http://www.myithlete.com/getting-the-most-from-ithlete/rss http://www.myithlete.com/getting-the-most-from-ithlete/show/26?start=0#post27 <p>Hi Tunney, thanks for the question. Heart rate variability is measured as the time difference in adjacent heart beat intervals as you breathe in and out, so the unit is milliseconds (ms). </p><p>Although HRV values are somewhat personal, HRV tends to decrease with age and increase with fitness, so in the scale I created for ithlete, 100 would likely be someone who is very athletic. I have seen numbers in the mid 90s from very fit athletes, but also numbers in the high 60s/70s from competitive sports people. On the other hand, someone who is out of shape or stressed might measure in the high 40s / low 50s. What matters in daily training is that day's value compared to your recent average (the fat blue line). That difference is where the traffic light colours come from.</p><br><br>Posted to: HRV value <a href="http://www.myithlete.com/getting-the-most-from-ithlete/show/26?start=0#post27">Show Thread</a> | <a href="http://www.myithlete.com/getting-the-most-from-ithlete/reply/26?start=0#post27">Post Reply</a> Tue, 16 Feb 2010 14:35:09 +0000 moderator http://www.myithlete.com/getting-the-most-from-ithlete/show/26?start=0#post27 http://www.myithlete.com/getting-the-most-from-ithlete/show/26#post26 <p>I know that the HRV value is scored out of 100 - but what does the actual number mean? <br />What would a reading of 100 mean? <br />What would a reading of 0 mean? </p><p>I suppose I'm asking is there a unit assigned to number.</p><br><br>Posted to: HRV value <a href="http://www.myithlete.com/getting-the-most-from-ithlete/show/26#post26">Show Thread</a> | <a href="http://www.myithlete.com/getting-the-most-from-ithlete/show/26#post26">Post Reply</a> Thu, 11 Feb 2010 15:49:23 +0000 tunney http://www.myithlete.com/getting-the-most-from-ithlete/show/26#post26