Aging process on spectrally determined spontaneous baroreflex sensitivity: a 5-year prospective study

Area of Science:

• Physiology
• Cardiovascular Health
• Aging Research

Background:

• Cross-sectional studies suggest age-related decline in baroreflex sensitivity (BRS).
• Longitudinal evidence for intraindividual BRS decrease due to aging is lacking.
• BRS is crucial for blood pressure regulation and predicting cardiovascular events.

Purpose of the Study:

• To longitudinally assess the age-related decline in spectrally determined baroreflex sensitivity (S-BRS).
• To quantify the intraindividual rate of S-BRS decrease over a 5-year period in healthy men.
• To evaluate the reproducibility of S-BRS measurements in a longitudinal context.

Main Methods:

• Utilized data from a 5-year prospective study involving 205 healthy men (aged 18-50).
• Employed cross-spectral analysis on beat-to-beat blood pressure recordings (Finapress) to determine S-BRS.
• Performed statistical analysis to assess correlations between S-BRS and age, and to evaluate longitudinal changes.

Main Results:

• S-BRS showed a significant negative correlation with age at both baseline and follow-up.
• The intraindividual decrease in S-BRS over 5 years was estimated at 3.6% per year.
• S-BRS measurements demonstrated good reproducibility over the 5-year interval, with no significant differences in slopes or intercepts.

Conclusions:

• This is the first longitudinal study to estimate the rate of age-related physiological S-BRS decrease in healthy middle-aged men.
• Findings support the clinical relevance of assessing spontaneous BRS for predicting hypertension and cardiovascular events.
• The study underscores the importance of longitudinal monitoring of BRS in aging populations.