title: Step-to-step reproducibility and asymmetry to study gait auto-optimization in healthy and cerebral palsied subjects.
abstract: OBJECTIVE
  The purpose of our study was to compare plantar pressure asymmetry and step-to-step reproducibility in both able-bodied persons and two groups of hemiplegics. The relevance of the research was to determine the efficiency of asymmetry and reproducibility as indexes for diagnosis and rehabilitation processes.
  
  
  METHODS
  This study comprised 31 healthy young subjects and 20 young subjects suffering from cerebral palsy hemiplegia assigned to two groups of 10 subjects according to the severity of their musculoskeletal disorders. The peaks of plantar pressure and the time to peak pressure were recorded with an in-shoe measurement system. The intra-individual coefficient of variability was calculated to indicate the consistency of plantar pressure during walking and to define gait stability. The effect size was computed to quantify the asymmetry and measurements were conducted at eight footprint locations.
  
  
  RESULTS
  Results indicated few differences in step-to-step reproducibility between the healthy group and the less spastic group while the most affected group showed a more asymmetrical and unstable gait.
  
  
  CONCLUSIONS
  From the concept of self-optimisation and depending on the neuromotor disorders the organism could make priorities based on pain, mobility, stability or energy expenditure to develop the best gait auto-optimisation.
authors.affiliation: Laboratoire d'études de la motricité humaine, faculté des sciences du sport et de l'éducation physique, université de Lille-2, 9, rue de l'Université, 59790 Ronchin, France.
authors.forename: A
authors.initials: A
authors.lastname: Descatoire
authors.forename: V
authors.initials: V
authors.lastname: Femery
authors.forename: F
authors.initials: F
authors.lastname: Potdevin
authors.forename: P
authors.initials: P
authors.lastname: Moretto
mesh_terms: D001696:Biomechanical Phenomena / Q000502:physiology; D016022:Case-Control Studies; D002547:Cerebral Palsy / Q000150:complications / Q000503:physiopathology*; D002648:Child; D007839:Functional Laterality; D005684:Gait / Q000502:physiology*; D006429:Hemiplegia / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D015203:Reproducibility of Results