1. Anteroposterior balance reactions in children with spastic cerebral palsy.
- Author
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Crenshaw, Jeremy R, Petersen, Drew A, Conner, Benjamin C, Tracy, James B, Pigman, Jamie, Wright, Henry G, Miller, Freeman, Johnson, Curtis L, and Modlesky, Christopher M
- Subjects
CHILDREN with cerebral palsy ,DYNAMIC stability ,CEREBRAL palsy ,AGE groups ,SOCIAL interaction ,AGE distribution ,COMPARATIVE studies ,POSTURAL balance ,RESEARCH methodology ,MEDICAL cooperation ,RESEARCH ,WALKING ,EVALUATION research ,CROSS-sectional method ,SKELETAL muscle - Abstract
Aim: To compare anterior and posterior standing balance reactions, as measured by single-stepping thresholds, in children with and without spastic cerebral palsy (CP).Method: Seventeen ambulatory children with spastic CP (eight males, nine females) and 28 typically developing children (13 males, 15 females; age range 5-12y, mean [SD] 9y 2mo [2y 3mo]), were included in this cross-sectional, observational study. Balance reaction skill was quantified as anterior and posterior single-stepping thresholds, or the treadmill-induced perturbations that consistently elicited a step in that direction. In order to understand the underlying mechanisms of between-group differences in stepping thresholds, dynamic stability was quantified using the minimum margin of stability. Ankle muscle activation latency, magnitude, and co-contraction were assessed with surface electromyography.Results: We observed an age and group interaction for anterior thresholds (p=0.001, partial η2 =0.24). At older (≈11y; p<0.001, partial η2 =0.48), but not younger (≈7y; p=0.33, partial η2 =0.02) ages, typically developing children had larger anterior thresholds than those with CP. In response to near-threshold anterior perturbations, older typically developing children recovered from more instability than their peers with CP (p=0.004, partial η2 =0.18). Older children had no between-group differences in ankle muscle activity. No between-group differences were observed in posterior thresholds.Interpretation: The effects of CP on balance reactions are age- and direction-specific. Older typically developing children are more able or willing to withhold a step when unstable.What This Paper Adds: Children with spastic cerebral palsy have age- and direction-specific balance-reaction impairments. Lower anterior stepping thresholds were observed in older, but not younger children. Older typically developing children withheld a forward step at higher levels of instability. No between-group differences were seen in posterior stepping thresholds. [ABSTRACT FROM AUTHOR]- Published
- 2020
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