New blog post comparing three ways to measure respiration frequency during training:
direct measurement with Tymewear
indirect estimation from HRV (chest strap)
Breeze (headphone microphone)
Key takeaway:HRV-based respiration frequency works well enough for threshold validation and durability monitoring, which are the two things we actually use it for (will use for durability). Research shows accuracy holds through ~42 breaths/min, covering everything up to and beyond VT2 for most athletes.
If you already wear a Polar H10 or Suunto strap for DFA alpha 1, you’re getting usable respiration data for free with AI Endurance.
We’re also building toward using RF drift alongside heart rate and DFA alpha 1 as a field-based durability marker, measuring how your internal effort rises relative to our external output as long sessions progress.
Early days, but the research direction is promising. Full details in the blog post:
Thanks for the post, I was wondering if the RF coming from high end Garmin device was sufficient after seeing the Tymewear annoncement. Sidenote, 475$ for a chest strap and 150$ subscription, really lol?
Subscription is optional (there’s a small button at the bottom that says ‘I don’t want a membership plan - proceed to checkout’), but it’s still $475 plus $68 in shipping. Oof.
I’ve also found the Wahoo TRACKR HR to be really good on collecting HRV data with low artifacts - and really good just in general. The TICKR series was trash, but the sensor in the TRACKR HR is really nice.
I found the Coospo H6 to be very good. Dual ANT+ and Bluetooth so it supports dual-recording using AlphaHRV and normal Garmin recording, strap is replaceable and costs $10. Battery is a CR2032 and lasts for months, tool-less too (YMMV, regulations). Mine has lasted 2+ years.
Todays workout had a total artifact percentage of 0.13% and local artifact percentage of 0.09%.
