Which HRR range corresponds to Vigorous Intensity?

• A. 60-89% HRR
• B. <40% HRR
• C. 40-59% HRR
• D. ≥90% HRR

Answer: (A)

Using heart rate reserve (HRR) to gauge intensity means you account for both resting heart rate and maximal capacity. HRR is calculated as HRmax minus HRrest, and the exercise target heart rate is HRrest plus a fraction of that reserve: THR = HRrest + (percent × HRR). Vigorous intensity falls in the 60% to 89% range of HRR because at this level you’re tapping into a large portion of your available cardiovascular capacity without pushing into near-maximal effort.

For example, with a resting heart rate of 60 bpm and a max heart rate of 190 bpm, HRR is 130 bpm. The vigorous zone would roughly be 60 + (0.60×130) = 138 bpm up to 60 + (0.89×130) ≈ 175 bpm. Lower ranges (below 60% HRR) reflect light to moderate effort, while approaching or exceeding 90% HRR aligns with near-maximal effort rather than typical vigorous intensity.