Respiratory load perception in overweight and asthmatic children

Area of Science:

• Pediatric Pulmonology
• Respiratory Physiology
• Obesity Research

Background:

• Overweight asthmatic children report increased symptoms compared to normal weight asthmatics.
• This discrepancy is often attributed to a heightened perception of respiratory effort.
• Objective measures of respiratory load and perception are needed to clarify this relationship.

Purpose of the Study:

• To investigate the relationship between body mass index (BMI), asthma status, and perceived respiratory effort in children.
• To compare objective measures of respiratory load with subjective perception scores.
• To explore the impact of obesity on respiratory mechanics in asthmatic children.

Main Methods:

• Three groups of children (healthy weight controls, healthy weight asthmatics, overweight asthmatics) underwent an inspiratory resistive loading protocol.
• Perceived respiratory effort was rated throughout the protocol.
• Parasternal intercostal electromyogram (EMG) measured respiratory load, used to calculate the neuroventilatory activity ratio (NVEAR).

Main Results:

• Both perceived respiratory effort and NVEAR changed significantly with increasing resistive load.
• Higher BMI was associated with increased overall perception scores.
• Neither asthma status nor BMI-for-age percentile influenced the relationship between resistance and perception.

Conclusions:

• Overweight asthmatic children exhibit elevated overall respiratory effort.
• Responses to dynamic changes in respiratory load were comparable across groups.
• Altered respiratory mechanics linked to increased body mass may explain the greater disease burden in overweight asthmatic children.