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Increase in tracheal size with age. Implications for maximal expiratory flow.
The American Review of Respiratory Disease
|October 1, 1985
Summary
As men age, their tracheal size increases, which may offset lung recoil loss. This airway change helps preserve peak expiratory flow (PEF) and FEV1, preventing increased airway resistance.
Area of Science:
- Pulmonary Physiology
- Aging Research
- Respiratory Mechanics
Background:
- Mechanical properties of central airways are crucial for maximal expiratory flow.
- Understanding age-related changes in airway dimensions and function is important for respiratory health.
Purpose of the Study:
- To investigate the relationship between aging, tracheal size, and maximal expiratory flow in asymptomatic men.
- To determine how tracheal cross-sectional area (X-SA) changes with age and its correlation with lung function parameters.
Main Methods:
- Cross-sectional study involving 50 lifelong non-smoking men aged 19-61 years.
- Estimation of intrathoracic tracheal X-SA from chest radiographs.
- Measurement of maximal expiratory flow-volume curves and spirometry (FEV1).
Main Results:
- Tracheal X-SA increased with age, from 2.81 cm² at age 21.1 to 3.22 cm² at age 52.5.
- Tracheal X-SA showed significant correlations with predicted peak expiratory flow (PEF) and FEV1.
- These correlations were weaker than previously reported in younger populations.
Conclusions:
- Increasing age is associated with larger tracheal size in men.
- Aging-induced changes in large airways, potentially including loss of elastic recoil, may compensate for lung elastic recoil decline.
- These airway adaptations contribute to the relatively preserved PEF and stable airway resistance observed with aging.