In the 4 x 4 protocol, target intensity range?

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Multiple Choice

In the 4 x 4 protocol, target intensity range?

Explanation:
The main idea being tested is knowing the appropriate intensity for the high‑effort bouts in the 4 x 4 protocol. In this protocol you do four minutes of hard work, four times, with recovery in between. To elicit the cardiovascular and metabolic adaptations targeted by this HIIT format, the high‑intensity intervals should be performed at about 90–95% of peak heart rate. This level is strenuous enough to maximize VO2max stimulus and recruit fast‑twitch fibers, while still allowing you to sustain four minutes of effort. Lower ranges like 70–75% or 50–60% peak HR don’t provide the necessary stimulus to drive those adaptations, and aiming for 100% peak HR is typically not sustainable for an entire four‑minute interval. So 90–95% peak HR is the best fit for these four‑minute efforts.

The main idea being tested is knowing the appropriate intensity for the high‑effort bouts in the 4 x 4 protocol. In this protocol you do four minutes of hard work, four times, with recovery in between. To elicit the cardiovascular and metabolic adaptations targeted by this HIIT format, the high‑intensity intervals should be performed at about 90–95% of peak heart rate. This level is strenuous enough to maximize VO2max stimulus and recruit fast‑twitch fibers, while still allowing you to sustain four minutes of effort. Lower ranges like 70–75% or 50–60% peak HR don’t provide the necessary stimulus to drive those adaptations, and aiming for 100% peak HR is typically not sustainable for an entire four‑minute interval. So 90–95% peak HR is the best fit for these four‑minute efforts.

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