Heart rate
301 watchers
Jun 2017
2:50pm, 9 Jun 2017
2,176 posts
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larkim
Surely that logic only holds to a point though? If you accept that HR drift from a certain point in time is inevitable, it would mean that for an ultra runner they would be guaranteeing hitting close to 5k HRs by the end if they paced things correctly, which I'm sure isn't the case. Or to put it another way, can you stop drift though cooling / hydrating? And where does drift max out at? Maybe in Steve's case (his fetch log of it is here btw - fetcheveryone.com/t-13850232 ) he benefitted from the first chunk of the race being up hill, so the "benefit" of the flatter (!) section in the second half of comrades allowed him to actually be putting in a lower effort overall for the same heart rate but also a consistent pace? |
Jun 2017
2:51pm, 9 Jun 2017
28,200 posts
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GlennR
Here are my stats from that half marathon, in case they're of interest. You can tell where the ups are on the route from the occasional rise in heart rate. Those of you who can run at a decent pace can adjust for your own similar numbers. Split Summary ==== 1) - 0.03m - 58(30:25/m) - 87bpm avge - 110bpm max - 2cal 2) - 1m - 9:36(9:36/m) - 142bpm avge - 162bpm max - 137cal 3) - 1m - 8:19(8:19/m) - 141bpm avge - 155bpm max - 139cal 4) - 1m - 8:29(8:29/m) - 144bpm avge - 147bpm max - 140cal 5) - 1m - 8:50(8:50/m) - 147bpm avge - 152bpm max - 139cal 6) - 1m - 8:28(8:28/m) - 145bpm avge - 153bpm max - 141cal 7) - 1m - 8:17(8:17/m) - 146bpm avge - 152bpm max - 139cal 8) - 1m - 8:25(8:25/m) - 145bpm avge - 147bpm max - 140cal 9) - 1m - 8:27(8:27/m) - 145bpm avge - 148bpm max - 139cal 10) - 1m - 8:45(8:45/m) - 148bpm avge - 152bpm max - 141cal 11) - 1m - 8:28(8:28/m) - 149bpm avge - 151bpm max - 139cal 12) - 1m - 8:20(8:20/m) - 148bpm avge - 151bpm max - 139cal 13) - 1m - 8:19(8:19/m) - 150bpm avge - 152bpm max - 140cal 14) - 1m - 8:09(8:09/m) - 150bpm avge - 155bpm max - 140cal 15) - 0.15m - 1:01(6:59/m) - 157bpm avge - 160bpm max - 19cal |
Jun 2017
2:52pm, 9 Jun 2017
565 posts
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J2R
SSLHP, I find that cardiac drift thing doesn't happen to me, at least not in half marathons, which is the furthest I've raced since starting to use a heart rate monitor. I tend to get up to a heart rate of 87-90% after a couple of miles and then stick there, except for a little surge at the end with a finishing sprint.
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Jun 2017
2:56pm, 9 Jun 2017
13,742 posts
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Dvorak
Given how nearly everyone posts positive splits in a marathon, often massive ones, perhaps that could be used in one's favour by starting at below target heartrate which allows for it drifting up to that. Which, SSLHP, you might view as building underperformance and I'd view at sensible pacing. Based on me, I reckon that for every second I run too fast in the early part of the race, I'll lose two in the latter part. All complicated by the fact that raceday HR tends to a few beats higher for the same effort than training HR. |
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Jun 2017
3:02pm, 9 Jun 2017
2,177 posts
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larkim
A few beats higher for the same effort than training? I find the opposite, with training effort (for which I'm subtituting pace) able to be achieved for a few beats less in a race? Or am I misunderstanding?
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Jun 2017
3:08pm, 9 Jun 2017
556 posts
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Dillthedog57
I find the same Larkim, my race heart rate tends to be a bit lower. Especially once I get past the nervous start!
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Jun 2017
3:34pm, 9 Jun 2017
2,178 posts
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larkim
I usually put it down to the positive impact of a taper / rest. Because I'm usually buzzing with adrenaline and caffiene at the same time!
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Jun 2017
3:44pm, 9 Jun 2017
273 posts
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SSLHP (Shoes smell like horse piss)
I never use HR in a race so don't have those stats, but I do use it in aerobic marathon training and I can keep my HR constant for about 10 -12 miles then it starts to creep up for the same pace/effort (from, say 136 to 139/140) over the next 8-10 miles. I know in the P & D book they say that if using HR, to start of at the lower end of your zone to allow for the drift later on. I don't know, but I would guess that the elites who run pretty much a constant pace throughout a marathon have a HR higher in the last miles compared to the early ones. |
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Jun 2017
4:01pm, 9 Jun 2017
557 posts
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Dillthedog57
If your heart rate doesn't go up near the end, you aren't trying hard enough!
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Jun 2017
6:15pm, 9 Jun 2017
45 posts
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Training Log
I have neg'd my last 4 marathons using a heart rate monitor. First half <85% then let it rise as pace starts dropping off soon after. True max is a shade over 200 mark but can not get it over 185 without a silly effort at the end of a marathon. |
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