Heart Rate Variability Logger 4+

I bought this to try and use it for the DFA-alpha1 testing of aerobic threshold but have also adopted using it for morning HRV logging. The morning logging is going well but the logging during runs has a fundamental flaw. Twice I have set out with everything running as required, but my phone in my waist belt so not visible to me. On return from the run I find the logger app is sat waiting for me to select the BT HR monitor, as though a drop out occurred at some point. Consequently most of the test run is wasted. My other running app, iSmoothRun, handles this fine since it has a setting to tell it which sensor to use at all times. This logger should do the same, whilst recording, if it has a drop out it should try and pick up the same sensor. Without this I cannot rate the app higher. It was not a cheap app.

Have been using this app over the past week to assess the reliability of using the DFA (alpha 1) metric to locate the Aerobic Threshold (aka ... VT1, LT1) for my athletes at Tri-High Performance. I have only been using a basic Bluetooth chest strap rather than the polar strap that HRV4TRAINING recommend to see if could be rolled out at minimal cost. When used indoors on a bike trainer or treadmill, I have found that a DFA (alpha 1) reading of 0.75, has consistently coincided with around 85% of Lactate Threshold Heart Rate (as determined by the final 20 minute HR of a 30 minute TT). This would certainly correlate very well with established AeT heart rate estimates. To support this, intensities that produce readings above 0.75 have always felt very ‘conversational’ , and intensities that produce values below 0.75 have always felt less than ‘conversational’. I this metric will prove to be a reliable resource to endurance athletes everywhere. I have had issues using it outdoors over variable terrain, but in a controlled environment - it has so far provided me with what appears to be an extremely useful assessment of heart rate at the aerobic threshold.

Great idea but I can't even connect to my Polar H7 HRM... Not good!