# HRi: Heart Rate Info app</p><p>1) Lets you compare hear-rate as measured by your watch's optical sensor vs an Ant chest strap.</p><p>2) Show traces of heart rate and cadence over about last 2 minutes.</p><p>3) Investigate HRV (heart rate variability) by looking at RR intervals. The app shows a measure of HRV (Heart Rate Variability) as ln of rmssd of RR intervals (root-mean-square, of successive differences).</p>
# HRV Dev Screen (disabled by default)</p><p>- HR from Ant HR strap: Current value and trace (in red)</p><p>- rmssd of RR intervals</p><p>- ln(rmssd of RR intervals)</p><p>- Info on number of good/bad RR samples when calculating rmssd of RRs.</p><p>- Status of Ant HR connectivity</p><p>- Traces of: HR from watch and Ant chest strap; RR interval; lnrmssd.</p><p></p><p># RR Dev Screen (disabled off by default)</p>
This app requires access to:
D2™ Bravo 
D2™ Bravo Titanium 
ForeAthlete® 235J 
ForeAthlete® 630J 
Forerunner® 235 
Forerunner® 630 
Forerunner® 735XT 
fēnix® 3, quatix® 3, tactix® Bravo 
fēnix® 3 HR 
fēnix® Chronos Kristian
30 December 2016 | Version 0.1.0-upd
This app crashes my FR 735XT causing it to restart having collected seemingly no useful data. I shall try it a few times more, although it would be appreciated if this issue were fixed....
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