title: Agreement between temporal and spatial gait parameters from an instrumented walkway and treadmill system at matched walking speed.
abstract: BACKGROUND
  Commercially available instrumented treadmill systems that provide continuous measures of temporospatial gait parameters have recently become available for clinical gait analysis. This study evaluated the level of agreement between temporospatial gait parameters derived from a new instrumented treadmill, which incorporated a capacitance-based pressure array, with those measured by a conventional instrumented walkway (criterion standard).
  
  
  METHODS
  Temporospatial gait parameters were estimated from 39 healthy adults while walking over an instrumented walkway (GAITRite(®)) and instrumented treadmill system (Zebris) at matched speed. Differences in temporospatial parameters derived from the two systems were evaluated using repeated measures ANOVA models. Pearson-product-moment correlations were used to investigate relationships between variables measured by each system. Agreement was assessed by calculating the bias and 95% limits of agreement.
  
  
  RESULTS
  All temporospatial parameters measured via the instrumented walkway were significantly different from those obtained from the instrumented treadmill (P<.01). Temporospatial parameters derived from the two systems were highly correlated (r, 0.79-0.95). The 95% limits of agreement for temporal parameters were typically less than ±2% of gait cycle duration. However, 95% limits of agreement for spatial measures were as much as ±5cm.
  
  
  CONCLUSIONS
  Differences in temporospatial parameters between systems were small but statistically significant and of similar magnitude to changes reported between shod and unshod gait in healthy young adults. Temporospatial parameters derived from an instrumented treadmill, therefore, are not representative of those obtained from an instrumented walkway and should not be interpreted with reference to literature on overground walking.
authors: Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia; Centre of Excellence for Applied Sport Science Research, Queensland Academy of Sport, Queensland, Australia. swearing@bond.edu.au
authors: Scott C
authors: SC
authors: Wearing
authors: Lloyd F
authors: LF
authors: Reed
authors: Stephen R
authors: SR
authors: Urry
mesh_terms: D000293:Adolescent; D001696:Biomechanical Phenomena; D004867:Equipment Design; D005080:Exercise Test / Q000295:instrumentation*; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D011312:Pressure; D013997:Time Factors; D055815:Young Adult
keywords: Biomechanics; Gait; Locomotion; Rehabilitation