A secondary goal is to determine if heart rate variability can identify those who will benefit most from the devices.

The effects of emotions on short-term power spectrum analysis of heart rate variability.

Mayer waves are correlated with heart rate variability.

Polar's products also measure heart rate variability.

The first to quantify and use heart rate variability both as response and individual difference variable in psychophysiological research.

This natural variation is known as heart rate variability (HRV).

But it did not answer some practical questions, like how do you measure heart rate variability, and how important is it in predicting risk?

The most commonly used non-linear method of analysing heart rate variability is the Poincaré plot.

Reduced heart rate variability and baroreflex sensitivity in primary biliary cirrhosis.

The statistical variability of that interbeat interval is what we call heart rate variability.

See also Heart rate variability.

The device attaches to three fingers, and measures heart rate variability and skin conductance level.

And vibrations, they say, can lower heart rate variability, relax brain wave patterns and reduce respiratory rates.

The technique called resonant breathing biofeedback teaches how to recognize and control involuntary heart rate variability.

Circulatory system: risk of heart disease, reduced heart rate variability, higher heart rate.

Marine n-3 fatty acids, wine intake, and heart rate variability in patients referred for coronary angiography.

Alpha-linolenic acid and heart rate variability.

Relationship of basal heart rate variability to in vivo cytokine responses after endotoxin exposure.

Stimulated production of proinflammatory cytokines covaries inversely with heart rate variability.

Reduced activity in newborns could contribute to reduced heart rate and heart rate variability.

Although chaotic behavior has been assumed, more rigorous testing has shown that heart rate variability cannot be described as a chaotic process.

As a differential hypothesis, resting heart rate variability measures were unrelated to orgasmic frequency from non-coital sexual activities.

Heart rate variability measures the amount of variability between heart beats, which has been reported to be associated with various pathologic conditions.

Heart rate variability has been linked to a wide array of variables, including: behavioral inhibition, sympathy, instrumental coping, attention, and temperament.

More advanced models will offer measurements of heart rate variability, activity, and breathing rate to assess parameters relating to a subject's fitness.