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what makes a chest strap HRM swim specific
It stores the data on the strap, and transfers to your watch / whatever else at the end of the swim.
There are no, IIRC, swim straps that can transmit live HR data, as Bluetooth / ANT+ / everything else all attenuate so much through water.
The Garmin swim strap works outside of water as a normal HRM strap.
I'd suggest that an optical wrist sensor is good enough for anything you might need it for, running-wise.
NotThamesWater
Good news from Physio - reckons knee problems are nerve related rather than tendon or muscle, which means less need for rest/stopping. Hopefully stretching will help and I'll be back up to speed soon. Think it was wearing a daft pair of very minimal trainers that have caused the problem.
Managed to race on the weekend - sneaking into the top 20 at Bingley Show Fell Race - a 10km/300m trail run. Ran almost the exact same time as two years ago, and was beaten by my friend on his first ever fell race, but felt happy that my knee held up (even if it was sore after). Just crossing my fingers that I can return to training in time to do the Ben race in 6 weeks.
Also, can anyone help recommend a HRM strap for pool swims and running? I'd like a chest HRM for the pool, but I'm also keen to see how wrist based hrm compares to a chest strap (I'm having my doubts about the accuracy of wrist based HRM). Although maybe it doesn't matter. I'm just a bit confused as to what makes a chest strap HRM swim specific and if I can get dual function out of one. FWIW, I'd be totally happy knowing that a regular HRM would do the job in the pool, but that I'd need to replace the fabric strap more often.
Edit: https://www.dcrainmaker.com/2015/11/garmin-hrm-swimtri-review.html
Reading that was helpful, but essentially the swim HRM for pool swimming exists for a reason, and very annoyingly the straps aren't interchangeable.