Reproducibility of resting heart rate variability with short sampling periods

Area of Science:

• Physiology
• Cardiovascular Health
• Biomedical Engineering

Background:

• Heart Rate Variability (HRV) is a non-invasive indicator of autonomic nervous system function.
• Accurate HRV measurement is crucial for assessing cardiovascular health and stress.
• Shortened measurement periods may enhance the practicality of HRV assessment.

Purpose of the Study:

• To evaluate the reproducibility of resting heart rate variability (HRV) measurements.
• To assess the efficacy of short sampling periods (2.5 and 5 minutes) for HRV analysis.
• To validate an office-based personal computer measurement system for HRV.

Main Methods:

• Eight healthy, active women underwent ECG recordings on two separate days within a week.
• Controlled environmental and physiological conditions were maintained.
• HRV was analyzed using 2.5- and 5-minute ECG samples, calculating time-domain (meanRR, SDNN) and frequency-domain (LF, HF, LF:HF) variables.

Main Results:

• No significant differences in HRV were found between the two measurement days (p >= 0.23).
• Time-domain variables (meanRR, SDNN) demonstrated good reproducibility (R = 0.86-0.90) for both sampling periods.
• Frequency-domain variables showed average reproducibility (R = 0.67-0.96), with the LF:HF ratio being most reproducible.

Conclusions:

• Short sampling periods (2.5 and 5 minutes) are reproducible for assessing resting heart rate variability in healthy women.
• PC-based HRV measurement systems offer reliable results for time-domain variables.
• Further investigation may be needed to optimize frequency-domain HRV analysis with short sampling times.