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Jul 2020
6:02pm, 31 Jul 2020
30,664 posts
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SPR
Highest June and July for me ever (both round the 170 mile mark) Just trying to get fit, plus no races to stay fresh for. Most of you will be over 200 though.
Just tested optical HR on 10 sprints, it failed woefully. If it's down to lag, there's still hope it will work for an 800m race as it'll have time to catch up. If it's down to arm movement then it's not going to work.
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Jul 2020
6:45pm, 31 Jul 2020
9,448 posts
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chunkywizard
SPR, make sure the watch is really tight if you want good optical. I always say one notch past comfortable! Loosen it off after the session.
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Jul 2020
7:02pm, 31 Jul 2020
17,025 posts
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Bazoaxe
I recko 800m is too short even for a chest strap as it takes time for the hr to get to the right level. Probably about a mile for me. Might be different for a proper 800m runner though that runs way quicker than me
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Jul 2020
7:34pm, 31 Jul 2020
30,666 posts
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SPR
Baz - What you describe is true lag, not strap lag. Your HR does take time to get the right level. I've used the strap for short intervals before so I know it works. Mine didn't move at certain points.
CW - I had it pretty tight specifically for that reason, I doubt tighter would have made much difference in this scenario. I did loosen it off after running due to how tight it was.
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Jul 2020
7:35pm, 31 Jul 2020
30,667 posts
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SPR
The intensity of a 800 race is different to the first mile of your X mile run as well.
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Jul 2020
7:42pm, 31 Jul 2020
9,452 posts
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chunkywizard
Ok SPR, sounds like it wasn’t that.
Just out of interest I looked at my HR for one of my quickest miles and it took my 1m30s to go above lactate threshold, ie just over 400m. I then stayed above it for the reminder, ending up at my max HR.
This was in 2015 so I probably had a strap on rather than optical.
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Jul 2020
8:03pm, 31 Jul 2020
30,668 posts
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SPR
This is my first 800m ever with strap from 2010 before I stopped wearing straps in races.
Never been sure about the 215 at the end but I definitely was dead in the last 100m (I think I still have a fear of going too hard in 800 races due to this race).
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Jul 2020
8:04pm, 31 Jul 2020
17,027 posts
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Bazoaxe
That’s what I meant SPR. I Doubt I have have much faster than 2:55 for 800m and I doubt if I could. I would not expect to be hitting a high hr for that although maybe after 6x 800 I may do.
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Jul 2020
11:28pm, 31 Jul 2020
30,669 posts
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SPR
Baz - You need the anaerobic power and endurance to get up to speed, which is something I guess you don't work on at all. It's something I could work on more myself!
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Aug 2020
7:38am, 1 Aug 2020
35,697 posts
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HappyG(rrr)
Ooh, I could still beat you in 800m 400m 200m 100m then Bazo? If we could just do a marathon like that footballer, 800m per day for 52 days could take you on at marathon too?! 
New (replacement) Garmin Vivoactive 3 seems to be logging HR better as well as the altitude it was repaired for. Interesting. G
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