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[Age-related transfer coefficients of the basic indices of cardiac variance]
Insights
This study establishes age-specific transfer coefficients for analysis of cardiac variance (ACV) indicators. These findings enable accurate age corrections for comparing cardiac variance across different age groups.
Area of Science:
- Cardiology
- Biomedical Engineering
- Physiology
Context:
- Cardiac variance analysis (ACV) provides insights into autonomic nervous system function.
- Age-related physiological changes can significantly impact cardiac variance indicators.
- Standardized methods are needed for comparing ACV data across diverse age demographics.
Purpose:
- To investigate the relationship between age and various indicators of cardiac variance (ACV).
- To develop mathematical expressions defining age-ACV indicator relationships.
- To derive transfer coefficients for age-correcting ACV measurements.
Summary:
- Investigated 518 subjects, analyzing ACV indicators including mean RR intervals, standard deviation, amplitude of the mode, homeostatic index, and spectral powers related to thermoregulation and respiration.
- Developed mathematical models to describe the relationship between age and each ACV indicator.
- Derived transfer coefficients from these models to facilitate age-specific adjustments of ACV data.
Impact:
- Enables precise age corrections for ACV measurements, enhancing comparability between individuals and groups.
- Provides a methodological foundation for establishing age-specific nomograms for ACV indicators.
- Improves the accuracy and reliability of cardiac variance analysis in diverse age populations.
Abstract:
This study was concerned with the relationship of changes in cardiac variance to age. A total of 518 subjects were involved. The following indicators of ACV (analysis of cardiac variance) were investigated: mean--mean value of successive cardiac intervals, SD--standard deviation of mean value of cardiac intervals (R-R), AMo--amplitude of the mode, HI--homeostatic index, Pt--spectral power of R-R related to thermoregulation, Pr--spectral power of R-R related to respiration, IBO--index of centralization. For each one of these ACV indicators, a mathematical expression of its relationship to age was specified. The coefficients obtained from the indicated expressions of the relationship "age-to-ACV indicators" represent transfer coefficients for the particular measured quantities. Their methodological importance lies in the fact that through them it becomes possible to make age corrections of ACV indicator figures for the purpose of comparing individual subjects or groups of subjects. These coefficients help to establish nomograms for the particular age ranges.