Assessment & Research

Children with cerebral palsy have greater stochastic features present in the variability of their gait kinematics.

Davies et al. (2013) · Research in developmental disabilities 2013
★ The Verdict

Most gait variability in spastic diplegic CP is random noise, not a fixable pattern—target strength and orthotics before timing drills.

✓ Read this if BCBAs who write gross-motor goals for school-age kids with spastic CP.
✗ Skip if Clinicians focused only on behavioral or language targets with no gait component.

01Research in Context

01

What this study did

Researchers filmed the kids with spastic diplegic cerebral palsy and 12 typically-developing peers walking. They used a new math tool called Langevin analysis to split each child's stride-to-stride changes into two buckets: predictable patterns (deterministic) and random noise (stochastic).

The goal was to see if the extra gait wobble in CP comes from hidden patterns the brain could fix, or from plain neuromuscular noise that is harder to train away.

02

What they found

Kids with CP had almost three times more stride-to-stride variability than their TD peers. Almost all of that extra scatter was random noise, not a hidden pattern.

In plain words: the limp is less about 'wrong rhythm' and more about 'static on the line' between brain and muscles.

03

How this fits with other research

Antunes et al. (2016) saw immediate gait gains after one hippotherapy session. Their short-term improvement shows some features can be tweaked, but Matson et al. (2013) warn the underlying noise remains—so hippotherapy benefits may fade quickly.

Sacco et al. (2010) used fancy stats to split autism behaviors into four clean parts. Matson et al. (2013) pull the same trick on gait, giving CP therapists a clearer picture of what is trainable versus what is background noise.

Dagnan et al. (2005) built switch-access tools for clients with minimal movement. Both papers push the field toward assessments that work even when the body gives noisy data.

04

Why it matters

When you see a child with CP walk unevenly, blame neuromuscular noise, not poor timing. This reframes goals: reduce noise with strength or orthotics first, then add rhythm drills. It also justifies using objective noise metrics to show small but real progress that step-count alone can miss.

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→ Action — try this Monday

Add a simple stride-to-stride time count in the hallway; if variability is high, refer to PT for strength or orthotic review before adding cueing strategies.

02At a glance

Intervention
not applicable
Design
other
Sample size
19
Population
developmental delay, neurotypical
Finding
not reported

03Original abstract

Children with CP have a more variable gait pattern. However, it is currently unknown if these variations arise from deterministic variations that are a result of a change in the motor command or stochastic features that are present in the nervous system. The aim of this investigation was to use a Langevin equation methodology to evaluate the deterministic and stochastic features that are present in the variability of the gait kinematics of children with cerebral palsy (CP). Ten children with spastic diplegic CP and nine typically developing (TD) children participated in this investigation. All of the children walked on a treadmill for 2 min while a three-dimensional motion capture system recorded the step kinematics. Our major findings for this investigation were: (1) children with CP had greater variability in their gait patterns than TD children, (2) the variability of the children with CP and TD children had similar deterministic features, (3) the variability had greater stochastic features for the children with CP, and (4) the increase in the amount of variability was strongly correlated with the increase in stochastic features. These results indicate that the variability seen in the gait patterns of children with CP may be due to the inability to suppress the noise that is present in the neuromuscular system.

Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.08.012