Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): When using the Karvonen's formula, the exercise heart rate is higher than when using the maximum heart rate alone for a 40 years old male having a resting heart rate of 80 bpm.
Reason (R): Karvonen's formula is based on the heart rate reserve which is the difference between the maximum heart rate and the exercise heart rate.
In the light of the above statements, choose the most appropriate answer.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

HRR = Max HR − Resting HR Karvonen gives more individualized (often higher) target HR

Answer 1

The Correct Option is C

Concept:
Karvonen formula is used to calculate target heart rate (THR) using heart rate reserve (HRR). The formula is: \[ \text{Target HR} = \text{Resting HR} + (\text{HRR} \times \text{Intensity}) \] Where: \[ \text{HRR} = \text{Max HR} - \text{Resting HR} \]

Step 1: Understanding Assertion (A).
For a 40-year-old: \[ \text{Max HR} = 220 - 40 = 180 \, \text{bpm} \] Resting HR = 80 bpm Using Karvonen:
• Incorporates resting HR
• Produces higher target HR compared to simple percentage of max HR Thus, Assertion (A) is correct.

Step 2: Understanding Reason (R).
The reason states HRR is: \[ \text{Max HR} - \text{Exercise HR} \] This is incorrect. Correct definition: \[ \text{HRR} = \text{Max HR} - \text{Resting HR} \]

Step 3: Conclusion.

• Assertion is correct
• Reason is incorrect \[ \boxed{\text{Assertion is correct but Reason is incorrect}} \]