Temporal Coordination of the Sit-to-Walk Task in Subjects With Stroke and in Controls

Abstract

Frykberg GE, Åberg AC, Halvorsen K, Borg J, Hirschfeld H. Temporal coordination of the sit-to-walk task in subjects with stroke and in controls. Objectives To explore events and describe phases for temporal coordination of the sit-to-walk (STW) task, within a semistandardized set up, in subjects with stroke and matched controls. In addition, to assess variability of STW phase duration and to compare the relative duration of STW phases between the 2 groups. Design Cross-sectional. Setting Research laboratory. Participants A convenience sample of persons with hemiparesis (n=10; age 50–67y) more than 6 months after stroke and 10 controls matched for sex, age, height, and body mass index. Interventions Not applicable. Main Outcome Measures Relative duration of STW phases, SE of measurement in percentage of the mean, and intraclass correlation coefficients (ICCs). Results Four STW phases were defined: rise preparation, transition, primary gait initiation, and secondary gait initiation. The subjects with stroke needed 54% more time to complete the STW task than the controls did. ICCs ranged from .38 to .66 and .22 to .57 in the stroke and control groups, respectively. SEs of measurement in percentage of the mean values were high, particularly in the transition phase: 54.1% (stroke) and 50.4% (controls). The generalized linear model demonstrated that the relative duration of the transition phase was significantly longer in the stroke group. Conclusions The present results extend existing knowledge by presenting 4 new phases of temporal coordination of STW, within a semistandardized set-up, in persons with stroke and in controls. The high degree of variability regarding relative STW phase duration was probably a result of both the semistandardized set up and biological variability. The significant difference in the transition phase across the 2 groups requires further study.