ISSN:0309-1902    

DOI:10.3109/03091908909030213

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Six male subjects took part in a pilot study on a stationary wheelchair ergometer. They propelled the ergometer at a speed of 0·55, 0·83, 1·11 and 1·39 m/s. The speed increased every 3 min. Inertia and friction force were adjusted proportional to body weight. Every third minute 750 samples of the torque and velocity signals were digitized at a sampling rate of 100 Hz. From the signals mean external power output (Pmean), peak power (Ppeak), mean torque (Mmean) and peak torque (Mpeak), work/cycle,‘time-to-peak torque’(TTP), cycle duration (CT), push time (PT) and recovery time (RT) were determined in relation to mean velocity (speed).For the mean velocity range studied, analysis of variance (P>0·05) revealed significant increments in Ppeak, Mpeak, Pmeans, Mmeanand work/cycle with increasing mean velocity, whereas CT and PT showed a significant decrease. TTP showed a decrease with speed which, however, was not statistically significant. The RT showed no significant variation as well. Our previous research into propulsion techniques mainly focused on movement frequency and timing and was conducted during wheelchair ambulation on a motor driven treadmill. Despite considerable interindividual variation in terms of movement pattern, current and previous studies showed similar trends in the timing pattern (cycle, push, recovery duration) with respect to speed. Theoretical considerations regarding variations in peak torque and work/cycle with respect to velocity are supported by the current results. Both torque and work/cycle are important technique parameters and of relevance in speed regulation. The data also suggest that wheelchair ambulation can be validly simulated and studied with the special purpose wheelchair ergometer. Between-subject variation suggests the effect of wheeling experience and needs further research.

ISSN:0309-1902    

DOI:10.3109/03091908909030214

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Many of the handicapped who could use a hand-driven wheelchair do not have sufficient arm force, arm movement and/or endurance, for proper propulsion. Furthermore, there are users of electric wheelchairs who still have some arm functions and strength. In some cases a hand-driven chair, which can be propelled with reduced arm power, could be a better solution. By means of simulation, a study has been carried out to investigate the possibility of propelling a wheelchair by means of hybrid powering. Hybrid powering can be defined as a combination of arm force and electrical power. Using this hybrid principle, the necessary arm force can be decreased.

ISSN:0309-1902    

DOI:10.3109/03091908909030215

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030216

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030217

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor