heart rate variability

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heart rate variability

Abbreviation: HRV
Spontaneous fluctuations above and below the mean heart rate. A reduced HRV is associated with an increased incidence of total mortality and cardiac events in post-myocardial infarction patients, as well as in apparently healthy individuals, esp. older persons.
See also: variability
References in periodicals archive ?
This study assesses frequency-domain analysis of HRV during rest and stress in adolescents with a parental history of DM.
For most people, infection with HRVs leads to minor illness that does not require medical attention, but the viruses can cause serious complications in people with severe asthma, chronic obstructive pulmonary disease, and other health problems.
Across the tuning dataset, high correlations were observed between modelled and measured HRV data.
ECG was recorded for 10 minutes, but to ensure being stationary, the final 5 minutes were used to analyze HRV. Time domain HRV measures were obtained by mean RR intervals (meanNN) and the root mean square of successive differences (RMSSD) whereas frequency domain measures of HRV were derived by Fast Fourier Transformation: they were low-frequency (LF; 0.04 - 0.15 Hz) and high-frequency (HF; 0.15 - 0.4 Hz) spectral power.
HRV has considerable potential to assess fluctuations in cardiac autonomic nervous activity in patients with various cardiovascular and non-cardiovascular disorders that include T2D (19,25,28).
HRV measurements may help determine the timing of intensive training sessions based on the autonomic regulation status, even in the presence of declined, vaguely mediated beat-to-beat HRV (31-33).
In contrast to frequency domain parameters, time domain HRV parameters are easily calculated and do not require complex computations.
Another study presented data of samples used in previous studies and tested whether HRV moderates the effects of cancer stage on tumor markers [45].
Our aim was to develop a PRV measurement technique, which is widely available and can replace the ECG-based HRV measurements.
The methods used for HRV analysis adhere to the standards developed by the Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology [15].
HRV data may be useful in such a situation as it can reflect improvement or worsening of illness, but there is no literature addressing this particular population.
The NIM index considers in one number two systems: vagal nerve activity (the autonomic nervous system in the numerator: HRV) and an inflammatory marker (the immune system response in the denominator: CRP).