respiratory sinus arrhythmia

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respiratory sinus arrhythmia (resˑ·p·tōˈ·rē sīˑ·ns ·rithˑ·mē·),

n the cyclical change in heart rate that occurs in correspondence with breathing rhythm; can be used as an indicator of health. The dampening or absence of RSA may indicate stress or heart damage.
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Hayano J, Yasuma F, Okada A, Mukai S, Fujinami T (1996) Respiratory sinus arrhythmia.
Taha BH, Simon PM, Dempsey JA, Skatrud JB, Iber C (1995) Respiratory sinus arrhythmia in humans: an obligatory role for vagal feedback from the lungs.
1985 Changes in heart period, heart period variability and a spectral analysis estimate of respiratory sinus arrhythmia in response to pharmacological manipulations of the baroreceptor reflex in cats.
Baseline respiratory sinus arrhythmia and heart-rate responses during auditory stimulation of children with attention-deficit hyperactivity disorder.
Thus, we can confidently conclude that one of the important predicting subject criteria of operator "success" is the presence respiratory sinus arrhythmia (but not repetitive performance of the test) in a state of wakeful relaxation and closed eyes.
The researchers were interested in seeing if there were physical differences in the way high-power people and low-power people responded to others' suffering; specifically they wanted to test if high-powered individuals would exhibit greater autonomic emotion regulation [or respiratory sinus arrhythmia (RSA) reactivity].