Accelerations and decelerations in heart rhythm differentiate vasovagal sensitive humans

The double exponential function which approximates the distributions of accelerations and decelerations in heart rate can be used in assessing vasovagal pathophysiology evoked by the head-up tilt test. We test how the coefficients of the exponential decay depend on the bin size used in the numerical construction of distributions. These coefficients turn out to be stable in a wide range of bin sizes, which justifies our proposition of indices of autonomic activation in assessing the dynamic interplay among physiological processes altered by tilting.