Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
The relationship between anthropometric factors and BMD of lumbar spine in athletic and non-athletic premenopausal women
Mohammad Shabani,Abbasali Gaeini,Fatemeh Sajedifar
Zahedan Journal of Research in Medical Sciences , 2012,
Abstract: Background: It has been shown that body weight affects on Bone Mineral Density (BMD). Body weight composed of Fat Mass (FM) and Lean Body Mass (LBM), each of them affects on BMD differently. The purpose of this study was to determine the relationship between anthropometric factors (FM, LBM and BMI) and BMD of lumbar spine in athletic (runners) and non athletic premenopausal women. Materials and Method: The subjects included 15 female athletes and 15 female non-athletes (30-45 years). All female runners (experimental group) were running 8 km in each session, 3 sessions per week for at least 4 years. However, the control group (female non-athletes) had no specific sport activity. Body Mass Index (BMI) of subjects was calculated manually. BMD, FM and LBM also measured by using dual-energy X-ray absorptiometry (DEXA). Results: The results showed that in the experimental group there is a significant relationship between LBM and BMD of lumbar spine and in the control group, FM and BMD of lumbar spine were related tp each other significantly. The results also showed that there is not relationship between BMI and BMD of lumbar spine in the two groups.Conclusion: The authors suggest that LBM and FM may predict respectively BMD of lumbar spine in athletic and non-athletic pre-menopause women
Towards Conceptual Multidimensional Design in Decision Support Systems  [PDF]
Olivier Teste
Computer Science , 2010,
Abstract: Multidimensional databases support efficiently on-line analytical processing (OLAP). In this paper, we depict a model dedicated to multidimensional databases. The approach we present designs decisional information through a constellation of facts and dimensions. Each dimension is possibly shared between several facts and it is organised according to multiple hierarchies. In addition, we define a comprehensive query algebra regrouping the more popular multidimensional operations in current commercial systems and research approaches. We introduce new operators dedicated to a constellation. Finally, we describe a prototype that allows managers to query constellations of facts, dimensions and multiple hierarchies.
Anthropometric record cards used at Family Health Support Centers: What should be measured and why?
Marcius de Almeida Gomes,Carmem Cristina Beck,Maria de Fátima da Silva Duarte,Edio Luiz Petroski
Revista Brasileira de Cineantropometria e Desempenho Humano , 2009,
Abstract: Anthropometry is an important instrument for implementing professional practices in the public health care. In view of the participation of physical education teachers at Family Health Support Centers, the use of anthropometric methods becomes necessary in order to increase its contribution to health-care initiatives. Therefore, this study aims at proposing the application of anthropometry at Family Health Support Centers, indicating procedures for the public health-care environment and considering the principles used for health promotion in Brazil. Besides detecting health risk factors, the application of anthropometry should highlight health-care promotion strategies, so that it allows the involved professionals to mediate control and preventive measures through effective health-care education.
Biometeorological influence on motorcyclists and bicyclists trauma
Gaji? Vladimir,Milojevi? Dragan,Ra?kovi? Aleksandar,Smailagi? Jasminka
Srpski Arhiv za Celokupno Lekarstvo , 2011, DOI: 10.2298/sarh1104185g
Abstract: Introduction. Biometeorological circumstances have great influence on all traffic participants, especially on reflexes, movement coordination and perception ability, increasing the number of accidents. Motocyclists and bicyclists are specific participants in traffic, so their traumatism has its own special characteristics. Objective. The aim of this study was to establish biometeorological influence on motorcyclists and bicyclists accidents. Methods. Comparative analysis of everyday biometeorological phases for the city of Kragujevac determinated by the Republic Hydrometeorological Service of Serbia and motorcyclists and bicyclists accident evidence received from Kragujevac traffic police for the period 2004-2008. Results. There were 5,180 traffic accidents in this period, with 180 accidents in which 77 motorcyclists and 116 bicyclists were knocked down. Most of the accidents were in 2008 (53) and the least in 2005 (28). Most accidents occurred during August (28) and between 19.00 and 20.00 hours (18). There were no accidents during January, between 04.00 and 06.00 hours. There were 85% accidents in the urban area. Most of 169 males were aged 16-20 and 21-25 years (20 and 21). Most of 24 females (6) were aged 11-15 years. Those who caused the accident mostly sustained injuries due to improper speed limit (31), while the victims due to the disrespect of street-crossing priorities (32). Forty-one motorcyclists and 85 bicyclists suffered mild body injuries. Thirty-one motorcyclists and 27 bicyclist suffered severe injuries. Five motorcyclists and four bicyclists ended lethally. Most accidents happened in biometeorological phases 9 (63), 4 (32) and 1 (31). Conclusion. Statistical analysis showed a significant correlation between accidents and biometeorological phases, with most accidents occurring during stabile warm weather and rapid penetrations of cold fronts, and with a sudden switch of weather conditions.
Effects of wearing a lumbosacral support on velocity and torque of lumbar spine during three-dimensional trunk motion  [cached]
Vahid Samadi,Saeed Talebian,Gholam Reza Olyaei,Mehdi Sadeghi
Koomesh , 2011,
Abstract: Introduction: The use of back support is one of the common methods aimed to prevent low back pain. The purpose of the present study was to investigate the effect of wearing a lumbosacral support on lumbar spine velocity and torque in six directions during combined trunk motion. Materials and Methods : In this interventional study, 30 young healthy men were selected simply from convenient samples. They were asked to stand in Isostation B200 system and perform three-dimensional trunk motion against a resistance of 50% of maximal voluntary contraction torque while wearing or not wearing a lumbosacral support. Under each condition of test, five successive motions of trunk were performed in downward direction (as flexion, right lateral flexion, and right rotation) and upward direction (as extension, left lateral flexion, and left rotation), and the variables of average velocity and average torque were recorded during motion. Results : With the use of a lumbosacral support, average velocity was significantly increased in flexion (P=0.015) and extension (P=0.005), but no significant changes were found in other directions (P>0/05). Back support decreased average torque of right rotation significantly (P=0.006), but did not significantly changed this variable in other directions (P>0/05). Conclusion : Wearing a lumbosacral support can increase velocity in sagittal plane. Decreased rotation torque of trunk, as a result of using a back support, may reduce the twisting forces on lumbar spine joints.
An Intelligent Tool to Support Requirements Analysis and Conceptual Design of Database Design
Wang Nengbin,Liu Haiqing
计算机科学技术学报 , 1991,
Abstract: As an application of artificial intelligence and expert system technology to database design,this paper presents an intelligent design tool NITDT,which comprises a requirements specification language NITSL,a knowledge representation language NITKL,and an inference engine with uncertainty reasoning capability.NITDT now covers the requirements analysis and conceptual design of database design.However,it is possible to be integrated with another database design tool,NITDBA,developed also at NIT to become an integrated design tool supporting the whole process of database design.
Biomechanical effects of sitting with adjustable ischial and lumbar support on occupational low back pain: evaluation of sitting load and back muscle activity
Mohsen Makhsous, Fang Lin, James Bankard, Ronald W Hendrix, Matthew Hepler, Joel Press
BMC Musculoskeletal Disorders , 2009, DOI: 10.1186/1471-2474-10-17
Abstract: A laboratory test in low back pain (LBP) and asymptomatic subjects was designed to test the biomechanical effect of using the Off-Loading sitting posture. The load and interface pressure on seat and the backrest, and back muscle activities associated with usual and this Off-Loading posture were recorded and compared between the two postures.Compared with Normal (sitting upright with full support of the seat and flat backrest) posture, sitting in Off-Loading posture significantly shifted the center of the force and the peak pressure on the seat anteriorly towards the thighs. It also significantly decreased the contact area on the seat and increased that on the backrest. It decreased the lumbar muscle activities significantly. These effects are similar in individuals with and without LBP.Sitting with reduced ischial support and enhanced lumbar support resulted in reduced sitting load on the lumbar spine and reduced the lumbar muscular activity, which may potentially reduce sitting-related LBP.Occupational low back pain (LBP) is alarmingly common[1,2], with a 100 million workdays lost in the United States each year[3]. As the leading cause of disability in individuals less than 50 years old[4], LBP imposes a tremendous economic burden, with an estimated annual productivity lost of $28 billion in US[5]. Although the incidence of occupational back injury has been decreasing lately[6], the percentage of LBP among all the occupational back injury still is increasing[7] and occupational LBP remains the primary problem for US industry[6,7]. A number of occupational risk factors have been cited[8,9], prolonged sitting, in combination with awkward postures, has been confirmed to increase the likelihood of having LBP[10]. In fact, occupations which require prolonged sitting have a 3.2 relative risk (95% confidence interval) of LBP within the first year of employment[11]. Two frequently cited risk factors of LBP from occupational sitting are: 1), prolonged static sitting [8,9,12
Psychological Aspects of Risk and Aggression among Motorcyclists - "Mad Max" Syndrome
Ryszard Makarowski, Aleksandra Peplińska, Micha Nowopolski
Polish Psychological Bulletin , 2010, DOI: 10.2478/v10059-010-0010-6
Abstract: The primary objective of this study was the psychological examination of a group of Polish motorcyclists against a group of students and graduates of Technical Universities. This work poses a question regarding the differences in temperament, aggression and the level of risk between motorcyclists and the control group. The second question was whether it was possible to create a typology of Polish motorcyclists taking into account the variables describing risk, temperament and aggression. This study used the Pavlovian Temperamental Scale (Strelau, Zawadzki, 1998), Stimulating-Instrumental Risk Inventory, SIRI 2001 (Zale kiewicz 2001), Multifactor Risky Behavior Scale (Studenski 2004), Unhealthy behavior Inventory (Makarowski 2008) and the Buss and Perry Aggression Questionnaire (1992). The tests were performed on 267 motorcyclists and 188 students and graduates of Technical Universities. A number of important differences was observed between the motorcyclists and the control group. Motorcyclists had a higher level of mobility of nervous processes and higher degree of excitation at the lower level of inhibitory processes. In terms of the measured level of risk they also had a higher level of stimulating, instrumental and unhealthy risk, at the lower levels of physical, social, ethical and financial risk in relation to the control group. Cluster and confirmation analyses showed the existence of three sub-groups of motorcyclists: prevaricators, ones with a Mad Max syndrome, and adventurers. The confirmation analysis was carried out on an additional group of 243 motorcyclists.
A Conceptual Framework for the Electronic Performance Support Systems within IBM Lotus Notes 6 (LN6) Example  [cached]
The Turkish Online Journal of Distance Education , 2005,
Abstract: A Conceptual Framework for the Electronic PerformanceSupport Systems within IBM Lotus Notes 6 (LN6) Example Assoc. Prof. Dr. Servet BAYRAM Computer Education & Instructional Technologies Marmara University, TURKEYsbayram@marmara.edu.tr ABSTRACT The concept of Electronic Performance Support Systems (EPSS) is containing multimedia or computer based instruction components that improves human performance by providing process simplification, performance information and decision support system. EPSS has become a hot topic for organizational development, human resources, performance technology, training, and educational development professionals. A conceptual framework of EPSS is constructed under five interrelated and interdependent domains for educational implications. The domains of the framework are online collaboration, cost-effectiveness, motivation, service management, and performance empowering. IBM Lotus Notes 6 (LN6) is used as an example application tool to illustrate the power of this framework. The framework describes a set of relevant events based upon deductive analyses for improving our understanding of the EPSS and its implications on education and training. The article is also pointed out that there are some similarities between the EPSS’ and the LN6’s specific features within this conceptual framework. It can provide some guidelines and benefits to researchers, educators, and designers as well.
Effects of Body Height, Weight and Lumbar Support Prominence on Driver’s Lumbarloadings

- , 2015, DOI: 10.7652/xjtuxb201509019
Abstract: 在现有Christophy脊柱肌骨模型的基础上创建了可求解腰部关节力、肌肉载荷的驾驶员生物力学模型,通过Matlab-OpenSim联合仿真求解了驾驶员人椅接触界面接触反力及摩擦力,从关节反力及腰部肌肉负载的角度尝试解释了身高、体质量、腰靠凸起厚度对舒适度影响的内在机理。结果表明:驾驶员腰部载荷随体质量的增加近线性增加,但与身高的相关度较低;4 cm凸起腰靠支撑下的驾驶员较2 cm凸起腰靠支撑下的腰部肌肉群等效载荷平均降低了7.4%,腰部椎间关节力平均降低了18.6%。所提出的仿真方法可以实现不同腰靠支撑下腰部载荷的定量评估,适用于指导人机工程中座椅腰靠的舒适性设计。
This paper created a driver model that can estimate lumbar vertebral joint reaction forces and muscle forces based on Christophy musculoskeletal lumbar spine model, solved the contact interactions between driver and seat via Matlab??OpenSim co??simulations, and tried to explain inherent mechanism of effects of body weight, height and lumbar support prominence (LSP) on driving comfort with help of the estimated vertebral joint reaction forces and muscle forces. Results: lumbar loadings are almost linearly related to body weight, but have limited relation with body height. Lumbar muscle groups’ averaged loadings in balancing drivers’ posture under 4 cm LSP was 7.4% lower than that under 2 cm LSP. Similar, joint reaction force at lumbar level L4??L5 under 4 cm LSP was 18.6% lower than that under 2 cm LSP. The proposed method can achieve quantitative assessments of lumbar support’s effects which can help design of comfort lumbar support in car seats
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.