The geometric curvature of the spine during the sirshasana,the yoga’s headstand     

Mário Hebling Campos  Nayane Martins Giraldi  Paulo Gentil  Claudio Andre Barbosa de Lira  Carlos A. Vieira  Marcelo Costa de Paula 《Journal of sports sciences》2017,35(12):1134-1141

This study analysed the behaviour of the geometric curvature of the spine during sirshasana. The position of dorsal retroreflective markers was computed via stereophotogrammetric analysis in six males and five females (29.4 ± 8.8 years, 63.0 ± 11.4 kg, 1.66 ± 0.08 m [average ± standard deviation]). The spinal points were projected onto the sagittal and frontal planes of the trunk, a polynomial was fitted to the data and the two-dimensional geometric curvature was quantified. The inferior lumbar lordosis decreased compared to the orthostatic position and gait, which may favour the posterior protrusion of the lumbar spinal nucleus pulposus in people with posterior herniation. The lateral deviation at the middle of the thoracic spine increases during sirshasana, which may reflect increased difficulties for postural control and spinal loads. It could be useful for promoting positive spinal structural and functional chronic adaptations for healthy participants, if the yoga programme is carefully planned and the spinal alignment is carefully monitored during a headstand. However, it may aggravate some spinal diseases, especially scoliosis.  相似文献   

Predicting athletes’ functional and dysfunctional emotions: The role of the motivational climate and motivation regulations     

Montse C. Ruiz  Saara Haapanen  Asko Tolvanen  Claudio Robazza  Joan L. Duda 《Journal of sports sciences》2017,35(16):1598-1606

This study examined the relationships between perceptions of the motivational climate, motivation regulations, and the intensity and functionality levels of athletes’ pleasant and unpleasant emotional states. Specifically, we examined the hypothesised mediational role of motivation regulations in the climate–emotion relationship. We also tested a sequence in which emotions were assumed to be predicted by the motivational climate dimensions and then served as antecedents to variability in motivation regulations. Participants (N = 494) completed a multi-section questionnaire assessing targeted variables. Structural equation modelling (SEM) revealed that a perceived task-involving climate was a positive predictor of autonomous motivation and of the impact of functional anger, and a negative predictor of the intensity of anxiety and dysfunctional anger. Autonomous motivation was a partial mediator of perceptions of a task-involving climate and the impact of functional anger. An ego-involving climate was a positive predictor of controlled motivation, and of the intensity and impact of functional anger and the intensity of dysfunctional anger. Controlled motivation partially mediated the relationship between an ego-involving climate and the intensity of dysfunctional anger. Good fit to the data also emerged for the motivational climate, emotional states, and motivation regulations sequence. Findings provide support for the consideration of hedonic tone and functionality distinctions in the assessment of athletes’ emotional states.  相似文献   

Efficacy of an intervention to improve fluency in children with developmental dyslexia in a regular orthography   总被引：1，自引：0，他引：1  

Tressoldi PE  Vio C  Iozzino R 《Journal of learning disabilities》2007,40(3):203-209

The purpose of this study was to examine the efficacy of a method to improve reading fluency in children with dyslexia. The method, which we named "subsyllabic," was aimed at automatizing the recognition of syllables within words in connected texts, presented by ad hoc software. Two versions of this method--one self-paced and the other one with automatic syllable identification-were compared to a method based on phonemic awareness, assisted reading, and other psycholinguistic exercises. The efficacy of the two versions of the subsyllabic method was further studied by repeating the first version twice and the second version three times using an AB design, with each phase lasting approximately 3 months. This part of the study provided not only follow-up data but also useful information on if and how fluency may change after repeated treatment. Outcomes obtained by a total of 63 children with dyslexia suggested that the subsyllabic method was superior to the control method and that the use of an automatic presentation of target syllables produced better results. Furthermore, we observed that fluency improved approximately at the same rate after each treatment repetition. Our data support the possibility of improving reading fluency at a significant clinical level, at least for regular orthographies. The crucial component of the subsyllabic method seems to be the facilitation of syllable recognition within words in connected texts and the emphasis on their rapid recognition using an automatized procedure.  相似文献   

Discover: Helping teachers to discover the pleasure of learning and teaching     

Claudio Dondi  Michela Moretti 《British journal of educational technology : journal of the Council for Educational Technology》2007,38(3):519-522

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Intensity,idiosyncratic content and functional impact of performance-related emotions in athletes     

Robazza C  Bortoli L 《Journal of sports sciences》2003,21(3):171-189

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A novel Cervical Spine Protection device for reducing neck injuries in contact sports: design concepts and preliminary in vivo testing*     

Paolo Caravaggi  Alberto Leardini  Claudio Belvedere 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):382-394

Abstract

Head and neck injuries are common in contact sports such as American football. Different mechanisms can produce such injuries, including compressive impact forces on the crown of the helmet with the neck in a flexed chin-down position. The aim of this paper was developing and testing a novel Cervical Spine Protection Device (CSPD) designed to keep the neck within its safe physiological range. The cervical spine range of motion (ROM) of ten participants was measured under four conditions: free; wearing a football gear; wearing the CSPD; and wearing the CSPD underneath the gear. The CSPD was tested in terms of passive and active restraint of head motion, and for its capability to improve endurance time of the neck extensor muscles. Wearing the CSPD resulted in a significant 40–60% reduction in ROM across the three anatomical planes, and in increased endurance of the neck extensor muscles (FREE: 114 ± 57 s; CSPD: 214 ± 95 s; p = 0.004). In quasi-static loading conditions the CSPD was capable of keeping the neck within its physiological range, thus it may be used to decrease the risk of severe injuries due to dangerous chin-down positions.  相似文献   

Les graphes de flux dans l'enseignement secondaire     

Emma Castelnuovo  Daniela  Claudio Gori-Giorgi 《Educational Studies in Mathematics》1974,5(1):467-492

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On This Issue's Cover          下载免费PDF全文

Katherine Furgol Castellano 《Educational Measurement》2015,34(2):2-3

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Students' transition into higher education: The role of self-efficacy,regulation strategies,and academic achievements     

Shanyan Lin  Sofia Mastrokoukou  Claudio Longobardi  Paolo Bozzato  Francesca Giovanna Maria Gastaldi  Martina Berchiatti 《Higher Education Quarterly》2023,77(1):121-137

Transition into higher education (HE) has received increased interest in recent years, since it represents a challenging period for students. The aim of this study was to further understand the associations between self-efficacy, academic achievements, and regulation in first-year university students during their transition into HE. The convenience sample consisted of 374 first-year university students (230 females, 61.5%), aged from 18 to 33 (M = 19.86, SD = 1.51) and recruited from an Italian university. Self-efficacy was assessed using the Motivated Strategies for Learning Questionnaire; regulation strategies were assessed with the Inventory of Learning Patterns of Students; and a self-reported grade point average was taken as an indicator of each student's academic performance. Result shows that students' self-efficacy was positively associated with self-regulation and negatively associated with a lack of regulation. Students with higher self-efficacy and self-regulation strategies had better academic performance. Female students performed better in academic activities and adopted more external regulation strategies. The findings represent an opportunity for university institutions to consider the interventions they provide to first-year students in order to facilitate the successful transition from secondary school; they also provide researchers with further knowledge about the effect of self-efficacy, and regulation strategies on students' adjustment to HE.  相似文献   

On the management of open innovation     

Alfonso Gambardella  Claudio Panico 《Research Policy》2014

In an open innovation relationship, the party that owns a key asset enjoys bargaining power that discourages the investments of the other party in the collaboration. We show that these incentives can be restored by conferring on the weak party the power to take decisions during the research process – e.g., a pharmaceutical firm with manufacturing and commercialization assets offers the direction of a joint research project to a biotech partner. However, on many occasions, the strong party still captures more value from the collaboration by retaining the power to take decisions during research even if it produces less innovation value and fewer aggregate profits. We conclude that the potential of open innovation is underexploited. In particular, owners may not release enough power to take decisions on the use of their assets.  相似文献