This study aimed to investigate the factorial structure of the physical fitness of male single-leg amputees (PSLAs) who have a positive, active lifestyle. It also aimed to develop a battery of tests for estimating the overall physical fitness level of PSLAs based on the factorial structure of physical fitness according to its feasibility in the field. Active male PSLAs (n=28; age=31.4±8.19) were examined. Twelve feasible items were selected using physical fitness components based on the International Committee for the Standardization of Physical Fitness Tests and previous PSALs studies. Factor analysis was applied to 13 variables that, in turn, comprised 12 variables on which a physical fitness test was performed; in addition, age variables were used to determine the factorial structure involved. Subsequently, multiple regression analysis was performed to obtain a linear regression equation using a representative variable of each factor in the factorial structures as an independent variable and a first-principal component obtained by principal component analysis using each variable as a dependent variable. For factorial structures, fundamental physical strength, trunk/lower-extremity function, instantaneous function and shoulder joint muscle strength were obtained. The results of the multiple regression analysis involved 4 above-mentioned variables (vital capacity, jump-step-test, 20-m sprint, and the extension force of the shoulder joint in the horizontal position); and the first principal component score of each subject from all variables provided a significant linear regression equation (r=0.758, p<0.01). Although this study was performed on 28 subjects, the representative measurement variables obtained from the factorial structures allowed the development of a battery of tests for estimating the overall physical fitness level of the PSLAs in the field.
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