Professional
Technical
IVT
heart rate variability
The variation in time intervals between consecutive heartbeats, used as a marker of autonomic nervous system function.
Full Definition
Heart rate variability (HRV) measures the fluctuation in time between successive heartbeats, reflecting the balance between sympathetic and parasympathetic nervous system activity. In cardiac rehabilitation, reduced HRV is associated with increased cardiovascular risk and poor prognosis following myocardial infarction. HRV can be assessed through various time-domain and frequency-domain measures, and may improve with exercise training and cardiac rehabilitation participation.
Usage
Usage note: May be abbreviated as HRV after first use; ensure context distinguishes from heart rate reserve.
In Context
- "The patient's heart rate variability improved significantly following completion of the cardiac rehabilitation program." — Outcomes assessment report
- "Reduced heart rate variability was noted on the initial assessment, indicating autonomic dysfunction." — Pre-program evaluation
Also known as
HRV
Contrasted with
fixed heart rate
Don't confuse with
heart rate reserve
resting heart rate