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Aug 2017
1:19pm, 30 Aug 2017
682 posts
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J2R
Mine definitely gets lower as I go faster. For my fastest race this year, a 5K early last month, it was about 950 after the first mile (in the first mile my HR is always lower, even if I've done a reasonable warmup, and this is of course reflected in the beats per mile, which was 862 for the first mile of this race). By comparison, if I'm doing a leisurely training jog with my partner, at maybe 11 mins/mile or so, it may be around 1300. When I'm running by myself at my usual easy training pace it'll be something like 1050.
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Aug 2017
1:32pm, 30 Aug 2017
413 posts
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Brunski
Yeah definitely Larkim - I've only fairly recently got a reliable HRM so am struggling a bit to compare.
I may also be talking garbage as well. Here's a few recent runs.
Last Saturday Parkrun around a lake (got there late so minimal warm up):
1 5:34 5:34 143 (152) 796 93 (106)
2 5:56 5:56 151 (153) 896 93 (98)
3 5:52 5:52 153 (158) 900 93 (98)
Yesterday lunch (miles 2-4 only) Steadyish run @ around 7 min mile around a boating lake.
2 7:05 7:05 121 (125) 856 88 (123)
3 7:00 7:00 124 (127) 869 88 (94)
4 6:58 6:58 126 (129) 881 88 (96)
A few weeks ago I ran around another lake (the BPM is skewed a bit as I briefly paused the watch for a quick drink at 3/6 and a longer pause to grab and down a gel at 9 miles):
1 6:55 6:55 134 (143) 929 89 (96)
2 6:27 6:27 139 (145) 896 88 (94)
3 6:43 6:43 139 (141) 931 88 (90)
4 6:52 6:52 137 (140) 943 89 (91)
5 6:48 6:48 137 (143) 933 88 (91)
6 6:54 6:54 139 (144) 957 89 (94)
7 7:00 7:00 140 (144) 982 90 (94)
8 6:48 6:48 141 (144) 959 90 (96)
9 6:53 6:53 141 (144) 971 90 (94)
10 7:31 7:31 141 (146) 1044 90 (96)
11 6:51 6:51 143 (146) 977 91 (98)
12 6:56 6:56 142 (144) 986 90 (99
I'm not certain that I've dropped 50 beats per mile in a couple of weeks, but here's hoping!
Anyway - from all of this would someone please predict my marathon time? My max is 165 bpm and my watch says my threshold is 148 bpm, although I think it's anywhere 143-148.
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Sep 2017
9:35am, 1 Sep 2017
418 posts
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Brunski
I wish I could delete posts on here ^
Interestingly, or not probably, I ran an early morning tempo yesterday and I was up at/over my threshold for pretty much the whole 8 miles. The run came in a good 20-30 secs per mile slower than I'd have hoped to average - all round it was a real struggle and I was glad to end the run.
Could it be the early start and lack of a proper warm up? I guess I must have been running inefficiently to have a higher effort for less pace than I've seen before.
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Sep 2017
9:43am, 1 Sep 2017
686 posts
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J2R
FWIW, Brunski, my running's always crap early in the morning. My 5K and 10K PBs have both been set in early evening races, with much better times than I've ever achieved in the morning. It's a pretty common phenomenon, but some people are affected more than others.
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Sep 2017
9:44am, 1 Sep 2017
11,708 posts
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Chrisull
I love early mornings and hate evening races for which I'm tired and always get digestive issues.
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Sep 2017
9:48am, 1 Sep 2017
687 posts
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J2R
I would also add that I think any drop in beats per mile is likely to be on a timescale of months rather than weeks.
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Sep 2017
10:59am, 1 Sep 2017
30,238 posts
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GlennR
Not always. 
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Sep 2017
10:25am, 21 Sep 2017
1,941 posts
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steve45
My heart rate isn't currently matching my expected calculated pace; this has come on over the last two months with me now running at "level 3" bordering on "level 4" but when I'm only managing a pace I was doing at "level 2". Frustrating and I wonder if age has now cast its cloak over my VO2 (I'm 68).
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Sep 2017
1:39pm, 21 Sep 2017
706 posts
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J2R
I suspect age does not manifest itself quite as quickly as that, steve45. I'd be looking elsewhere for an explanation first.
Given the two month timescale, it's unlikely to be an infection which is the cause but that definitely has an impact, as I have seen myself in the last week, where I've come down with some viral cold-y like thing. The curious thing is that I noticed an impact on my heart rate before any other symptoms of infection. I went for a cycle ride and was puzzled by the fact my heart rate was probably 20 beats per minute higher than normal for the pace and perceived exertion. My partner, who is a doctor, said I was probably about to come down with something, and sure enough, later on that day I started to get the typical early stage flu-like symptoms. It was odd that I didn't feel ill at all while cycling, only later.
A week or so later and I have not yet recovered, but I've continued to do easy running (all below VT1), which has been slower than normal because my HR is still elevated somewhat, maybe 10-15 beats per minute.
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Sep 2017
12:36pm, 23 Sep 2017
1,946 posts
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steve45
Thanks J2R..still the same today and running at a pace I can manage fine (level 3) but really wanted level 2 for my ten miler. I 'll evaluate my pace/training because my faster paced days have been a bit modest (lazy!) and maybe the accumulation of not being so enthusiastic (!) about faster paced runs is a cause!
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