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.
A:It is very easy to apply for Pell Grant application, you can do it online through our website too. The Environmental Protection Agency is a contributor in the Pell Grants. The organization was formed in 1970 with a mission to protect public health and keep the environment clean and pollution free.