Reliability of center of pressure measures of gait initiation time in healthy older adults: Effect of obstacle negotiation and cognitive load on reaction and anticipatory postural adjustment phases

Maryam Hayati, Saeed Talebian, Hassan Ashayeri, Behrouz Attarbashi Moghadam, Mohammad-Reza Hadian, Gholam-Reza Olyaei, Najmeh Hoseini
2018 Physical Medicine and Rehabilitation Research  
Objective: Many studies have extensively explored gait initiation (GI) among older population; however, there seems to be a need for further investigating the reliability of this method, particularly during obstacle crossing or dual tasking. Aim: In this study we evaluated the reliability of the two-timing phases of GI, reaction phase (RP) and the anticipatory postural adjustment phase (APAP), regarding obstacle negotiation. Method: 11 healthy older adults participated in this study (mean ±SD
more » ... s study (mean ±SD age: 66.27± 3.58 year). The tests were performed in 4 conditions: a smooth walkway; a smooth walkway with concurrent cognitive task; an obstructed walkway; and an obstructed walkway with a concurrent cognitive task. In all 4 conditions the assessment was performed by the same rater in 2 sessions which were 15 minutes apart. Time in RP and APAP of GI were calculated from the center of pressure (COP) trajectory. Furthermore, intra class correlation coefficients (ICC) and standard errors of measurement (SEM) were calculated for all conditions. Results: The RP showed excellent reliability in all conditions; single task condition on both smooth (ICC=0.81, SEM=0.04) and obstructed walkways (ICC=0.84, SEM=0.03), dual task condition on smooth (ICC=0.76, SEM=0.04) and obstructed (ICC=0.86, SEM=0.04) walkways. The APAP showed good to excellent reliability in related conditions; single task condition on the smooth (ICC=0.79, SEM=0.04) walkway and obstructed walkway (ICC=0.65, SEM=0.04) and when dual tasking on the smooth and obstructed walkways [(ICC=0.73, SEM=0.04) and (ICC=0.81, SEM=0.03), respectively. Conclusions: We found good to excellent reliability for reaction and anticipatory postural adjustment phases. However, no clear pattern was found regarding to the effect of obstacle negotiation, or dual-tasking. This reliable method can be used as a tool of assessment in fall preventive rehabilitation programs, before and after training. Hayati M (2018) Reliability of center of pressure measures of gait initiation time in healthy older adults: Effect of obstacle negotiation and cognitive load on reaction and anticipatory postural adjustment phases Volume 3(5): 2-5 Hayati M (2018) Reliability of center of pressure measures of gait initiation time in healthy older adults: Effect of obstacle negotiation and cognitive load on reaction and anticipatory postural adjustment phases Volume 3(5): 5-5
doi:10.15761/pmrr.1000185 fatcat:jf2t4sniwnglnhqhge5y6zwggu