The basis for the relationship between physical stimulus and magnitude of psychological response in angular movements of the upper limbs was investigated. Participants compared movements to a standard location with movements to comparison locations and movements of a standard distance with movements of comparison distances. The results add to the controversy surrounding the explanations for the differences in psychological response magnitude of movements to locations and movements across distances. Data obtained from movements to locations and movements across distances indicated similar Weber ratios but different patterns for the just noticeable differences. The data of this and previous research suggest that the application of a prothetic continuum to arm movements is inappropriate. An alternative explanation of the differences in the perception of movements to locations and movements across distances is offered.

The purpose of this study was to determine which set of selected kinematic variables affected the speed of visually impaired residential youth in the sprint run. The subjects were 27 students, 16 males and 11 females, between the ages of 9.4 and 16.4 years. Film data were collected during two trials of the 50-m dash. A Fortran computer program produced nine variables from these digitized data. A multiple regression analysis was performed on the variables using running speed as the dependent variable. Results of a correlation matrix yielded five variables with significant bivariate correlations to running speed. Results of a regression analysis indicated that the cycle length and hip joint range of motion had significant effects on running speed. Implications for an increase in sprinting speed include increasing stride length via the generation of greater hip extension during the drive phase and a greater hip flexion during the recovery phase of sprint running.

This study was conducted to determine the predictive ability of rated perceived exertion (RPE) of mentally retarded (MR) young adults with respect to heart rate (HR) and workload (WL). Subjects were a group of 10 mentally retarded adults (M age = 21.20 yrs, M IQ = 50.5) and a control group of 10 nonretarded adults (M age = 21.18 yrs). The procedure involved the performance of a continuous multistage treadmill test using a modified Balke protocol. Rated perceived exertion and heart rate were recorded after each minute. Correlation coefficients for both RPE/HR and RPE/WL were significant for both groups. Tests for differences in RPE/HR and RPE/WL correlation coefficients between the two groups indicated significance for RPE/HR but none for RPE/WL. Regression analysis revealed that variation in RPE could be explained by variations in HR and WL. The association between rated perceived exertion and heart rate and rated perceived exertion and workload suggests the use of the Borg scale with mentally retarded individuals.

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