title: A new method of determination of phases and symmetry in stand-to-sit-to-stand movement.
abstract: OBJECTIVE
  Determination of the phases in a stand-to-sit-to-stand task based on a derivative of the parameter with the lowest variance calculated based on the modified symmetry index.
  
  
  METHODS
  The study group comprised 11 healthy women and 11 healthy men from the University of Physical Education in Warsaw. The examination of the kinematic and kinetic parameters of sitting down and standing up from a chair was carried out using the Vicon Mx system and Kistler force platforms.
  
  
  RESULTS
  The modified symmetry index was employed to select the parameters used to choose those with the lowest variance. Consequently, the phases in a stand-to-sit-to-stand task were determined.
  
  
  CONCLUSIONS
  It was demonstrated that the task of sitting down is a reverse task with respect to standing up in terms of the symmetry of the parameters analyzed.
authors: Department of Physiotherapy, Józef Piłsudski University of Physical Education in Warsaw, Warszawa, Poland, michalinablazkiewicz@gmail.com.
authors: Michalina
authors: M
authors: Błażkiewicz
authors: Ida
authors: I
authors: Wiszomirska
authors: Andrzej
authors: A
authors: Wit
mesh_terms: D001696:Biomechanical Phenomena; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D055815:Young Adult