Intra-task variability of trunk coordination during a rate-controlled bipedal dance jump     

Smith JA  Siemienski A  Popovich JM  Kulig K 《Journal of sports sciences》2012,30(2):139-147

In this study, we investigated trunk coordination during rate-controlled bipedal vertical dance jumps. The aims of the study were to investigate the pattern of coordination and the magnitude of coordination variability within jump phases and relative to phase-defining events during the jump. Lumbar and thoracic kinematics were collected from seven dancers during a series of jumps at 95 beats per minute. The vector coding technique was used to quantify the pattern and variability of trunk coordination. Coordination was predominantly anti-phase during propulsion and landing. Mean coordination variability peaked just before the landing phase and at the transition from landing to propulsion phases, and was lowest during the propulsion phase just before toe-off. The results indicate that peaks in variability could be explained by task and phase-specific biomechanical demands.  相似文献   

Incidence and risk for traumatic and overuse injuries in top-level road cyclists     

De Bernardo N  Barrios C  Vera P  Laíz C  Hadala M 《Journal of sports sciences》2012,30(10):1047-1053

All traumatic and overuse injuries occurring during an average period of 4 years (2002/09) in a group of 51 currently active road top-level cyclists were retrospectively registered through clinical interviews. Average age was 25.8 years. Average training and competition period was 28.3 ± 2.4 h a week. Only 8 cyclists (15.6%) were completely free from lesions during the period of study. The remaining 43 cyclists suffered a total of 112 lesions; however, 9 out of these were unrelated to their cycling practice. These 103 cycling-related injuries include 50 (48.5%) traumatic and 53 (51.5%) overuse injuries. Twenty-eight fractures were reported, the clavicle being the most frequently affected bone (11 cases). The 68.5% of overuse injuries were located in the lower limbs. Most overuse injuries (89.6%) occurred during the training period. According to the injury abbreviated scale (AIS), severe lesions were only found in 4 cases (8% of traumatic injuries). Overall injury rates were 0.50 per racer/year, 2.02 per studied racer, and 0.007 per 1000 km of training and competition. Active professional top-level cyclists are exposed to a high injury risk. According to the scarce previously published data the current study provides relevant information on the injury occurrence of still active top-level road cycling.  相似文献   

Research and development, cash flow, agency and governance: UK large companies     

Ciaran Driver  Maria João Coelho Guedes 《Research Policy》2012,41(9):1565-1577

This paper investigates the determinants of R&D expenditure using a sample of UK listed companies with the highest spend from 2000 to 2005. We investigate the effect of corporate governance and ownership on R&D, using panel data. The results provide some evidence that more governance tends to depress R&D activity, a finding that is robust to whether a composite or disaggregated index of governance is used. One innovation of the paper is that we treat agency and finance effects interactively. The ownership stake of the CEO appears to be supportive for R&D.  相似文献   

Cinders in Snow? Indigenous Teacher Identities in Formation     

Jo‐Anne Reid  Ninetta Santoro 《Asia-Pacific Journal of Teacher Education》2006,34(2):143-160

The identity work engaged in by Indigenous teachers1 1. We use the term ‘Indigenous’ here to include Aboriginal and Torres Strait Islander people working in Australian schools, although most of our informants to date are from Victoria, NSW and Queensland, who do not use the term ‘Indigenous’ when identifying themselves and their communities, preferring ‘Aboriginal’, ‘Koori’ or ‘Murri’.. View all notes in school settings is highlighted in a study of Australian Indigenous teachers. The construction of identity in home and community relationships intersects with and can counteract the take up of a preferred identity in the workplace. In this paper we analyse data from interviews with Indigenous teachers, exploring the interplay between culture and identity. We foreground the binary nature of racial assignment in schools, demonstrate how this offers contradictory constructions of identity for Indigenous teachers, and note the effects of history, culture and location in the process of forming a teaching ‘self’.  相似文献   

Effect of Ethanol and Ultrasound Pretreatments on Pineapple Convective Drying     

Lívia Dias Campêlo de Freitas  Shirley Clyde Rupert Brando  Joo Henrique Fernandes da Silva  Otidene Rossiter S da Rocha  Patrícia Moreira Azoubel 《Food Technology and Biotechnology》2021,59(2):209

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Teacher Academy Induction Learning Community: Guiding Teachers Through Their Zone of Proximal Development     

Belinda Bustos Flores  Arcelia Hernández  Claudia Treviño García  Lorena Claeys 《Mentoring & Tutoring: Partnership in Learning》2013,21(3):365-389

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Circles and Communities,Sharing Practices and Learning: Looking at New Extension Education Approaches     

A. Cristóvão  P. Ferrão  R. Madeira  M.L. Tibério  M.J. Raínho  M.S. Teixeira 《The Journal of Agricultural Education and Extension》2013,19(2):191-203

Abstract