Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats.It is measured by the variation in the beat-to-beat interval.Other terms used include: cycle length variability, RR variability (where R is a point corresponding to the peak of the QRS complex of the ECG wave; and RR is the interval between successive Rs), and heart period variability.ariation in the beat-to-beat interval is a physiological phenomenon. The SA node receives several different inputs and the instantaneous heart rate or RR interval and its variation are the results of these inputs. The main inputs are the sympathetic and the parasympathetic nervous system (PSNS) and humoral factors.
A:Pell grant is a federal grant that is given on need basis to the financially deserving students. Pell grant application process is a simple one that begins with Free Application for Federal Student Aid (FAFSA) form that has to be filled. The form is available online.
The Pell Grant is a need-based federal grant for low-income students who require financial support to pay for college. Pell Grants are awarded to undergraduate students who have not received their first bachelorâs degree and to some students who are enrolled in qualifying post-baccalaureate programs.