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Sexual differences in central arterial wave reflection are evident in prepubescent children
Lee Stoner1, James Faulkner, Nicole Westrupp
1aSchool of Sport and Exercise, Massey University, Wellington bStarship Children's Hospital, Auckland District Health Board, Auckland cInstitute of Food, Nutrition and Human Health, Massey University, Wellington, New Zealand.
Journal of Hypertension
|October 12, 2014
Summary
In healthy children before puberty, girls show greater central arterial wave reflection (AIx) than boys, regardless of body size or fitness. This finding highlights early sex-based cardiovascular differences.
Area of Science:
- Pediatric cardiology
- Cardiovascular physiology
- Developmental biology
Background:
- Central arterial wave reflection is a key indicator of cardiovascular health.
- Understanding sex-based differences in cardiovascular parameters during childhood is crucial for long-term health.
- Previous research has not fully elucidated arterial wave reflection differences between sexes in prepubescent children.
Purpose of the Study:
- To investigate the influence of sex on central arterial wave reflection in healthy prepubescent children.
- To determine if these differences persist when matched for body size and cardiorespiratory fitness.
- To identify potential early indicators of cardiovascular risk in children.
Main Methods:
- Recruited 55 healthy children (9.8 ± 1.0 years, 44% girls).
- Assessed cardiorespiratory fitness using a graded exercise test to volitional exhaustion.
- Measured augmentation index (AIx) and central blood pressures using pulse wave analysis.
Main Results:
- Girls and boys were well-matched for age, body size, and cardiorespiratory fitness.
- No significant differences were observed between sexes in heart rate or central blood pressure.
- Girls exhibited a significantly greater augmentation index (AIx) compared to boys (P=0.015).
Conclusions:
- Sexual dimorphism in central arterial wave reflection is evident before puberty.
- These differences are independent of stature and cardiorespiratory fitness.
- Further research is needed to understand the mechanisms and implications for left ventricular mass during childhood.
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