Kažkokia gaiduva su Garmin. Kaip žinome Garmin naudoja Firstbeat 
technologiją savo gaminiuose pulso, atsistatymo ir t.t. funkcijoms.

Firstbeat tinklalapyje skaitome:
"The device records R-R data and is therefore manually compatible with the 
Firstbeat ATHLETE software"
Šaltinis: http://www.firstbeat.com/consumers/garmin-heart-rate-monitors

Einame į Firstbeat e-parduotuvę ir ką gi randame:
"This product will be discontinued by the end of November 2015"
Šaltinis: 
http://shop.firstbeat.com/all-products/firstbeat-athlete.html#.VktzKeKW68E
Pranešimas dėl ATHELETE palaikymo nutraukimo
http://www.firstbeat.com/news/news/firstbeat-athlete-discontinued

Dabar skaitome, ką siūlo "dinozauras" Polar V800:)
"R-R Recording
R-R recording rate saves heartbeat intervals, that is, intervals between 
successive heartbeats. This information is also shown as instantaneous heart 
rate in beats per minute in recorded samples.With RS800CX and CS600X you can 
analyze your heart rate variability (HRV) using the ProTrainer 5 software 
with an accuracy of 1 ms. With V800 you can analyze it at the Polar Flow web 
service. "
Plačiau, jei kam įdomu, kas tas R-R: 
http://www.polar.com/en/support/heart_rate_variability_hrv