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The physiological demands of cross-country skiing require competitive skiers to have high maximal oxygen uptakes and anaerobic thresholds. Anaerobic capacity has a relatively less important role, but may be of greater importance today with the faster race velocities resulting from the new skiing techniques of ski skating. Although use of the ski skating techniques results in faster race velocities than the classical techniques, it has been found that under some conditions the double-pole technique is more economical than other skiing techniques. It is suggested that this results from a more effective storage and recovery of elastic energy, a greater proportion of the forces being directed along the line of travel, and a lower air resistance due to greater trunk and hip flexion with the double-pole technique. The greater economy of the double-pole technique suggests that this may be advantageous in certain race conditions if the upper body is adequately prepared. The greater propulsive forces generated with the upper body with ski skating also suggest that training of the upper body should receive more emphasis. The potential cardiovascular adaptations from cross-country ski training appear to be similar for the classical and skating techniques, yet training specificity is important for optimal performance. 相似文献
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This study examines frequency, overlap, and genetic and environmental influences on sleep difficulties, which are understudied in school-aged children. The Sleep Self Report and the Children's Sleep Habits Questionnaire were completed by 300 twin pairs (aged 8 years) and their parents. Child report suggested more frequent sleep problems than parent report (e.g., regular sleep onset delay was reported by 45% of children and 17% of parents). Associations between most of the sleep difficulties were small but significant (e.g., r(s)=.16 for parent report of bedtime resistance and sleep onset delay). Twin correlations based on parent reports suggest greater genetic influence (M=50%) than those based on child self-report (M=18%). Possible rater effects should be considered when evaluating children's sleep problems. 相似文献
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Kathryn Lovering Ian Frampton Ben Crowe Alice Moseley Moira Broadhead 《Emotional and Behavioural Difficulties》2013,18(2):83-104
Scallywags is a community‐based, early intervention programme for young children (aged 3–7) with behavioural, emotional and social problems, which integrates work in the home and school with a parenting curriculum and direct work with children. A pre‐post intervention study across multi‐sites of 340 participants is reported. Using standardised measures, the study found statistically significant reductions in problems at home and school experienced by children who completed the programme, and in parental stress levels. Participation was found to be high and the project acceptable to parents, many of whom would be described as hard to reach. The rigorous evaluation of this real‐life service and its positive outcomes highlight the potential of such programmes to tackle the needs of these children and families, and help prevent longer‐term problems associated with early onset behavioural problems, including social exclusion, antisocial behaviour and educational failure. 相似文献
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Mary Alice Garber 《Emotional and Behavioural Difficulties》2013,18(1):41-50
The Alexandria Virginia Office of the Sheriff and the Alexandria Virginia Public School Board participated for two years in a state funded grant which focused on the delivery of special education services and regular compulsory education services to juveniles and young adults through the age of 21 years who were committed to the Alexandra Adult Detention Center. Provision of special education services to eligible individuals in jails is a unique concept and rarely provided given the transient, short-term nature of the population and other demands of the setting. The program model of team teaching supported full time inclusion of special education students with the general and compulsory education programs in the jail. 相似文献
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Alice van Ommeren Catharine Liddicoat Willard Hom 《Community College Journal of Research & Practice》2013,37(7):463-479
The economic, educational and social environments of the students served by a community college are important factors in college performance accountability, policy analysis, program evaluation, and strategic planning. For example, previous research shows that income per county is a significant predictor of transfer rates for community colleges. However, conditions for the actual geographic area of the students served by a community college may differ, for various reasons, from the economic conditions for the county in which the college is located. This article describes the development of institutional or college-level indices as an enhancement to county-level data, their use as adjustment variables for California's Accountability Reporting for the Community Colleges (ARCC), and their applicability to other research and planning studies. The service area indices are created by combining the enrollment patterns of students by ZIP Code of residence with ZCTA (ZIP Code Tabulation Area) level economic and educational data from Census 2000. 相似文献
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Parisa Soltani Rebecca Gutierrez Keeton John L. Hoffman 《Community College Journal of Research & Practice》2013,37(7):405-421
ABSTRACTThe purpose of this mixed methods study was to investigate the relationship between participation in Extended Opportunity Programs and Services (EOPS) at California Valley College (CVC) (one of the 113 California Community Colleges in California) and several measures of student learning. An embedded survey design was developed using William Sedlacek’s noncognitive questionnaire (NCQ), items from the Community College Survey of Student Engagement (CCSSE), items based on Marcia Baxter Magolda’s epistemological reflection model of cognitive complexity, and items based on student learning outcomes for learning in EOPS. The survey had a 43.7% response rate. Students’ demographic characteristics, progress data, and grades were also collected. The survey concluded with four open-ended questions examining students’ perceptions about their learning. GPA (grade point average) as an outcome measure, and several NCQ scales were positively correlated with the Learning in EOPS Scale. Qualitative and mixed methods analyses extended statistical findings, highlighting the importance of positive outlook, positive self-concept, realistic self-appraisal, and support for learning. Finally, the study found that students’ academic and social involvement played a noteworthy role in students’ development, especially as related to cognitive complexity and learning in EOPS. 相似文献
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The eight early childhood educators who participated in this study were admitted into a 60-credit statewide distance-delivered Associate of Applied Science (AAS) degree program at the University of Alaska. All eight educators were women of Alaska Native ancestry who lived and worked in remote and rural Native communities. Seven of these teachers were employed by Head Start programs and one taught preschool for a rural school district. A major goal of the statewide distance-delivered AAS program is that participants will become skilled observers of children and learn to use observation to make decisions that foster developmentally appropriate and culturally responsive services. All the course work in our AAS degree program involves actively doing and using observations of children. This study is based on a principle that intrinsic changes can occur in program management, curriculum development, and teacher practice when teachers learn how to use observation of children rather than external evaluation to make decisions about their programs. 相似文献