| Summary: | 碩士 === 國立臺東大學 === 體育學系碩士班 === 98 === This study aimed to investigate the task constraint (balance and degrees of freedom of movement) and the organism constraint (different age and arm length) for perceived reachability. Eighty participants (7, 9, 11, and 23 years old) were recruited according to the 25% (short-armed, N=10 for each age) and 75% (long-armed, N=10 for each age) of normal height. Each participant was tested visually, estimating reachability with a rope-and-pulley system. The measurement of the body-scale ratio (arm length and actual reaching distance) was tested with three-way analysis of variance with repeated measures (ANOVA) for tasks：(1) balance constraint × age × arm length and task (2)degree of freedom constraint × age × arm length respectively. The significance level is set at α=.05. The results of this study were as following.
There was no interaction between three factors. The body-scaled ratio affected by balance constraint. In the task constraint, difference between age and arm length groups was found only in one degrees of freedom. Because of the different contexts of task constraints, it showed diverse body-scale ratio (calculated by arm length) of adults and children and was inconsistent with body-scale ratio (calculated by actual reaching distance) among adults and 7-year-old children.
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