title: Oscillation of plantar pressure center in athletes and non-athletes with and without ankle sprains.
abstract: OBJECTIVE
  To assess whether there is any difference in the oscillation of the plantar pressure center in single-leg stance between athletes and non-athletes with and without ankle sprains.
  
  
  METHODS
  54 volunteers performed four static assessments and one dynamic assessment while standing on one foot on a baropodometer, barefoot, for 10 s in each test. The variables of area (cm(2)), distance (cm), anteroposterior oscillation (cm), mediolateral oscillation (cm) and mean velocity (cm/s) were analyzed. The items "other symptoms" and "sports and recreation" of the subjective Foot and Ankle Outcome Score (FAOS) questionnaire were applied. For the statistical analysis, repeated-measurement ANOVA (ANOVA-MR), multivariate ANOVA (MANOVA), Tukey's post hoc test and partial eta squared were used.
  
  
  RESULTS
  ANOVA-MR revealed differences regarding distance, with major effects for eyes (p < 0.001), knees (p < 0.001), group (p < 0.05) and the interaction between eyes and knees (p < 0.05); and regarding mean velocity with major effects for eyes (p < 0.001), knees (p < 0.001) (p < 0.05), group (p < 0.05) and the interaction between eyes and knees (p < 0.05). MANOVA revealed main group effects for distance (p < 0.05), anteroposterior oscillation (p < 0.05) and mean velocity (p < 0.05). In the FAOS questionnaire, there were no differences: "other symptoms", p > 0.05; and "sport and recreation", p > 0.05.
  
  
  CONCLUSIONS
  Athletes present higher mean velocity of oscillation of plantar pressure center and generally do not have differences in oscillation amplitude in the sagittal and coronal planes, in comparison with non-athletes.
authors: Universidade Federal de São Paulo, Santos, SP, Brazil.
authors: André Kenzo
authors: AK
authors: Saito
authors: Universidade Federal de São Paulo, Departamento de Oftalmologia, São Paulo, SP, Brazil.
authors: Martina
authors: M
authors: Navarro
authors: Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil.
authors: Marcelo Faria
authors: MF
authors: Silva
authors: Irmandade da Santa Casa da Misericórdia de Santos, Serviço de Ortopedia, Santos, SP, Brazil.
authors: Eduardo Kenzo
authors: EK
authors: Arie
authors: Universidade Federal de São Paulo, Departamento de Ciências do Movimento Humano, São Paulo, SP, Brazil.
authors: Maria Stella
authors: MS
authors: Peccin
keywords: Ankle injuries; Foot; Postural balance; Pressure