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Fabricio Anicio de Magalhaes Giorgio Gatta Silvia Fantozzi 《Journal of sports sciences》2015,33(7):732-745
The use of contemporary technology is widely recognised as a key tool for enhancing competitive performance in swimming. Video analysis is traditionally used by coaches to acquire reliable biomechanical data about swimming performance; however, this approach requires a huge computational effort, thus introducing a delay in providing quantitative information. Inertial and magnetic sensors, including accelerometers, gyroscopes and magnetometers, have been recently introduced to assess the biomechanics of swimming performance. Research in this field has attracted a great deal of interest in the last decade due to the gradual improvement of the performance of sensors and the decreasing cost of miniaturised wearable devices. With the aim of describing the state of the art of current developments in this area, a systematic review of the existing methods was performed using the following databases: PubMed, ISI Web of Knowledge, IEEE Xplore, Google Scholar, Scopus and Science Direct. Twenty-seven articles published in indexed journals and conference proceedings, focusing on the biomechanical analysis of swimming by means of inertial sensors were reviewed. The articles were categorised according to sensor’s specification, anatomical sites where the sensors were attached, experimental design and applications for the analysis of swimming performance. Results indicate that inertial sensors are reliable tools for swimming biomechanical analyses. 相似文献
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Information Retrieval Journal - On the quest of providing a more natural interaction between users and search systems, open-domain conversational search assistants have emerged, by assisting users... 相似文献
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This article examines the performance of the pre-election pollsin Portugal since 1991 and attempts to determine some of thecommon causes of poll inaccuracy in both National Assembly andEuropean Parliament elections. The analysis of poll resultsin this period reveals marked improvements in poll accuracysince 1991, which have brought it to levels that, today, arecomparable to those found in nations where the practice of bothsurvey research and opinion polling is longer and more established.No evidence of a systematic bias against any of the major partiesis found, and sources of error are congruent with those foundelsewhere. However, large errors remain the norm in polls pertainingto European Parliament elections, suggesting a shared inabilityof Portuguese polling organizations in dealing appropriatelywith the problems caused by low turnout and ‘landslide’elections. 相似文献
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