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Updated: Feb 14, 2026

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy
Published on: January 12, 2019
How do physical capacity, fatigue and performance differ in children with duchenne muscular dystrophy compared with
Akmer Mutlu1, Halil Alkan, Tuzun Fırat
1Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
Insights
Children with Duchenne Muscular Dystrophy (DMD) experience greater fatigue and energy expenditure than healthy peers. These differences are more pronounced in individuals with lower functional mobility.
Area of Science:
- Pediatric Neuromuscular Diseases
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Duchenne Muscular Dystrophy (DMD) significantly impacts children's functional abilities and daily activities.
- Understanding energy expenditure and fatigue is crucial for managing DMD progression and quality of life.
Purpose of the Study:
- To compare fatigue levels and energy expenditure in children with Duchenne Muscular Dystrophy (DMD) across different functional levels.
- To compare these metrics against those of healthy children.
Main Methods:
- A cross-sectional study involving 52 children with DMD (Brooke Functional Classification Scale Levels I-III) and 17 healthy children.
- Utilized the Six Minute Walk Test (6MWT), Northstar Ambulatory Assessment Scale (NSAA), Physiological Cost Index (PCI), and timed performance tests.
Main Results:
- Significant differences in Physiological Cost Index (PCI) were observed between DMD functional Levels 2 and 3, and Levels 1 and 3 (p<0.0083).
- Fatigue after activity, assessed by stair climbing post-6MWT, showed significant differences.
Conclusions:
- Children with DMD exhibited higher walking distances, fatigue levels, and energy expenditure compared to healthy children.
- These differences were more pronounced as the functional level of DMD patients decreased.
Objective:
To compare the fatigue levels and energy expenditure of children with Duchenne Muscular Dystrophy (DMD) at different functional levels with healthy children.
Methods:
The cross-sectional study was carried out in the Unit of Pediatric Neuromuscular Diseases in the Department of Physiotherapy and Rehabilitation, Faculty of Health Science, Hacettepe University between March 2015 and January 2016. Fifty two children diagnosed with DMD in Level I-III according to the Brooke Functional Classification Scale and 17 healthy children were included in the study. The Six Minute Walk Test (6MWT), Northstar Ambulatory Assessment Scale (NSAA), Physiological Cost Index (PCI), and Timed performance tests were used to assess the children.
Results:
Comparison in terms of PCI indicated a difference between Levels 2 and 3, and Levels 1 and 3 (p<0.0083). A difference was found in ascending and descending 4 stairs after 6MWT when fatigue after activity was evaluated.
Conclusion:
The walking distances, fatigue levels and energy expenditure of DMD patients were higher than the healthy peers. This difference was more prominent with decreasing functional level.
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