Guidance on Heart Rate Zones - Fenix 6 Keeps Telling me I'm Unproductive

Just looking for some guidance or other experience.

Background - I'm 43, do a mix of elliptical, running and cycling. RHR is in the mid-40s (currently 46, but generally 43-48 for almost a decade now).  I was obese growing up, lost weight 20 years ago, and then went vegan and got very dedicated and consistent with fitness in 2011. Done century rides, marathons, and lots of shorter distance stuff. Almost never missed a day of cardio in a decade. I've definitely slowed down in the past year due to a few things (hip injury), but still going, sweating, breathing hard and maintaining my weight and ability to push power.

It seems like no matter what I do, my watch/Connect generally tells me I'm unproductive or maybe maintaining.  And this actually pre-dates the slowdown I mentioned above, including happening in a time when I was doing regular sprinting interval runs (4-6 miles total, w/ 4-6x 1min sprint/2min recovery) on top of plenty of other daily cardio and weight work.

I just did an interval run with all out sprints, and it still said zero anaerobic effect. I was in Zone 4 and even Zone 5 for about a quarter of the time.  Before that, I did 40 min of cycling on the trainer (in 90 degree heat!) with some climbs, and HR getting into the 150s a couple of times, with an average of 136 (Zone 3 for me).

I'm not looking to cheat on the Zones just so it tells me I'm doing justice to my training, but I'm super frustrated to see that a genuine effort doesn't seem to matter, and think my zones are just not right. It takes a lot to get my heart up over 140, so a 155-165 HR effort is a good clip for me (feels like when I'd get to the 170s/180s a decade or two ago). My cardiac condition is something I'm proud of, but it seems like it's working against me on Connect, which is just weird.

I played around with them recently, going from %MaxHR (202, according to Garmin) to %LT (167, per Garmin), which set them all too high for me (like Zone 2 was up around 160, which is def not true).

Right now, I've set:

Z1 - 92bpm / 55%
Z2 - 105 / 63
Z3 - 125 / 75
Z4 - 142 / 85
Z5 - 155-202 / 93-121%

What do you all think? Based on effort, this feels right to me, or more right than the MHR settings, but still doesn't seem to matter for training effect, which doesn't seem right.

  • Ignore it.  It will say unproductive if it doesn't think what you did increased your VO2Max. It's a constant joke on Reddit that we work our butts off and get told how unproductive we are.

    Don't sweat it.  You're out there training, what more can you ask for? Keep it up!

  • Hello 

    In my experience using the MHR settings has worked well, you can give the benefit of the doubt to this comment and suggestion, try to use the following HR zones:

    Z1  112 -125

    Z2  125 -138

    Z3  138 -152

    Z4  152 -165

    Z5  165 -178

    Try to set your watch firmly 1 1/2 inches above the wrist bone, and do this three workouts:

    the first of them keeping you stricly in zone 2 (easy run) (30-40 minutes),

    get rest and the next day, the second workout can be a 30-40 minutes tempo run in zone 3 (with shorts peaks in zone 4),

    get rest and next day, the third of them another easy run keeping you stricly in zone 2.

    All this to make sure your watch is reading your HR correctly, hopefully it will work for you, and you can see "productive" on training status.

    it is also important to remember that rest allow the assimilation of training, if your HR takes a long time to rise, it may be an indication that you are not getting enough rest, and perhaps for that reason it indicates "unproductive" or just "maintaining" on training status.

    PD. for this HR calculation, I considered your resting HR and your age to get an estimation of your HRmax, then to estimate your HR zones I was using the Karvonen method. sorry for this translation, english language is not my native language.

  • Preach!

    you’re probably right. I mean, that’s what I’ve been doing essentially, but figured it would be good to get it setup right so it’s accurately analyzing what I’m doing. 

    I figure, I have a Fenix, not an Apple Watch. I paid for a much higher level of capabilities for training for a reason. 

  • Super helpful guidance, Fercho Pena. Thank you. And I think I need to bring more rest into the equation. I was better about that when marathon training because it was in my plan. Now, I’m not sleeping enough or taking time off. Good reminder - thanks!!

  • Heart rates zone are irrelevant - you MUST make sure your MaxHR is correct - if its too low, you will / may see Unproductive as your watch will think your pace / HR ratio is too low for your Vo2Max aka run / ride was 'Unproductive'

    Zones are purely for visualisation purposes and do not impact Training Status. Make sure MaxHR is correct and generally everything will work well.