My n=1 observation - have been doing weekly water runs since my ankle arthritis is flaring up.
I typically do short intervals as hard as possible with water running, anywhere from 1-2 mins, to longer ones at 3-5 mins. HR and breathing go sky high with the high leg turnover and glute drive, higher than it does for my swim intervals (because I'm a MOP triathlon swimmer and I run/bike a lot better than I swim)
I can say for sure, in that for my n=1 experience, the breathing agony I get while water running directly translates over and improves my comfort breathing while doing hard swim intervals. In contrast, my out-of-water treadmill/Zwift hard interval breathing does NOT seem to translate at all to improved swim breathing comfort.
My hypothesis for now is that the hard water running is letting me adapt my breathing muscles to the large push forces of the water on the ribcage that make you work harder to inhale in the water compared to out of the water. The water running eliminates the swimming problems of getting more O2 (stroke rate matched to breathing as well as technique limiters in swimming), and thus you can really start to acclimate breathing at very hard efforts while in water. I def felt fatigue in those inhalation muscles the first few times of hard water running!
Again this could be totally wrong, but just thought I'd throw this out there for some food for thought in case anybody else is crazy enough to try it.
I typically do short intervals as hard as possible with water running, anywhere from 1-2 mins, to longer ones at 3-5 mins. HR and breathing go sky high with the high leg turnover and glute drive, higher than it does for my swim intervals (because I'm a MOP triathlon swimmer and I run/bike a lot better than I swim)
I can say for sure, in that for my n=1 experience, the breathing agony I get while water running directly translates over and improves my comfort breathing while doing hard swim intervals. In contrast, my out-of-water treadmill/Zwift hard interval breathing does NOT seem to translate at all to improved swim breathing comfort.
My hypothesis for now is that the hard water running is letting me adapt my breathing muscles to the large push forces of the water on the ribcage that make you work harder to inhale in the water compared to out of the water. The water running eliminates the swimming problems of getting more O2 (stroke rate matched to breathing as well as technique limiters in swimming), and thus you can really start to acclimate breathing at very hard efforts while in water. I def felt fatigue in those inhalation muscles the first few times of hard water running!
Again this could be totally wrong, but just thought I'd throw this out there for some food for thought in case anybody else is crazy enough to try it.