Six-minute walk test and factors affecting exercise capacity in children with cystic fibrosis

Area of Science:

• Pediatric Pulmonology
• Exercise Physiology

Background:

• Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs, particularly the lungs.
• Reduced physical capacity is a common manifestation in pediatric CF patients.
• The six-minute walk test (6MWT) is a standard measure of functional exercise capacity.

Purpose of the Study:

• To compare the results of the 6MWT in pediatric patients with CF versus healthy children.
• To identify factors influencing physical capacity in young CF patients during the 6MWT.

Main Methods:

• A cross-sectional study involving 50 children and adolescents with CF and 20 healthy controls.
• Participants completed the 6MWT, with vital signs and six-minute walk distance (6MWD) recorded before and after.
• Analysis included changes in heart rate, SpO2%, blood pressure, respiratory rate, and dyspnea severity.

Main Results:

• Patients with CF demonstrated significantly greater changes in heart rate, SpO2%, blood pressure, respiratory rate, and dyspnea severity post-6MWT.
• In CF patients, 6MWD correlated positively with regular chest physical therapy (CPT) and forced expiratory volume (FEV) > 80%.
• Improved physical capacity during 6MWT (less SpO2 decline, lower dyspnea) was observed in CF patients receiving regular CPT or mechanical vibration and with FEV > 80%.

Conclusions:

• Pediatric CF patients possess lower physical capacity compared to their healthy peers.
• Chest physical therapy (CPT) and mechanical vibration are potential interventions to enhance physical capacity in this population.