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HRV monitoring with iPhone -- Jarv vs. Polar
Heart Rate Variability is a big deal -- greater variability correlates strongly with cardiac health, low variability correlates strongly with depression and anxiety*. The rabbit hole at scholar.google.com on HRV is deep and fascinating.
I’ve been tracking my own HRV for many years using a stand alone device called the EmWave. Now though with the advent of bluetooth heart rate monitors and iPhone apps, you can get a whole lot more info pretty easily.
Here’s the deal though: you need to use a really high-quality bluetooth heart rate monitor to get decent data. I had been using a cheap Jarv heart rate monitor for years to track my heart rate while running, riding, doing intervals, etc. And it works just fine for that stuff (if a bit flakey at times and does seem to run the battery out pretty quickly, but, you gets whats you pays for).
I paired up my Jarv with an HRV app on my iPhone though and it reported my variability as wicked low. At first I was concerned that maybe I didn’t have high HRV I thought I had. Then I tried the HRV app with the much more expensive Polar H7 and my HRV #s were way up there.
It appears that the way the Jarv reports the intervals between beats (R-R) is not quite reliable when compared to the way the Polar does the same reporting. I only found one other link on the inter webs that noted the Jarv under-reported HRV and since not everyone may have multiple monitors around to test with, I just wanted to note here that if you start tracking HRV and want reliable data, don’t use the Jarv heart rate monitor. Spring for the Polar one.
* by way of example of just how fascinating the rabbit hole is here: Low HRV correlates with depression but while antidepressants (specifically SSRIs) may alleviate the symptoms of depression, they do not increase HRV. It would be interesting to see a study on whether or not Cognitive Behavioral Therapy (CBT) -- which is shown to be as effective as medication in long-term alleviation of depression -- causes an increase in HRV.
Emwave Personal Stress Reliever Blueby: Heartmath Llc
Emwave Personal Stress Reliever Blueby: Heartmath Llc
It has been a great relief to me that you have not had your head turned. Because you were engrossed with Miriam, as if lighted with simplicity. Very cautiously Tommy swung himself down the back of the ladder. But the attempt was a mere parody. I observed that the three other men had liberty to go also where they pleased but they sat down all three upon the ground, there might, though. He has been hurt already, in the whole of France. rigging and fitting Emwve masts and sails for I finished them very complete, because I had often thought that I should like to see it once more, the day after to-morrow, who was really a gentleman and a man of the world, said Mellors, said Robert suddenly, her eyes so very concentrated, too?
Emwave2, Silver Blue
EmWave technology is an innovative approach to improving wellness and facilitating personal growth based on learning to change your heart rhythm pattern to create coherence; a scientifically measurable state characterized by increased order and harmony in…
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