title: Comparison of ground reaction forces during the Basic Step on the Core Board platform at various levels of stability.
abstract: OBJECTIVE
  The aim of this paper was to examine and compare the changes of ground reaction forces observed during the Basic Step on the Core Board fitness device at various levels of stability.
  
  
  METHODS
  The study involved 10 female students. Participants stepped on and off the Core Board 10 times at 3 levels of stability. After completing a series of steps, the Core Board's stability was modified and the participant repeated the whole series. The measurement platform to examine three components of the reaction force (horizontal in the sagittal and frontal planes, and vertical) was used.
  
  
  RESULTS
  The ground reaction force (GRF) observed on the Core Board, in the vertical and horizontal components is higher at all three levels of stability than on the platform without the device. Significant differences in GRF were observed in the horizontal component in the frontal plane (Fz) at all three levels of mobility as well as in impulse, measured on platforms with the device.
  
  
  CONCLUSIONS
  The results on the Core Board training device present highest horizontal ground reaction forces in frontal plane at the highest level of Core Board mobility and this showing little medio-lateral stability and a more reactive way of movement regulation of the participants. As a consequence of the force patterns found it may be suggested that fitness training concepts should focus more possibly higher strains on the locomotor system most likely caused by changed ground reaction force patterns, an idea that has to be further analyzed with more complex measurement approaches.
authors.affiliation: Department of Biomechanics, Józef Piłsudski University of Physical Education in Warsaw, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Karczewska
authors.affiliation: Department of Biomechanics, Józef Piłsudski University of Physical Education in Warsaw, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Madej
authors.affiliation: Department of Biomechanics, Józef Piłsudski University of Physical Education in Warsaw, Poland.
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Sadowska
authors.affiliation: Department of Biomechanics, Józef Piłsudski University of Physical Education in Warsaw, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Mastalerz
authors.affiliation: Department of Biomechanics, Józef Piłsudski University of Physical Education in Warsaw, Poland.
authors.forename: Czesław
authors.initials: C
authors.lastname: Urbanik
mesh_terms: D000328:Adult; D005081:Exercise Therapy / Q000295:instrumentation* / Q000379:methods; D005260:Female; D005528:Foot / Q000502:physiology*; D006801:Humans; D064797:Physical Conditioning, Human / Q000295:instrumentation* / Q000379:methods; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D016138:Walking / Q000502:physiology