Wheelchair Forces. The Forces And Kinematics Involved In Self Essay

Wheelchair Forces. The Forces And Kinematics Involved In Self Propelling A Wheelchair - Essay Example The study took place at the Stanmore Clinical Research Facility (SCRF) at the Royal National Orthopaedic Hospital (RNOH), Stanmore. All participants gave informed consent to participate in the study. (Refer to Appendix __ ). The generation of forces were gathered through the front castors of the wheelchair and through the push rim. The forces generated are then recorded and analysed to investigate the hypothesis stated. The wheelchair users P:C Ratio was then calculated to establish whether the users exceeded their capacity when performing such tasks and whether Rear Axle Position (RAP) was found to influence this. As there are no existing methods for testing dynamic wheelchair stability of a manual wheelchair, an instrument was developed. Consequently, a force sensitive castor was designed to look at this pattern in more detail. The chosen model was a 17" Quickie GPV, rigid frame lightweight wheelchair. The model was chosen as the most adaptable size for most test participants and was then configured to suit each individual's needs. The wheelchair weighs 18kg with nearly 7kg of added weight due to an attached equipment. The wheelchair is fitted with 25" solid tyres to accommodate the Smart Wheel technology and 5" solid castors. There is a 3-degree camber on the rear wheels. Figure 1. Quickie GPV Wheelchair Each participant was set up in the Laboratory's test wheelchair. Only one wheelchair could be used as the instrumentation was not interchangeable between wheelchairs. 1.3.3 Development of the Castor Force Transducer An earlier work at ACDS (spell out acronym) (WOWSUP, 2005) using a wheelchair Ergometer showed that there was a substantial weight shift between castors and rear wheels during the propulsion cycle, which subsequently increased with the pushing resistance. The Ergomenter used force plates beneath the front castors during propulsion. The study explored what happened to the Ergometer when users propelled their wheelchairs to perform functional activities. A force sensor was integrated into the castor stem of the wheelchair to examine weight shift during functional mobility. This was initially constructed in combination with the castor stem and a number of washers to accommodate its size. Figure 2. The Wheelchair Ergometer 1.3.4 Calibration of the castor force transducer This was completed by loading the wheelchair with known masses and recording the voltage output from both the force transducer in the castor and the force plate underneath it (force plates already calibrated for previous testing). This calibration produced 2 curves in order to demonstrate whether a linear relationship was achievable

Human Resources Assignment Example | Topics and Well Written Essays - 1000 words

Human Resources - Assignment Example Human Resources By choosing random individuals who are completely unaware that they are participating in a study realistically has the greatest likelihood of providing the most natural and uninhibited responses and reactions. People who are being watched, often, behave much differently than those who do not. So that part is an agreeable means to attain information that is completely uninfluenced by the research. However, by having no in-depth or personal knowledge of the test subjects there is now way of knowing if there are extenuating circumstances or variables that may make them poor candidates for such study. For example, some people suffer from a psychological or medical issues or inability to use the restroom when others are present, this preexisting condition could contribute to the study’s intention in a negative way; there slow or complete inability to urinate may have nothing at all to do with arousal. â€Å"Although the parameters of these measures have not been extensively studied, the present study implies that they have some construct validity as indicators of arousal† (Middlemist, Knowles, and Matter 544-545). Here they already are attributing the results that they gained as indicative of validation of the hypothesis that arousal can occur from the nearness of other men when urinating in a public restroom. However, the results of their study do not, however, randomly the participants selected, are not representative of the whole of society. Researchers said, that â€Å"†¦during tests of the experimental procedures, none of the test subjects had any suspicions about the confederate's activity† (Middlemist, Knowles, and Matter 545). They repeat this point multiple times in the course of the article. That the lack of knowledge of the test subjects that somehow, again, speaks to the universality of their results, which there is no direct evidence of. In fact, re gardless of the â€Å"promising† results they recorded there is actually no guaranteeing evidence that men are, often, aroused when near to others while urinating at a public urinal; and whether or not the slowness to begin urination or the shortness of its duration has anything to do with arousal, since most men complain of discomfort and unpleasantness associated with personal space violations in public restrooms. †¢Did the authors have any other purposes for sampling besides trying to enable generalization to a population? If so, describe this (these) purpose(s) Well there is a duality in their overall efforts to begin with. Although this study is specifically geared to determining the potential arousal responses of men when urinating while their space is invaded, there are other accessory purposes mentioned. Firstly, are the greater studies being attributed to invasion of personal space. Most of those studies have already indicated that there may be biological reacti on that can occur that might interfere with the immediacy and duration of urination that can be