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281.
This article deals with kinematic and kinetic conditions in volleyball attack and identifies loads in the shoulder joint. Joint angles and velocities of individual segments of upper limb were measured with the use of the motion capture system XSENS. Muscle forces and loads in skeletal system were calculated by means of mathematical model elaborated in AnyBody system. Spikes performed by players in the best and worst way were compared with each other. The relationships were found between reactions in shoulder joint and flexion/extension, abduction/adduction and rotation angles in the same joint and flexion/extension in the elbow joint. Reactions in shoulder joint varied from 591 N to 2001 N (in relation to body weight [BW] 83–328%).
The analysis proved that hand velocity at the moment of the ball hit (which varied between 6.8 and 13.3 m s–1) influences on the value of reaction in joints, but positions of individual segments relative to each other are also crucial. It was also proved in objective way, that position of the upper limb during spike can be more or less harmful assuming that bigger reaction increases possibility of injury, what can be an indication for trainers and physiotherapists how to improve injury prevention. 相似文献
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Charlotte Dietrich Syed A. Rahim Gloria D. Feliciano Robert C. Hornik Godwin Chu Daniel Lerner 《Communication Booknotes Quarterly》2013,44(6):65-66
Charlotte Dietrich, Der Rundfunk in Afrika An fang der Siebziger Jahre: Strukturen and Daten (Broadcasting in Africa in the Early Seventies: Structures and Data) (Department of Mass Communication, University of Salzburg, Sigmund Haffner Gasse 18, A-5020 Salzburg, Austria---$5.00, paper, plus cost of shipping) Communication Policy and Planning for Development: A Selected Annotated Bibliography by Syed A. Rahim (285 pp., October 1976, price not given, paper) An Overview of Communication Research in Asia: Status, Problems and Needs by Gloria D. Feliciano (20 pp., June 1973, on request, paper) Mass Media Use and the “Revolution of Rising Frustrations:” A Reconsideration of the Theory by Robert C. Hornik (27 pp., July 1974, on request, paper) Communication and Development in China (Communication Monograph No. 1), by Godwin Chu, et al. (116 pp., September 1976, price not given, paper) Communication in the Pacific, edited by Daniel Lerner and Jim Richstad (96 pp., June 1976, price not given paper) The Use of Radio in Adult Literacy Education, by Richard C. Burke (116 pp., £1.50 or about $2.40, paper) Programmed Instruction for Literacy Workers, by Sivasailam Thiagarajan (136 pp., £1.95 or about $3.12, paper) Mass Communication in Malaysia, compiled by Lim Huck Tee and V.V. Sarachandran (91 pp., 1975, 12 Singapore dollars outside Asia) Mass Communication in India, compiled at the Indian Institute of Mass Communication (216 pp., 1976, 18 Singapore dollars outside Asia) 相似文献
286.
Physical Education Teacher Attitudes toward Fitness Tests Scale: Cross-Revalidation and Modification
Xiaofen D. Keating Jianmin Guan Robert H. Ferguson Li Chen Dwan M. Bridges 《Measurement in physical education and exercise science》2013,17(2):72-87
This study aimed to provide further evidence of validity and reliability for the Physical Education Teacher Attitudes toward Fitness Tests Scale (PETAFTS), which consisted of affective and cognitive domains. There were two subdomains in the affective domain (i.e., enjoyment of implementing fitness tests and enjoyment of using test results) and one domain in the cognitive domain (i.e., beliefs in the usefulness of test results). Full-time physical education teachers (N?=?469) from two southwestern states in the United States participated in the study. Reliability and validity of the scale were examined. Alphas were computed for the entire 16-item scale, the affective and cognitive domains, and the two subdomains, respectively, to test the reliability. Confirmatory factor analysis (CFA) was employed to investigate the construct validity. The commonly used CFA indices, such as the chi square (χ2), the comparative fit index (CFI), the Tucker-Lewis Index (TLI), the goodness of fit index (GFI), and the root mean square error of approximation (RMSEA), were used to assess the fit of the data to the model. The CFA results suggested that the data from the study did not fit the original model proposed by Keating and Silverman (2004b), resulting in the elimination of item 3. The fitness of the data to the model was improved and deemed acceptable. More studies on the reliability and validity of the scale are needed in the future in order to use the scale with more confidence. 相似文献
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Longobardi Claudio Ferrigno Serena Gullotta Giulia Jungert Tomas Thornberg Robert Marengo Davide 《European Journal of Psychology of Education - EJPE》2022,37(2):507-508
European Journal of Psychology of Education - A Correction to this paper has been published: https://doi.org/10.1007/s10212-021-00555-z 相似文献
289.
Innovative Higher Education - 相似文献
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