It was very humid today, even for me. Think I’ll hike, not run tomorrow. Time on feet etc etc 
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how long were you planning to be out there???
It certainly can increase fatigue through being less efficient…
a whole day coaching in the sun and I’ve just taken a refreshing dip…and am now shivering…
I think I’ve overcooked it…
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Today should have been a 6 hour progressive ride, was 38C by time I got 2.5 hours in so eventually binned it when I was meant to start laying down some power.
For me this raises a huge hydration challenge. My running sweat rate even in ~25C is about 2L an hour at Z2-3 efforts, with high salt too. Don’t have accurate bike data, but starting to believe it won’t be much lower.
My understanding is that maximal fluid absorption is ~1L/hour at rest, and same up to moderate exercise (70% VO2M ~~ 80% HR) before it tails off.
I wonder if this is one of those areas like CHO intake where some people are able to adapt to go a little higher than what the studies say.
I’ve heard Andy Blow say they’ve seen intakes of 1-1.5L per hour at Kona (Nutrition and hydration data from Kona and 70.3 Worlds with Andy Blow | EP#365)
Today I managed about 7L over 5 hours elapsed time and felt fine - couple of moments of feeling a tiny bit full and once had a tiny burp/regurgitation (sorry) but that was after drinking 1L in one go at a stop inc 600ml milk, and I felt dry and thirsty within another 15 minutes of riding.
Generally I’ve got a decent stomach so wouldn’t worry about overdoing it and feeling full or sick, same with food intake, but no point taking in more than is getting used. Especially with the run afterwards
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Their company seems to be doing very well…he is/was a good athlete and coach…
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One of the guys here is tracking core temperature. I don’t know how- will ask him next time I see him
This was from his run today
I was doing some lab testing once and they wanted to check my core temperature, when I found out it involved sticking something in a place I didn’t want to stick it I said no 
They said they could do without it 
Although I gather there’s some you swallow and eventually it reappears 
Not sure if they’re reusable though 
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Science says BF% doesn’t affect core temp in the heat/exercise significantly - super counterintuitive, neither does hair length…
I was going to say core temp is surely a probe up your arse. Bet that’s fun while cycling / running!
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You can get pills you swallow for 20 days, far from cheap
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“Set a new PB today. Couldn’t wait to get home and yank the probe out”
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I wonder if they fall foul of the same rules that don’t allow you to have externally mounted implants in competition.
Resurrecting this one.
On Sunday my HR was pretty high on the run but I’d done the swim and bike by then, started around 4:50/K and finished nearer to 5:10/K but averaged 5’s.
HR average was 160 but often around 165, it was hot though and more than I’ve been used to this year. It felt hard. Strava weather only reckoned 18c though which definitely wasn’t right.
This morning it was at least 20c but I only did 6K at around 145bpm which is about normal for the pace which was around 5:20/K which was partly due to trying to follow the route on my watch.
Quite a bit was covered as well.
Probably fresher but I’m not sure I’ve acclimatised that quickly? I guess the sun strength and race dehydration probably both impacted things?
Think I saw GB struggled today?
I’ll see how things compare on Sunday.
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Yesterday mine was, but yeah i was shite.
I think it’s because we just haven’t had any warm weather all spring to start that acclimatisation process. And for me, i was running ‘normal’ effort whereas i probably should’ve just backed off.
Is it humid there as well? Dehydration was surely a factor for you af the end of the 70.3. I think they say you can get pretty quick adaptations though. Have a few really hot baths for the next couple of days (not your water bill!!!)
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I know what you mean about this. Have experienced various hot conditions over the last year, and would say that for me running at sunset in June at 6pm and 40C heat feels somehow easier than running in full sun in March at 10am and 30C.
Also a bit of wind makes everything nicer
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Puts our 22-28c into context
I really struggled a couple of days ago in the heat. Today as it’s cooled down a bit and a lot less humid was so much better.
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I’m really appreciating the significance of humidity at the moment.
The heat here in August is quite high, the 24 hour range has been 34-43 C. But the humidity has been really variable. Earlier in the week it was down at 20% and riding felt great, even in 40C.
Just been out now at sunset , temp was 35C and so I thought it would be OK for a short trot after work.
But it felt really hot, slow and soupy, when I got back checked on weather app, humidity has risen to 70% which gives a “feels like” temperature of 48C.
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I went for a jog last night, left at 9 when it was just about dark. Temp was around low 30s but the humidity at around 70%. Sweating buckets after around 15 minutes. It’s such hard work. Going to change tactics tomorrow and go for an early riser and see how it feels
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Yeah I’m now struggling when I attempt to run with feeling clammy and it hasn’t even been hot here, clearly got used to much drier conditions which felt more comfortable even if >10C warmer
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