Heart rate measurement and outcome

Area of Science:

• Cardiology
• Preventive Medicine
• Biostatistics

Background:

• Previous research on heart rate and heart rate variability's predictive value for cardiovascular disease risk is inconclusive.
• Variability in heart rate due to stress may impact measurement accuracy and study reproducibility.
• The Ohasama study initiated in 1985 in Japan aims to clarify these associations.

Purpose of the Study:

• To investigate the predictive value of home-measured and ambulatory heart rate and heart rate variability for cardiovascular mortality.
• To assess the impact of measurement accuracy and reproducibility on study outcomes.
• To determine the role of heart rate and its variability in hypertension evaluation.

Main Methods:

• Utilized data from the Ohasama study, including home measurements and ambulatory monitoring of heart rate and blood pressure.
• Analyzed heart rate averaged over 21 days from home measurements.
• Calculated heart rate variability as the standard deviation of daytime ambulatory heart rate measured every 30 minutes.

Main Results:

• A linear association was found between home-measured heart rate (averaged over 21 days) and cardiovascular mortality.
• Heart rate variability demonstrated an inverse correlation with cardiovascular mortality.
• These findings suggest distinct predictive roles for heart rate and heart rate variability.

Conclusions:

• Heart rate and heart rate variability are significant, often overlooked, predictors of cardiovascular mortality.
• Accurate and reproducible heart rate measurements are essential for reliable cardiovascular risk assessment.
• Both heart rate and heart rate variability should be considered in the comprehensive evaluation of hypertension.