A study was conducted to examine the relationship between subjective and objective measures of mental imagery control. Eighty college undergraduates completed a battery of imagery tests and self-report measures to examine whether questionnaires that purport to measure imagery control or dynamic imagery ability (imagery of movement) would show a stronger relationship with objective measures of mental manipulation than would subjective measures that tap vividness of static imagery. Neither subjective measures of movement imagery nor subjective measures of stationary imagery showed meaningful relationships with objective measures of visuospatial manipulation. Additionally, subjective and objective imagery measures generally tended to dissociate. Basic component skills thought to be involved in mental manipulation, however, showed a much stronger relationship with the objective imagery tasks than did the self-report questionnaires. Findings suggest that subjective measures of imagery control do not tap the same cognitive processes involved in objective tests that require accurate imagery manipulation.

To examine the properties of the Rehabilitation Therapy Engagement Scale (RTES), a new scale developed to assess patient engagement in physical and occupational therapies in the acute rehabilitation setting quantitatively. Design: Psychometric analysis to test the reliability and validity of the RTES in a Midwestern acute rehabilitation facility. Participants: 75 individuals with acquired brain injury admitted to an acute rehabilitation program in a Midwestern urban setting. Main Outcome Measures: Physical therapists (PTs) and occupational therapists (OTs) completed a rating scale designed to measure each patient's level of engagement, or involvement, in therapy. Functional status at admission and discharge was measured with the Motor and Cognition scales of the Functional Independence Measure (FIM;

This study evaluated the feasibility, safety, and findings from a protocol for exercise-bicycle ergometry in subacute-stroke survivors. Of 117 eligible candidates, 14 could not perform the test and 3 discontinued because of cardiac safety criteria. In the 100 completed tests, peak heart rate was 116 ± 19.1 beats/ min; peak VO 2 was 11.4 ± 3.7 ml • kg • min-1 , peak METs were 3.3 ± 0.91, exercise duration was 5.1 ± 2.84 min., and Borg score was 14 ± 2.6. Among 71 tests, anaerobic threshold was achieved in 3.0 ± 1.7 min with a VO 2 of 8.6 ± 1.7 ml • kg • min-1. After screening, this protocol is feasible and safe in subacutestroke survivors with mild to moderate deficits. These stroke survivors have severely limited functional exercise capacity. Research and clinical practice in stroke rehabilitation should incorporate more comprehensive evaluation and treatment of endurance limitations.

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In ethylene copolymers isolatedCH2CHRCH2 groups undergo a glass transition at about −10 to −50°C., the exact temperature depending upon the nature of R. For any given copolymer the temperature of the transition remains reasonably constant over a broad composition range at high ethylene contents. At high comonomer content the transition rises with composition along the line drawn between the glasstransition temperature of polyethylene and that of the homopolymer of the comonomer in question. A second glass transition is also observed in ethylene copolymers at about −125°C. over the whole composition range. This transition corresponds to motion of CH2 sequences of three to five or more in the main chain. The temperature position of this transition is usually independent of the nature of the rest of the chain. The behavior of ethylene copolymers is quite different from that of normal vinyl copolymers, where only a single glass transition is observed for each composition and where the temperature position of the transition changes uniformly with composition along the line drawn between the glass transitions of the respective homopolymers. It is concluded that the motions involved in the glass transitions of the main chain CH2 sequences and of isolated CH2CHRCH2 groups in ethylene copolymers are localized, involving only a few carbon atoms. In the case of the normal vinyl copolymers, on the other hand, the motion at the transition appears to be a long‐range motion involving a great many chain carbon atoms and cooperative motion of the pendent groups. This change in the nature of the motion involved at the glass transition in going from high ethylene content copolymers to low ethylene content or vinyl copolymers appears to arise because of steric hindrance and/or restrictive dipolar forces between the pendent groups of the CH2CHRCH2 segments in those cases were they are not isolated from each other. Finally, it is concluded that all vinyl homopolymers would have glass transitions in the −10 to −50°C. range if steric hindrance between the side groups did not occur. It is shown that as the pendent group becomes less bulky or is further separated from the main chain by CH2groups the glass transition temperature decreases presumably towards the −10 to −50° range characteristic of the transition of isolated CH2CHRCH2 groups.