title: Relationship between ankle frontal muscle powers and three-d gait patterns.
abstract: OBJECTIVE
  This study was undertaken to demonstrate that the ankle frontal muscle power absorption and generation at push-off are related to the foot's initial position at heel-strike with respect to the body center of mass.
  
  
  METHODS
  Nineteen able-bodied male subjects participated in this study and were divided into two groups according to ankle frontal plane power generation or absorption at push-off.
  
  
  RESULTS
  At heel-strike, the group that absorbed had a center of pressure that was located on average 25% more anteriorly and 36% more laterally to the body center of mass. Moreover, at push-off, the center of pressure was closer (26%) to the center of mass than in the generating group. The absorbing group compensated by increasing their sagittal plane hip energy by 30% to pull the lower limb forward and their knee power absorption by 47% to slow down the leg before the subsequent heel-strike.
  
  
  CONCLUSIONS
  The foot's initial position at heel-strike explains in part the ankle frontal power generation or absorption at push-off. Increasing hip and knee sagittal joint powers and mechanical energies were the main contributors in compensating and providing a broader base of support and frontal plane ankle power absorption.
authors.affiliation: Research Center, Sainte-Justine Hospital, Montreal, Quebec, Canada.
authors.forename: Heydar
authors.initials: H
authors.lastname: Sadeghi
authors.forename: Paul
authors.initials: P
authors.lastname: Allard
authors.forename: Regis
authors.initials: R
authors.lastname: Lachance
authors.forename: Rachid
authors.initials: R
authors.lastname: Aissaoui
authors.forename: Somayeh
authors.initials: S
authors.lastname: Sadeghi
authors.forename: R
authors.initials: R
authors.lastname: Perrault
authors.forename: Morris
authors.initials: M
authors.lastname: Duhaime
mesh_terms: D000328:Adult; D000842:Ankle; D000886:Anthropometry; D001696:Biomechanical Phenomena; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*