Why the study?
How do sex, age, and heart rate influence noninvasive measurements of systolic time intervals in normal subjects?
Population
195 normal subjects, 98 males and 97 females, between the age of 5 and 79 years.
Design
Cross-sectional
Authors
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May guide age- and HR-adjusted interpretation of systolic time intervals; leaves open prospective validation before clinical adoption.
How do sex, age, and heart rate influence noninvasive measurements of systolic time intervals in normal subjects?
Systolic time intervals are significantly shorter in children and young subjects under 19 years and are inversely correlated with heart rate, providing reference equations for normal subjects.
BABA et al. (1977) studied this question.
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