| Summary: | 碩士 === 國立陽明大學 === 物理治療學系暨研究所 === 94 === Purpose：To investigate the effect of secondary task on the temporal-distance and the kinematic characteristics of the gait in young adults and elders.
Methods：Twenty-one young adults and 12 elders participated in this study. Eight walking conditions with randomized procedure were performed by each subject: (1)walk at preferred speed;(2)walk while counting backward by three from a random number; (3)walk while performing 8-digit-memorization;(4)walk while performing clock face task; (5)walk while performing word generation task; (6)walk while simultaneously performing a motor sequence of opposition of the thumb to the second, third, fourth and the fifth finger of the dominant hand; (7)walk while simultaneously performing a motor sequence of opposition of the thumb to the second, third, fourth and the fifth finger of the non-dominant hand; and (8) walk while performing the hand clapping task with each hand alternately. Statistical analysis：Two-way ANOVA with repeated measures was used to compare the difference of between single and dual task conditions, and between young adults and elders. Results：Significant main effects among 8 different walking conditions (p<0.05), main effect among group (p<0.05), and interaction effects between task conditions and group (p<0.05) on most of temporal-distance and lower extremity joint excursion ranges of gait in young adults and elders. All of the secondary tasks resulted in significantly slower speed, decreased cadence, decreased stride length, decreased swing phase, decreased single-limb-support phase, increased stance phase, increased double-limb-support phase, and decreased lower-extremity joint excursion ranges in the sagittal plane during a gait cycle between young adults and elders. But the gait performance of all subjects was interfered significantly more in cognitive task conditions. Young adults had higher corrected rate than elders when performing cognitive secondary tasks. Significant difference was found between young adults and elders when performing 8-digit-memorization task and clock-face task. All subject perceived difficulty while walking with a secondary task, especially while walking with cognitive tasks.
Conclusions：Walking with a secondary task would interfered the temporal-distance and the kinematic characteristics of the gait in young adults and elders, especially adding a cognitive task. Performance of the secondary task was also interfered during dual-task conditions.
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