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The effect of body posture on exercise- and hyperventilation-induced asthma
1Department of Research and Sport Medicine, Wingate Institute Netania, Haifa, Israel.
Chest
|November 1, 1991
Summary
Body posture does not affect exercise-induced bronchoconstriction in asthmatic children. This suggests other factors may influence swimming-induced asthma, potentially related to water immersion.
Area of Science:
- Pediatric Pulmonology
- Exercise Physiology
- Asthma Research
Background:
- Swimming is considered low asthmogenicity, possibly due to horizontal body position.
- The impact of body posture on exercise-induced asthma (EIA) and hyperventilation-induced asthma (HIA) requires further investigation.
Purpose of the Study:
- To investigate the effect of upright versus prone body postures on pulmonary function in asthmatic children.
- To determine if body posture influences the severity of bronchoconstriction following exercise or hyperventilation.
Main Methods:
- Twelve asthmatic boys (12-16 years) underwent exercise and hyperventilation tests in upright and prone positions.
- Tests were conducted in a cold, dry climatic chamber (10°C, 31% RH) with controlled ventilation.
- Pulmonary function (FEV1) was measured before and after each condition.
Main Results:
- No significant differences in FEV1 decline were observed between prone and upright postures after exercise (EIA).
- Similarly, no differences in FEV1 decline were found between postures following hyperventilation (HIA).
- Bronchoconstriction severity was comparable across postures for both EIA and HIA.
Conclusions:
- Body posture on land does not meaningfully alter bronchoconstriction severity in asthmatic children.
- The potential interactive effect of body posture and water immersion on swimming-induced asthma (SIA) warrants further study.