Using the formula HR max = 207 - 0.7 x age, what is the HR max for a 40-year-old?

Using the formula HR max = 207 - 0.7 x age, what is the HR max for a 40-year-old?

• A. 178
• B. 186
• C. 179
• D. 190

Answer: (C)

Estimating maximum heart rate with this formula shows how age-related changes are accounted for in exercise planning. For a 40-year-old, multiply age by 0.7: 0.7 × 40 = 28. Subtract that from 207: 207 − 28 = 179 beats per minute. This value represents the upper limit to guide workout intensity. Other numbers don’t fit the same calculation for a 40-year-old: 178 would require a slightly larger subtraction (29), which would imply a different age or rounding; 186 or 190 would require much smaller subtractions, corresponding to younger ages (not 40).

Estimating maximum heart rate with this formula shows how age-related changes are accounted for in exercise planning. For a 40-year-old, multiply age by 0.7: 0.7 × 40 = 28. Subtract that from 207: 207 − 28 = 179 beats per minute. This value represents the upper limit to guide workout intensity.

Other numbers don’t fit the same calculation for a 40-year-old: 178 would require a slightly larger subtraction (29), which would imply a different age or rounding; 186 or 190 would require much smaller subtractions, corresponding to younger ages (not 40).