Z4 vs Z5 – Does it matter

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    In doing my run and swim intervals, is going into lower Z5 vs Z4 an issue.

    I typically find myself doing my 50 or less swim intervals a couple seconds into Z5. Similarly with some of my run intervals. I’m able to maintain them while going into Z5. Is this something I need to focus on not doing or is the higher intensity of the 20% beneficial?

    This is mostly an issue because my Garmin doesn’t track pace quickly or accurately on my 1 minute intervals and in a pool you’re just guessing your effort.

    Leyla Porteous

    With these short strong intervals it is good practice to use a combination of RPE and pace. When swimming RPE is essential – unless you are using form goggles that will give you real time pace and stroke rate. Same when running – there is just no way to see the pace until you have finished the workout. So if you are able to keep the intervals consistent and recovering well after your high intensity sessions I don’t see an issue with a slight drip into a higher zone. If these keeps happening it is a sign that you may need a retest or adjustment to your threshold paces.

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