Q.Using the standard estimate HRₘₐₓ ≈ 220 - age, the estimated maximum heart rate of a 17-year-old student is:

The formula provided is HRₘₐₓ ≈ 220 - age.

For a 17-year-old student, substitute age = 17:

HRₘₐₓ = 220 - 17 = 203 bpm

This is a straightforward application of the age-predicted maximum heart rate formula, widely used in exercise physiology and fitness testing to estimate the upper limit of cardiovascular capacity during maximal effort.

Why the other options are incorrect:

• (a) 183 bpm would correspond to an age of 220 - 183 = 37 years, not 17.
• (b) 193 bpm would correspond to an age of 220 - 193 = 27 years, not 17. …

The Maximum Heart Rate Formula

Maximum heart rate represents the highest number of beats per minute your heart can achieve during all-out physical exertion. It is a physiological ceiling that declines predictably with age as the heart's intrinsic pacemaker cells slow and cardiovascular elasticity decreases.

The standard age-predicted formula is:

HRₘₐₓ = 220 - age (in years)

This estimate is used worldwide in exercise prescription to set training zones. For example, moderate-intensity aerobic work is typically prescribed at 60–70% of maximum heart rate, while vigorous intervals might target 80–90%. Knowing your maximum heart rate allows you to calculate these thresholds without performing a dangerous all-out test.

Calculation for a 17-Year-Old

Substitute the age directly into the formula:

HRₘₐₓ = 220 - 17 = 203 bpm

The estimated maximum heart rate is 203 beats per minute.

Why the Other Options Are Wrong

1. 183 bpm would correspond to a 37-year-old (220 - 37 = 183). This underestimates the maximum for a teenager, whose cardiovascular system is at near-peak capacity.
2. 193 bpm would be the estimate for a 27-year-old (220 - 27 = 193). Again, this is too low for someone in their late teens. …