Seventeen individuals (ages 11–30 years), all wheelchair users, were classified as active or sedentary. Peak mechanical power, heart rate (HR), and rating of perceived exertion (RPE) were determined during continuous, incremental all-out arm ergometry. Subjects were asked to wheel on an oval track at prescribed speeds, and one month later they repeated this task. All subjects could distinguish among prescriptions, as judged from HR and wheeling velocities. However, the active subjects chose higher speeds (by 0.8–1.3 m/s), a wider range of speeds, and could better distinguish among sequential RPE levels than did the sedentary subjects. All subjects chose wheeling velocities higher than expected from their originally established HR-on-RPE regression. One-month retention was high and similar between groups. Individuals who use wheelchairs can discriminate among wheeling intensities as prescribed using the RPE scale and have excellent retention for at least one month.
Dianne S. Ward, Oded Bar-Or, Patti Longmuir and Karen Smith
P.R. Rougier, S. Berger, S. Barral and O. Rachet
To assess the postural strategies developed over the first 2 months following surgery by ACL patients during rehabilitation and highlight the sensory-motor impairment recovery, 21 patients were measured at three timeframes. Three two-legged standing conditions were assessed: with the eyes open, with the eyes closed either wearing or not wearing a knee orthosis. The results indicate that the weight-bearing asymmetry, initially observed (i.e., 56–44% of body-weight), disappeared progressively during rehabilitation (51–49%). The comparison of the plantar center-of-pressure displacements under both sound and operated legs demonstrated noticeable differences that also tended to decrease but without reaching a matched behavior during the last measures. These effects were seen in both eyes open and eyes closed conditions with the greatest effects in the latter condition. Wearing a knee orthosis inferred no particular changes in the postural control behaviors. These data could be used as benchmarks for highlighting the effects on undisturbed postural control of various surgery techniques and/or rehabilitation protocols.
Noam Eyal, Michael Bar-Eli, Gershon Tenenbaum and Joan S. Pie
The aim of this study was to examine whether outcome expectations can be generalized from one defined task to other tasks. A deception paradigm was employed in which outcome expectations were manipulated. High, low, or medium expectations toward performing five tasks, which gradually increased in complexity and shared a common skill, were manipulated. Ninety adult males were randomly assigned to manipulation groups. A within-subjects repeated measures ANOVA indicated that those manipulated by medium expectations showed elevated perceptions of outcome expectations. Their performance, however, was superior only in the two tasks most similar in complexity to the initial task. On the less similar tasks, the differences among the groups were insignificant. A generalization effect can therefore be demonstrated on outcome expectations and performance to a certain degree of task complexity. Implications of the superior performance of participants manipulated to produce medium outcome expectations are discussed.