (easy exercise): 180 − 50 ± 5 → 125 − 135 bpm </Dd> <Dd> Zone 4 (tough exercise): 180 − 20 ± 5 → 155 − 165 bpm </Dd> </Dl> <Dd> Zone 1 (easy exercise): 180 − 50 ± 5 → 125 − 135 bpm </Dd> <Dd> Zone 4 (tough exercise): 180 − 20 ± 5 → 155 − 165 bpm </Dd> <P> Heart rate recovery (HR) is the reduction in heart rate at peak exercise and the rate as measured after a cool - down period of fixed duration . A greater reduction in heart rate after exercise during the reference period is associated with a higher level of cardiac fitness . </P>

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