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Hypercapnic and hypoxic ventilatory responses during growth.

Y Honda, Y Ohyabu, M Sato

The Japanese Journal of Physiology

|January 1, 1986

Summary

Pediatric hypercapnic ventilatory chemosensitivity decreases with age, correlating with reduced CO2 output. Hypoxic chemosensitivity remained stable across age groups in children aged 7-18.

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Area of Science:

Pediatric respiratory physiology
Cardiorespiratory control during development

Background:

Ventilatory chemosensitivity is crucial for maintaining blood gas homeostasis.
Understanding developmental changes in chemosensitivity is vital for pediatric respiratory health.

Purpose of the Study:

To investigate age-related changes in hypercapnic and hypoxic ventilatory chemosensitivities in children.
To correlate ventilatory responses with metabolic parameters during growth.

Main Methods:

Cross-sectional study of 71 children aged 7-18 years, divided into 6 age groups.
Hypercapnic response assessed via rebreathing 5% CO2 in O2.
Hypoxic response measured using isocapnic progressive hypoxia test with controlled end-tidal PCO2.

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Main Results:

Normalized hypercapnic ventilatory response (CO2/BSA) progressively decreased with age.
This decline paralleled normalized CO2 output (VCO2/BSA) but not O2 intake (VO2/BSA).
Hypoxic ventilatory chemosensitivities showed no significant age-related differences.

Conclusions:

Normalized hypercapnic chemosensitivity declines during childhood and adolescence.
This decrease is associated with reduced CO2 output relative to body mass.
Hypoxic chemosensitivity appears to be age-independent in this pediatric cohort.