Fenix 5X HR in zone 5 always during a jog

Former Member over 5 years ago

Hello Everyone !

Greetings. I have been using Garmin products for a long time, but bought a Fenix 5X recently and have started running with it, along with a chest strap.

I have noticed my every run, even in a light jog I hit zone 5 and eventually max HR. I did manage to jog for 20 minutes in zone 5 but my VO2 max dropped by 2 points in

single run. Which lead to a training status of unproductive,

Is it normal? Has anyone experienced the same? As per garmins description training in zone 5 should build endurance and strngth. Then why do i get lower vo2max?

After several days of training in zone 5? I'm just curious.

PS:I did take good nutrition and gave a day or two off between the runs.

Thanks

0 Former Member over 5 years ago in reply to subra

I think its highly unlikely for the VO2 max to drop by two points in one day. As I have been working out every week. Giving adequate rest and nutrition to the body. My Garmin vivosmart 4 still gives the same VO2 max when tested. Training status was showing between maintaining, productive and recovery but now all of a sudden unproductive.

I had set max HR to 182 which was based on 220 - age formula, auto detect was on. But the watch never detected Max HR. Performance notifications are on too.

May be its possible that I'm not fit enough to run, as I'm bmi 34.

"This means, if you "jog" slowly it's submaximal running and the calculated VO2max drops also." This is possible too.

Anyways ill try out what you said

0 Former Member over 5 years ago in reply to Daniel_Ilg

Should I use my last weeks avg resting HR?

0 Former Member over 5 years ago in reply to RonHi

I am using the watch for about 3 months and chest strap for a month. I record 3 runs a week and 2 weight training sessions. That drop you mentioned, happened as soon as i started using chest HR. As the watch's wrist based HR was very inaccurate. That time my VO2 max dropped by 4 points and that was understandable.

0 Former Member over 5 years ago in reply to subra

Also, all this while i was doing interval running(during which i got good training scores) and now started continuous jogging.

0 subra over 5 years ago in reply to Former Member

now started continuous jogging.

Maybe these are the reasons.

WHR usually measures lower HR than chest strap. If the HR is lower for the same speed, the fitness is higher and vice versa.

From my experience interval training (max. speed) rises VO2max and a long jog (submax. speed) lower it. It's mainly a matter of the speed.

0 Daniel_Ilg over 5 years ago in reply to Former Member

I would use your lowest RHR of the last two weeks (just the lowest not average) unless it's an outlier. Then go for the average.

Set top of zone 2 @ with this link: https://philmaffetone.com/180-formula/

Set Zone 1 at 90% of top of zone 2.

As mentioned set top of zone 3 @ LT and top of zone 4 is LT x 1.1. The rest is zone 5.

Good luck!

0 Daniel_Ilg over 5 years ago in reply to Daniel_Ilg

And happy to hear back :-)

0 Former Member over 5 years ago in reply to Daniel_Ilg

Thanks guys ! Appreciate all your inputs and time