I’ve done 3 weeks of 3-4 sessions a week (usually after a swim) building from 15 to 20-25minutes a couple of times to try and adapt.
My measure (albeit a mix of objective/subjective) was how my power/hr/pace/RPE mix was on runs and rides in the heat. My expectation was that it should shift back to ‘normal’ after heat adaptation.
I have a suspicion that actually exercising in the heat (I don’t mean in a sauna ) is far more effective. You also need to adapt your training programme to take into account the extra stress of the heat training.
Approach and timeframes certainly seem appropriate.
I’m not sure I’d ever say doing the sauna method will end up meaning your HR will return to “normal” during a one-off type run in extreme heat (that’s still going to be a shock to the body), but the additional plasma volume in your blood should help you cope. There probably is no perfect substitute for just living and training in the heat.
The measure I was talking about was more related to the actual immediate response in the sauna. My experience is that after a couple of weeks, the HR ramp I see initially in short sauna sessions doesn’t occur even when I’ve been in there for much longer. That is the key indicator (for me), that I’ve had a plasma volume response that has led to my body being able to regulate itself better within the confines of the sauna.
The way the KQ guy from my club described it to me is that you should just get out once your HR starts to really spike, even if not long has passed. It might initially only be a few minutes. Over time, that duration will begin to extend.
Maybe by just getting in from the off and doing 15mins, and effectively fighting through the final 10mins, detracts from the adaptation as the body gets overly stressed. I don’t know, I’m just hypothesising based on the approach I was advised of.
The complication with sodium intake is you need to be careful you don’t overdo it on race day. If you overload the stomach with sodium, you’ll risk getting reverse osmosis and the stomach leeching water out of the bloodstream to dilute the sodium concentration. Which then just dehydrates you more in the short term.
It’s why I keep saying to myself I should get the proper PH sweat test done, to be more informed. But I’ve had such improved performance with PH1500 that whenever it comes to it (at various expo’s) I can’t justify spending the £75-100 to likely just be told I’m already on the right track. Every indication I have is that I’m a massively salty sweater…
I’ve been looking at my power file for IMCH which includes a temp record. My power tailed of almost directly inline with the temp rise of 15°.
I was looking for just a ‘general overdoing it’, but my IF at the start was on target at .69 - .7 , I didn’t beast the hills, if anything I took it too easy on the descents which gave me a high VI.
As I was faffing with speed/power overlays I hit the temp overlay by mistake and sure enough, right when I felt my power ebb, and when the avg power drops suddenly, corresponds with the sudden temp rise.
In hot conditions, I don’t enjoy running in a tri-suit: I suspect that tri-suits dry exceptionally quickly, while running clothes, are both looser as well as retain some moisture, so you can keep wet and cooler for whole run
I’m not so sure. I imagine it’s all personal. I would hate to run in anything not particularly tight fitting. I prefer that, and train in such tops 99% of the time. Largely because of nipple chafing issues as much as anything!
I also actually don’t like the fact running vests retain moisture. I was very ill at London marathon, and sweating profusely. My club running vest (and I have a good one, not just the basic one that is less breathable - which I also have) just got excessively heavy.
Maybe it helps I currently use the fairly breathable compressport TR3 Aero top. It’s is full of little mesh holes in varying patterns. I was considering making the move to a proper aero one-piece trisuit, given the gains they’re meant to provide, but this had made me think. Maybe that’s part of the reason Matt preferred changing for the marathon at Hamburg, versus staying in his nopinz suit?