Physical Strain: A New Perspective on Walking in Cerebral Palsy

Area of Science:

• Pediatrics
• Neurology
• Rehabilitation Medicine

Background:

• Cerebral palsy (CP) often impacts motor function, affecting mobility and daily activities.
• Understanding the physiological demands of walking in children with CP is crucial for developing effective interventions.
• Previous research has highlighted challenges in gait and energy expenditure in this population.

Purpose of the Study:

• To quantify the physical strain associated with walking in children and adolescents with CP.
• To determine the proportion of individuals with CP walking above their anaerobic threshold.
• To identify distinct phenotypes of walking physical strain based on aerobic capacity and energy cost.

Main Methods:

• A cohort study involving participants with CP (Gross Motor Function Classification System levels I-III) and typically developing (TD) peers.
• Measurement of oxygen consumption during walking (Vo2walk), speed, and energy cost (EC).
• Assessment of peak oxygen consumption (Vo2peak) and anaerobic threshold via maximal cycling exercise test.

Main Results:

• Participants with CP exhibited significantly higher physical strain during walking compared to TD participants (55-78% vs. 40%).
• A substantial proportion of individuals with CP (43%) walked at or above their anaerobic threshold, versus 10% of TD participants.
• Reduced Vo2peak or increased EC independently increased physical strain by 18-20%, while a combination resulted in a 40% increase.

Conclusions:

• Children and adolescents with CP experience high physical strain during walking, comparable to intense exercise.
• Walking near or above the anaerobic threshold in this population likely contributes to fatigue and limits endurance.
• Interventions for high physical strain in CP should consider individual variations in aerobic capacity and energy cost for optimal effectiveness.