Sprint workout has tempo training effect

to gain anaerobic training effect you need to have short duration, quick increase of HR.
in my experience it's difficult to get (especially without using a chest HR strap which makes it even harder to detecting sudden HR variations)...

drkglb said:

to gain anaerobic training effect you need to have short duration, quick increase of HR.
in my experience it's difficult to get

To be precise, it’s difficult to get the numerical estimation for the anaerobic gain from short duration sprints. With or without a strap the heart cannot respond quick enough.

However, the physiological benefits will still be gained irrespective of whether or not a heart rate strap is worn. 

One more anaerobic workout recorded as tempo today.

6x 200m at 115% Vo2max (approx 3:30 min/km pace)
https://connect.garmin.com/modern/activity/7994792214

Maybe I did my recovery splits too fast (should have walked instead of jogged probably)
Still I find this a bit stupid because jogging very slowly instead of walking does not change the effective benefit of my training session.
I am really wondering what other data (recovery of previous runs?) is taken into account to calcluate anaerobic load.

yeah I've bought even the HRM-PRO to have more precise HR and have the same issue but where either they finish as Base or Tempo. Todays for example i have 2.8 Ae and 2.5 An I was hoping I will finally get a Anaerobic tagged workout for once since >6months but but no :( 
Maybe next time I will try to skip / walk the warm-up and cooldown  at leat in add to the anaerobic training load so at least that's good.

Get the anaerobic training effect to at least 3.0. That should do the trick. There is a widget that shows the TE as you go.

Is your target-type pace or HR for the workout?  As I said above, for me, switching the target type to HR helps.  This was Monday.  These were short (10sec) sprints, with 3min recoveries.  I have to walk the 'recoveries' to stay in the HR range.  Even SLOW running will push my HR up above the range it's expecting.

I uploaded a couple more.  So 1st shows Sprint 2nd shows laps associated with that workout.  3rd shows Anaerobic and 4th shows its laps.  Hope this is helpful. The 'sprints' themselves target a pace.  I just try to run a pace that will allow me to do a similar pace for every one.  The warm-up/recoveies/cool-down are all HR ranges I try to stay within.

Crap, one more edit. I accidently hit the lap key trying to exit out of something on the Anaerobic run so the first couple interval laps are goofy.

https://imgur.com/a/Dpgig0Q

Yeah, That's what i'm doing. I use HR target and i'm slowly walking between sprints to bring HR down as mu as possible(well today I did run a bit after 2dn sprint but kept HR in range). I also have a data screen showing efficiency on the go to keep track of it. What strange is that I've had the required 2.5 of Anaerobic efficiency and somehow it ended as base. I thought that maybe because i had 2.8 of Aerobic ( the target was also 2.5) that pushed it to base but you had 3.1 so i can't understand that. I will Need to figure out why it is happening. Thank's a lot for the tips i will try to compare my runs with yours

connect.garmin.com/.../8857701588

And, just an FYI, all of this crap can be super frustrating and the watch(es) are quite irritating at times.  I just got off nearly a full month of 'unproductive' runs.  Following suggested workouts, had me to a lactate threshold run (or tempo, but it triggered an update) and it lowered my HR by 2BPM from 165 to 163.  I accepted the new threshold, and that jacked up my HR zones just enough to make it so I couldn't run within the HR ranges w/o almost walking for a base run.  After a couple weeks trying to maximize efficiency, I turned off running HR zones, and manually put my LT back up to 165.  I haven't had a LT run since, but with the weather being warmer, I assume my HR will be higher.   I also think I'm going to go do an actual sports physical / test for V02/LT just to see how off the watch it to reality. 

Last Sunday I told myself if my training status remained unproductive I was gonna turn all of it off because it was annoying me so much.  And, the run came up "maintaining" and then 3 productive runs since haha.

PS, your privacy settings are not allowing me to see your activity.

hmm, strange i've made it a public activity... 

Hehe yeah the LTH params and HR zones play important role this calculations last year I was running only with watch and therefore my Zones were setup via HR Rest % and I also had to almost walk for base runs. Now with HRM-Pro it is much better i use zone with %LTH. I don't do LT run but my LTH is auto updating (up) every 2-3 weeks during the Threshold runs there for my Zone2 runs are faster because they allo higher HR now etc. so the "vo2max game" is good ;) but yeah when some params suck it is very frustrating. Also i'm wondering how much of "bad" effect the instant pace have because in F6 it is very not reliable.