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On a kayak ergometer, an accurate simulation of the athlete-paddle-kayak system kinematics is essential for analysing the relationship between technique and performance. The purpose of this study
was to establish a strong relationship between performances on flatwater and performances on an ergometer by means of propulsive
force measurement and drag models. Two trials were performed by 12 kayakers in which they were first timed over 250 m of flatwater
kayaking (the reference test) and were then asked to perform a trial of the same duration on the ergometer with the same perceived
physical exertion. Three techniques for measuring propulsive force and three drag models generated nine combinations, which
were all evaluated for their ability to estimate kayak velocity. For each combination, the distance covered by the athlete
on the ergometer was simulated. A kayakers’ ergometer ranking was based on the average velocity in the ergometer trial. Both
distance and ranking were compared to the on-water results. The simulation with the best combination of force measurement
and drag model gave an accurate estimate of distance (253 ± 10.5 vs. 250 m) and ranking compared to the reference test. 相似文献
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This article aims to contribute to an emancipatory conceptual framework for EPs to draw upon when called to work with and/or speak of individuals labelled autistic. First, the widespread adherence to medicalised, inherently deficit-based discourses surrounding autism is critiqued, and considered as not uniformly beneficial for “clients” (parents, teachers and, above all, young people). The authors then utilise alternative critical constructions of autism, positioning those identified as autistic at the centre of a more transparent discursive (re)construction. This approach, it is argued, opens up spaces in which celebration of individual difference is as much a possibility as psychopathology, and supports practitioners to remain sensitive to complex forms of lived experience. The authors do not speak for the autistic community (or assume a coherence in viewpoint), but hope this article speaks to those labelled autistic (and to professionals) in a way that more established approaches may not. 相似文献
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Effectiveness of three‐dimensional digital animation in teaching human anatomy in an authentic classroom context 
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下载免费PDF全文 Nady Hoyek Christian Collet Franck Di Rienzo Mickael De Almeida Aymeric Guillot 《Anatomical sciences education》2014,7(6):430-437
Three‐dimensional (3D) digital animations were used to teach the human musculoskeletal system to first year kinesiology students. The purpose of this study was to assess the effectiveness of this method by comparing two groups from two different academic years during two of their official required anatomy examinations (trunk and upper limb assessments). During the upper limb section, the teacher used two‐dimensional (2D) drawings embedded into PowerPoint® slides and 3D digital animations for the first group (2D group) and the second (3D group), respectively. The same 3D digital animations were used for both groups during the trunk section. The only difference between the two was the multimedia used to present the information during the upper limb section. The 2D group surprisingly outperformed the 3D group on the trunk assessment. On the upper limb assessment no difference in the scores on the overall anatomy examination was found. However, the 3D group outperformed the 2D group in questions requiring spatial ability. Data supported that 3D digital animations were effective instructional multimedia material tools in teaching human anatomy especially in recalling anatomical knowledge requiring spatial ability. The importance of evaluating the effectiveness of a new instructional material outside laboratory environment (e.g., after a complete semester and on official examinations) was discussed. Anat Sci Educ 7: 430–437. © 2014 American Association of Anatomists. 相似文献
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Kinematic analysis is done by measurement of the position of bodies, followed by differentiation to get the accelerations
of the centres of mass, and it is widely used in sport research. Another common approach is to measure the forces directly.
Our intention here is to perform both a kinematic and a kinetic analysis of the same athlete-equipment system, in this case
an athlete on a sliding kayak ergometer, with the aim of exploring the errors that may occur with each measurement type. The
kayak ergometer with a sliding trolley, instrumented by seven uniaxial force sensors and two goniometers, was placed in a
filming area. The instrumentation was validated in the direction of the anteroposterior axis using Newton’s second law. Ten
athletes paddled at 92 strokes per minute, following a stationary phase. The comparison between the net force and the time-derivative
of the linear momentum indicated a friction level of about 20 N between the trolley and the frame. Other errors came mainly
from the inertial parameters of the trunk. A first analysis of contact forces shows a large inter-subject variability, in
particular for the forces applied to the footrest and the seat. 相似文献
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Mickael Benaim 《Research Policy》2018,47(5):901-910
Innovation studies has largely focused on technological assets, while leaving other sources and forms of innovation less tackled. Among this neglected corpus, this article stresses the important role played by symbolic value in the consumption and production processes of innovative goods and services. I explore especially Internet-memes that represent iconic productions of the Internet ‘lead culture’, which embed significant symbolic values. This article therefore, refers to the economic sociology and innovation management literature to emphasise the force of these creations of symbolic value by culture-lead communities, through their production of Internet-memes. I argue that Internet-memes represent a widespread source of innovation in various sectors (from cultural industries to less expect ones like finance). While exploratory, the present study extends the debate on the nature of innovation, its symbolic and cultural aspects and its diffusion processes. It ultimately suggests potential new paths for innovation policies to tackle these new forms of innovations. 相似文献
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The aims of this study were to investigate the differences in peak muscle activity and recruitment patterns during high- and low-velocity, concentric and eccentric, internal and external isokinetic shoulder rotations. Electromyographic activity of the rotator cuff and eight superficial muscles of the shoulder girdle was recorded on 25 healthy adults during isokinetic internal and external shoulder rotation at 60°/s and 240°/s. Peak muscle activity, electromyographic envelopes and peak isokinetic moments were analyzed using three-factor ANOVA and statistical parametric mapping. The subscapularis and serratus anterior showed moderate to high peak activity levels during each conditions, while the middle and posterior deltoids, upper, middle and lower trapezius, infraspinatus and supraspinatus showed higher peak activity levels during external rotations (+36.5% of maximum voluntary activation (MVA)). The pectoralis major and latissimus dorsi were more active during internal rotations (+40% of MVA). Only middle trapezius and pectoralis major electromyographic activity decreased with increasing velocity. Peak muscle activity was similar or lower during eccentric contractions, although the peak isokinetic moment increased by 35% on average. The subscapularis and serratus anterior appear to be important stabilizers of the glenohumeral joint and scapula. Isokinetic eccentric training at high velocities may allow for faster recruitment of the shoulder girdle muscles, which could improve joint stability during shoulder internal and external rotations. 相似文献
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