I just started monitoring HRV over the last week. I have noticed that my HR is very low in supine (45-55bpm) compared to sitting (60-70bpm). Today I performed the test in both positions. My HRV was very different between the two positions. My HRV had been in the 80-90 for the last 4 days. Today my supine HRV was 101 but my seated was 60. I am confused as to what this means. I am thinking I should be performing my daily test in sitting. Any thoughts or insight from anyone? Thanks.
I'm been using HRV for about 2 months. I haven't had any difference in readings when I sit or lay down. My avg HR is 55-60 bpm. The key for me is to make sure my heart is in resting state. The first week I used HRV, my readings were very erratic because I wouldn't
wait until my HR was at resting. My preferred position is sitting in a chair, but I recline my seat back as well.
This is some information about taking HRV measurements standing vs. supine: http://hrvtraining.com/2012/08/27/supine-vs-standing-hrv-measurement-is-one-better-than-the-other/
I think the takeaway is to do it in the same position to ensure consistency. HTH.