What is the recommended intensity range for high intensity interval training (HIIT) work intervals?

Question

BlackTom AI · Accepted Answer

HIIT work intervals are intended to push cardiovascular and metabolic systems near maximal capacity, so the target intensity for those bursts is 80–95% of maximal heart rate.

1) Relevant knowledge points and concepts
- Maximal heart rate (HRmax) is the approximate highest heart rate an individual can achieve and is commonly estimated as 220 − age for practical prescription.  
- HIIT alternates short bouts of very high intensity (work intervals) with lower-intensity recovery; the work intervals are typically in the “high” to “near‑maximal” range (vigorous to near maximal).  
- Exercise intensity zones: moderate (~50–70% HRmax), vigorous (~70–85% HRmax), and high/near‑maximal (~80–95% HRmax). Rate of perceived exertion (RPE) and lactate/VO2 responses also align with these zones.

2) Step‑by‑step reasoning
- By definition HIIT work intervals must be above the vigorous zone and close to maximal effort to stimulate maximal aerobic and anaerobic adaptations.  
- The commonly recommended prescription for HIIT work intervals is 80–95% of HRmax because this intensity elicits high cardiometabolic stress while still allowing for repeated intervals with recovery.

3) Calculation examples (intermediate steps)
- For a 30‑yr‑old: HRmax ≈ 220 − 30 = 190 bpm. 80% = 0.80 × 190 = 152 bpm. 95% = 0.95 × 190 = 180.5 ≈ 181 bpm. So work intervals would aim for ~152–181 bpm.  
- For a 40‑yr‑old: HRmax ≈ 180 bpm. 80% = 144 bpm; 95% = 171 bpm.

4) Why the correct answer is correct
- 80–95% HRmax places effort in the high/near‑maximal zone that produces the physiological stress (VO2max stimulation, high lactate, HR elevation) characteristic of HIIT work intervals. It balances intensity with the feasibility of performing multiple repeats separated by recovery periods.

5) Why the other options are incorrect
- 70–80% HRmax: typically vigorous but often too low to be classified as true HIIT work intervals; more suited to steady-state or tempo work.  
- 60–70% and 50–60% HRmax: moderate intensity zones appropriate for endurance training or recovery, not high-intensity intervals.

6) Conclusion
The recommended intensity range for HIIT work intervals is 80–95% of maximal heart rate, which matches the provided answer.

What is the recommended intensity range for high intensity interval training (HIIT) work intervals?Single choice

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