Boda, W L, Natelson, B H, Sisto, S A et al. · Journal of the neurological sciences · 1995 · DOI
Quick Summary
Researchers filmed how people with ME/CFS walked at different speeds and compared them to sedentary (non-exercising) healthy people. They found that people with ME/CFS walked differently—they moved their hips differently, bent their knees less, and took shorter steps relative to their leg length. People with ME/CFS also ran much more slowly than the comparison group.
Why It Matters
This study provides objective, measurable evidence that ME/CFS affects physical movement patterns, validating patient reports of movement difficulties and offering gait analysis as a potential outcome measure for clinical trials. Identifying specific gait abnormalities could help clinicians recognize ME/CFS and track disease progression or treatment response.
Observed Findings
CFS patients demonstrated significantly slower 30 m run times compared to controls (p < 0.001)
Hip angles during stance and swing phases were significantly larger in CFS patients at the fastest walking speed of 1.34 m/sec
Knee flexion during stance and swing was significantly reduced in CFS patients at the slowest speed (0.45 m/sec)
Stride length relative to leg length was significantly shorter in CFS patients at slower speeds (0.45 and 0.89 m/sec) but not at fastest speed
Inferred Conclusions
CFS patients exhibit measurable gait abnormalities compared to sedentary controls
Gait abnormalities may reflect balance impairment, muscle weakness, or central nervous system dysfunction
Gait kinematics could serve as an objective tool for measuring outcomes in therapeutic intervention trials
Remaining Questions
What is the specific mechanism causing these gait abnormalities—balance dysfunction, muscle weakness, neurological impairment, or combinations thereof?
How do CFS patients' gait patterns compare to healthy active controls rather than sedentary controls?
Do gait abnormalities change over time or in response to treatment interventions?
What This Study Does Not Prove
This study does not prove what causes the gait abnormalities—it cannot distinguish between muscle weakness, balance problems, neurological dysfunction, or deconditioning. The comparison group was sedentary controls rather than healthy active individuals, so differences may partially reflect the controls' reduced fitness rather than unique CFS pathology. Cross-sectional design prevents conclusions about whether gait changes worsen over time or recover with treatment.