title: Older adults prioritize postural stability in the anterior-posterior direction to regain balance following volitional lateral step.
abstract: BACKGROUND
  Postural control in the medial-lateral (ML) direction is of particular interest regarding the assessment of changes in postural control, as it is highly related to the risk of falling.
  
  
  OBJECTIVE
  To determine the postural strategies used to regain balance following a voluntary lateral step and compare these strategies between young and older adults.
  
  
  METHODS
  Sixteen older adults (60-90 years) and 14 young adults (20-40 years) were asked to stand quietly for 30s, walk in place and then take a lateral step and stand quietly (30s). Balance Post was divided into 10s intervals. Center of pressure displacement (CoP) and velocity (VCoP) in the anterio-posterior (AP) and ML directions were analyzed.
  
  
  RESULTS
  In both groups, CoP and VCoP in AP and ML increased in Post1 compared to Pre (P<0.001). Dissimilar to young adults, VCoP-Post2, Post3 ML were larger than Pre (P=0.01) in older adults. Age correlated with all VCoP (Pre and Post) in both ML (P<0.05) and AP directions (P<0.01).
  
  
  CONCLUSIONS
  Dissimilar to young adults, older adults use different postural strategies in ML and AP directions and prioritized postural stability in the AP direction to recover balance after completing a lateral step. In the ML direction, older adults took up to 30s to regain balance. Considering that age was related to larger CoP displacement and velocity, the AP strategy to recover postural balance following a lateral step could become less efficient as older adults age and therefore increasing the risk of falls.
authors: School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, ON, Canada.
authors: Shaun
authors: S
authors: Porter
authors: School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, ON, Canada. Electronic address: jnantel@uottawa.ca.
authors: Julie
authors: J
authors: Nantel
mesh_terms: D000058:Accidental Falls / Q000517:prevention & control*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D004856:Postural Balance / Q000502:physiology*; D011312:Pressure; D014796:Visual Perception; D055815:Young Adult
keywords: Aging; Falls; Lateral step; Postural balance; Postural strategies