Why the study?
What is the repeatability and what are the sources of variability in electrocardiographic tests of cardiovascular autonomic function in normal subjects?
Population
10 normal subjects with no known autonomic dysfunction
Design
Cross-sectional
Follow-up
four weeks
Authors
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Significant between-subject variability and respiratory influences limit test repeatability in normals; leaves open need for standardized protocols before wider use.
What is the repeatability and what are the sources of variability in electrocardiographic tests of cardiovascular autonomic function in normal subjects?
Electrocardiographic tests of cardiovascular autonomic function have significant between-subject variability, and within-subject repeatability is strongly influenced by respiratory pattern variability.
Lawrence et al. (1992) studied this question.
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