Answer :
Answer: A 50-yr old man who weighs 193lbs and has a resting heart rate of 70 beats . min-1 wants you to help him calculate his target heart rate zone for 60% to 80% VO2R. Use the Karoven (heart rate range) method to do so.
The answer is;
130 to 150 bpm
Explanation: HRmax= 220-50 = 170bpm
HRR= 170-70 = 100bpm
60% HRR: 100 × 0.6 = 60
80% HRR: 100 × 0.8 = 80
Target HR = % HRR + HRrest: 60+70 = 130 and 80+70 = 150
HRR- Heart rate range
HR- Heart rate
HRrest- Heart rate rest
HRmax- Maximum heart rate
Final answer:
To calculate the target HR zone for a 50-year-old man using the Karvonen method, subtract his age from 220 to find the maximum HR, then subtract resting HR to get HRR. Multiply the HRR by 0.60 and 0.80 to find the target HR zone, which is between 130 bpm and 150 bpm.
Explanation:
To calculate a 50-year-old man's target heart rate (HR) zone using the Karvonen method, we first need to determine his maximum HR. This can be estimated by subtracting the person's age from 220. For a 50-year-old, this would be 220 - 50 = 170 bpm. To find the heart rate reserve (HRR), we subtract the resting heart rate from the maximum HR: HRR = 170 bpm - 70 bpm = 100 bpm.
Next, calculate the lower limit of the target HR zone for 60% VO2R by adding 60% of the HRR to his resting HR: Target HR Low = 70 bpm + (100 bpm × 0.60) = 70 bpm + 60 bpm = 130 bpm.
Then, calculate the upper limit for 80% VO2R by adding 80% of the HRR to his resting HR: Target HR High = 70 bpm + (100 bpm × 0.80) = 70 bpm + 80 bpm = 150 bpm.
Therefore, the target HR zone for a 50-year-old man at 60% to 80% VO2R, using the Karvonen method, would be between 130 bpm and 150 bpm.
