Is heart rate variability a good way to measure stress and are there at-home devices/software for doing it? (maybe chest strap-app combos)?

No. Heart rate variability is actually a sign of a healthy heart, not stress. Your heart rate should vary throughout the day, in response to a multitude of factors. Commercial heart rate monitors do measure HR accurately, and can be used to track your fitness level over time. Hope this helps!

Related Questions

What device monitors only anxiety and not excitement? Wristbands that monitor heart rate variability can't tell the difference

Spire. One device is called Spire. It clips onto your belt or bra. It measures your breathing and you can watch your breath wave on your iPhone. When you get anxious you tend to breath faster. It syncs with your iPhone. It also measures your activity level. It comes with meditation instruction. Available on Amazon. See://bit.ly/28W8bpB. Read more...

How could the level heart rate variability be an indicator of the level of sympathetic or vagal control?

It is. Our regular heart rate which is slower than the intrinsic rate is the balance between the sympathetic and vagal inputs to the sinus node at any time with the latter dominating.This causes beat to beat variation specially noticeable during respiration Parasympathetic activity is represented by reduced variation in time domain and dominance of hi frequency oscillations in the spectral analysis. Read more...

My heart rate variability at rest is extremely high (RMSSD >300), can that be a cause of concern?

YES. Please immediately go to a cardiologist or ER to have your rate checked on a monitor and you will need and EKG and echocardiogram as well as medication to control your rate. Read more...

I get high 180 heart rate at night but woke up this morning with a heart rate of 36. What can cause such variability?

Arrhythmia. A heart rate of 180, given your age, is approaching the maximum heart rate that doctor's expect when doing "usual" activities (in this case, exercise) without an underlying disorder. If u get this heart rate while sleeping or resting, then u could have atrial fibrilllation (A-fib) or another arrhythmia. In the morning, ur heart compensates by slowing down to rest (the only way). See a cardiologist. Read more...