Answer;
Explanation:
If it is possible to measure the time intervals between consecutive heart beat in milliseconds, and determine how the time intervals varies from time to time, then the value obtained is called Heart Rate Variability. It can be felt when pulse at the wrist is measured and deep breath taken and exhale afterwards.
Longer interval is observed during exhalation when the HR is long thus the heart slows down,while short intervals during fast beat of the heart,with fast HR.It can be detected by ECG through measurement of intervals between R waves( R-R).
HRV is regulated by ANS, through the sympathetic , which increases the heartbeat and therefore reduces the HRV, and the parasympathetic which reduces the heart beat and therefore increases the HRV, since the slower beats enabled easy measurements of intervals between consecutive heartbeats.
Therefore, the variance in the R-R waves intervals is determined by the parasympathetic nervous system which slow the heart beats for higher HRV values to be obtained.The answer is TRUE
