Effects of posture on lung function in obese children

Area of Science:

• Pediatric pulmonology
• Respiratory physiology
• Obesity research

Background:

• Forced expiratory manoeuvres are typically performed sitting, but standing may improve lung function in obesity by reducing diaphragmatic restriction.
• Data on posture's effect on lung function tests in obese children is limited.

Purpose of the Study:

• To compare lung function measurements in overweight and obese children when performed in standing versus sitting postures.
• To determine if standing posture increases lung function compared to sitting posture in this population.

Main Methods:

• 115 overweight and obese children (ages 7-17) underwent forced expiratory flow-volume manoeuvres.
• Measurements were taken in both sitting and standing postures in a randomized order.

Main Results:

• Forced expiratory volume in 1 second (FEV(1)), forced vital capacity (FVC), and forced expiratory flow at 50% of FVC (FEF(50)) were significantly higher in the sitting posture.
• Improvements in FEV(1), FVC, and FEF(50) were of minimal clinical significance.
• No significant differences were observed for FEV(1)/FVC ratio or peak expiratory flow between postures.

Conclusions:

• Sitting posture is appropriate for performing forced expiratory flow-volume manoeuvres in obese children.
• While statistically significant, the observed increases in FEV(1), FVC, and FEF(50) in the sitting posture have limited clinical impact.