In a separate thread Carl Watts suggested that rowing at 23 spm instead of let's say 19 spm (for the same pace) would give me a lower HR, so I gave it a try.
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Date DF Time Pace AvgHR
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04Jun 89 1:32:38.6 2:11.7 152
11Jun 91 1:32:33.9 2:11.6 150
18Jun 95 1:32:39.6 2:11.7 143
11 June I increased spm from avg 19.9 to avg 22.6.
18 June I kept the higher spm (avg 22.6), upped the DF a bit and (probably most important) I used a camelbak to drink (~200-250ml every every 15min).
Huge difference: the avg HR went down very significantly !
I recomputed the avg HR from stroke-by-stroke data and I got 151/149/143, so no tricks with HR at end of splits.
For the 3 sessions, temperature was basically identical (23-25C). 3 logs are here: 04Jun, 11Jun, 18Jun.
Guess I'm not rowing an HM without drinking again.
P.S.
Damn, I hate the camelbak (Hydrapak Force 3L) is such a pain to manipulate, clean and dry. I'm pondering something less annoying, like a small tank (maybe insulated) + the camelbak tube and valve. Ideas welcome
