I have been trying a new version called Ithlete which is and itouch or iPhone app.
Many if the tests are done either during sleep or upon waking.
FirstBeat looks at sleep.
Polar a version of the Rusko test with combination lying and standing.
Ithlete looks at approximately 1 min standing test upon waking (it is actually 8 full breaths by following a controlled breathing pattern). There research shows that the lying portion of HRV testing isn't as accurate for people with resting heart rate below 50.
Below is a picture of my training week.
Ithlete showing orange today marks an easier training day or recovery in full.
I am going to Spiro then stretch today.
Will have to see how this plays out over time. Will keep everyone up to date.