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Elevation gain (EG) is a significant contributor to the total workload in many endurance sports. Hence, the aim of this study was to evaluate the accuracy of elevation recording as assessed by popular sport watches. Eighteen participants walked and ran at different speeds in various weather conditions in two terrain types: on a hilly 2490 m course with a total EG of 90 m and on a flat 1200 m outdoor track with 0 m EG. In total, 180 recordings from each sport watch were analyzed and compared according to two processing types: filtered and unfiltered EG data. Compared to the reference values, regarding default settings, on hilly terrain, EG was underestimated by ?3.3 to ?9.8 %, and on flat terrain, EG was overestimated by 0.0–4.8 m per 1200 m. These errors could be reduced to ?3.3 to +0.4 %, when filtering conditions were adjusted according to the terrain. Gait speed (ranging from 1.47 to 4.89 m s?1) or fluctuations in weather conditions between- or within-trials did not influence EG accuracy. A straightforward comparison between manufacturers is hampered as the filter conditions set by default differ. In conclusion, all devices measure EG adequately; however, the displayed default feedback on EG data is not always the most accurate measurement. Consequently, accuracy in elevation recordings could be increased if users appropriately post-process EG data. 相似文献
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Rahel Bekele Maggie McPherson 《British journal of educational technology : journal of the Council for Educational Technology》2011,42(3):395-416
This research work presents a Bayesian Performance Prediction Model that was created in order to determine the strength of personality traits in predicting the level of mathematics performance of high school students in Addis Ababa. It is an automated tool that can be used to collect information from students for the purpose of effective group composition. During the study, attributes that affect performance in mathematics were identified and the sources of the data were analysed. Based on collected data, a predictive tool was developed and a 70.9% prediction accuracy was achieved vis‐à‐vis actual exam results. Further work and modification of the prediction model increased the level of prediction accuracy to 78.4%. The findings of this research provide an insight into the possible applications of uncertainty management techniques, particularly to address some of the conflicting results relating to the significance of factors affecting student performance of the mathematics subject. This has implications regarding methods of grouping learners for optimum performance. Future research may include a deeper exploration of factors related to performance and more specifically how the Bayesian predictive model can be incorporated for effective group formation. Furthermore, researchers might be able to extend the application of similar performance prediction models for other academic subjects. 相似文献
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Kate Ryan Kuhlman Andreas Maercker Rahel Bachem Keti Simmen Andrea Burri 《Child abuse & neglect》2013
The purpose of this study was to quantify the association between childhood traumatic experiences and geriatric depression (GDS) in a population of elderly who were exposed to severe childhood trauma. We aimed to identify the role of childhood maltreatment exposure in geriatric depression and the developmental and contextual factors that exacerbate this relationship. We interviewed 141 former indentured child laborers (58 females) about their experiences as children and their current depressive symptoms (Mage = 77, SD = 6.8). Participants provided their age, the year they were first indentured, duration indentured, current physical health, completed the Childhood Trauma Questionnaire (CTQ) and the Geriatric Depression Scale (GDS). Child maltreatment, specifically emotional abuse, was strongly associated with geriatric depression symptoms. These effects were specific to individuals who were removed from their biological families between the ages of 3 and 9 years, and for children who were indentured for 6–12 years. Finally, depression partially mediated the association between medical conditions and daily health impairment, but not for individuals “at risk” for depression by virtue of their maltreatment experiences. This study was conducted with a specific subpopulation of elderly and therefore may not generalize to all geriatric depression, nor to all generations or populations with exposure to childhood adversity. This study demonstrates the importance of using a developmental framework to understand how childhood maltreatment facilitates increased risk for the development of depression in late life. 相似文献
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Mark G. L. Sayers Caroline Bachem Pascal Schütz William R. Taylor Renate List Silvio Lorenzetti 《Journal of sports sciences》2020,38(9):1000-1008
ABSTRACTThis research assessed the influence of various heel elevation conditions on spinal kinematic and kinetic data during loaded (25% and 50% of body weight) high-bar back squats. Ten novice (mass 67.6 ± 12.4 kg, height 1.73 ± 0.10 m) and ten regular weight trainers (mass 66.0 ± 10.7 kg, height 1.71 ± 0.09 m) completed eight repetitions at each load wearing conventional training shoes standing on the flat level floor (LF) and on an inclined board (EH). The regular weight training group performed an additional eight repetitions wearing weightlifting shoes (WS). Statistical parametric mapping (SPM1D) and repeated measures analysis of variance were used to assess differences in spinal curvature and kinetics across the shoe/floor conditions and loads. SPM1D analyses indicated that during the LF condition the novice weight trainers had greater moments around L4/L5 than the regular weight trainers during the last 20% of the lift (P < 0.05), with this difference becoming non-significant during the EH condition. This study indicates that from a perspective of spinal safety, it appears advantageous for novice weight trainers to perform back squats with their heels slightly elevated, while regular weight trainers appear to realize only limited benefits performing back squats with either EH or WS. 相似文献
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Rahel Grüninger Inga Specht Doris Lewalter Wolfgang Schnotz 《European Journal of Psychology of Education - EJPE》2014,29(2):215-238
Until recently, museums mainly communicated well-established knowledge. Current science, however, is characterized by a rapid knowledge increase, so that we often have to deal with fragile and inconsistent knowledge. In order to develop exhibitions that encourage visitors to process information in a differentiated way, museums need to know how visitors deal with conflicting information. Furthermore, museum professionals need information on personal and situational factors that may promote the processing of such information. We tested whether conflict processing is influenced by personal characteristics such as situational interest, epistemological beliefs, tolerance of ambiguity, and self-efficacy on the one hand and by situational conditions such as the spatial arrangement of information on the other hand. In two science museums and one museum of cultural history, text pairs were displayed that described a topic from conflicting perspectives. The spatial distance between the two texts was manipulated. Semi-structured interviews and questionnaires captured the personal characteristics of 323 visitors and the way they dealt with conflicting information. The results showed that a majority of the visitors perceived a conflict, and a large proportion was willing to process the information at a deeper level. Sophisticated epistemological beliefs, a high tolerance of ambiguity, and high self-efficacy were found to promote situational interest in conflicting information. High situational interest, in turn, promoted a tendency to process deeply. Placing text pairs in close proximity had a positive effect on the processing depth in science museums but not in the museum of cultural history. A possible explanation lies in the higher density of additional and potentially interfering information in the science museums compared to the museum of cultural history. 相似文献
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