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Tipton KD Jeukendrup AE Hespel P;International Association of Athletics Federations 《Journal of sports sciences》2007,25(Z1):S5-15
The primary roles for nutrition in sprints are for recovery from training and competition and influencing training adaptations. Sprint success is determined largely by the power-to-mass ratio, so sprinters aim to increase muscle mass and power. However, extra mass that does not increase power may be detrimental. Energy and protein intake are important for increasing muscle mass. If energy balance is maintained, increased mass and strength are possible on a wide range of protein intakes, so energy intake is crucial. Most sprinters likely consume ample protein. The quantity of energy and protein intake necessary for optimal training adaptations depends on the individual athlete and training demands; specific recommendations for all sprinters are, at best, useless, and are potentially harmful. However, if carbohydrate and fat intake are sufficient to maintain energy levels, then increased protein intake is unlikely to be detrimental. The type and timing of protein intake and nutrients ingested concurrently must be considered when designing optimal nutritional strategies for increasing muscle mass and power. On race day, athletes should avoid foods that result in gastrointestinal discomfort, dehydration or sluggishness. Several supplements potentially influence sprint training or performance. Beta-alanine and bicarbonate may be useful as buffering agents in longer sprints. Creatine may be efficacious for increasing muscle mass and strength and perhaps increasing intensity of repeat sprint performance during training. 相似文献
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Marie Fulková Teresa M. Tipton 《The International Journal of Art & Design Education》2013,32(1):83-96
When A Genomic Portrait – Sir John Sulston by Mark Quinn appeared in the London National Portrait Gallery's exhibition in 2001/2, the ensuing public controversy over its portrayal raised a number of questions about the representation of a publicly known figure. Because the portrait was the Gallery's first contemporary commission using specialised, scientific procedures in its creation, a number of issues arose surrounding its authenticity. How questions of authenticity are answered depends upon how the viewer reads aspects of scientific coding as it functions within the artistic domain. This is a form of visual literacy that depends on the viewer's ability to lift the veil that operates between coding systems and the context of their use. Literacy in this case is built upon the relationship between visual interpretation and ascribed systems of meaning within the context of their recontextualisations. By playing with the intersections between artistic and scientific discourses, the authors investigate how the representation of identity functions as a polysemy across different semiotic domains. Using visual semiotics to examine the intersections between sign systems across these domains, some of the communication aspects of how new modes of art function in present‐day communities are provoked. By illustrating the complexity of this process as a part of transforming expert knowing into pedagogical practice, support is given for improving teacher education in the arts and cultural domain. 相似文献
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Joseph A. Taylor Kathleen Roth Christopher D. Wilson Molly A. M. Stuhlsatz Elizabeth Tipton 《Journal of research on educational effectiveness》2017,10(2):241-271
This article describes the effects of an analysis-of-practice professional development (PD) program on elementary school students' (Grades 4–6) science outcomes. The study design was a cluster-randomized trial with an analysis sample of 77 schools, 144 teachers and 2,823 students. Forty-two schools were randomly assigned to treatment, (88.5 hours) of integrated analysis-of-practice and content deepening PD (over the course of one year) while 35 schools were randomly assigned to receive an equal number of PD hours in science content deepening alone. Students' content knowledge, as measured by a project-specific test, was compared across treatment groups. The effect size for this comparison was 0.52 standard deviations in favor of students whose teachers participated in the PD that included analysis-of-practice. This effect compares favorably to that of other elementary school interventions whose effectiveness was studied with a narrowly focused outcome measure. Analysis of the demographics of the study schools suggests that the treatment effect could be relevant outside the local study context. Implications for future research include tests of mediation for teacher-level outcomes and efficacy tests of specific teaching strategies (intervention subcomponents). 相似文献
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Courses: Communication Theory, Organizational Communication, Strategic Communication.
Objectives: Students will identify and categorize organizational discourses on their campuses; students will become aware of the ethical considerations of communication; students will recognize the different perceptions of organizational culture on campus. 相似文献
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Protein and amino acids for athletes 总被引：5，自引：0，他引：5
The main determinants of an athlete's protein needs are their training regime and habitual nutrient intake. Most athletes ingest sufficient protein in their habitual diet. Additional protein will confer only a minimal, albeit arguably important, additional advantage. Given sufficient energy intake, lean body mass can be maintained within a wide range of protein intakes. Since there is limited evidence for harmful effects of a high protein intake and there is a metabolic rationale for the efficacy of an increase in protein, if muscle hypertrophy is the goal, a higher protein intake within the context of an athlete's overall dietary requirements may be beneficial. However, there are few convincing outcome data to indicate that the ingestion of a high amount of protein (2-3 g x kg(-1) BW x day(-1), where BW = body weight) is necessary. Current literature suggests that it may be too simplistic to rely on recommendations of a particular amount of protein per day. Acute studies suggest that for any given amount of protein, the metabolic response is dependent on other factors, including the timing of ingestion in relation to exercise and/or other nutrients, the composition of ingested amino acids and the type of protein. 相似文献
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Scott K. Powers Stephen Dodd Richard Deason Ronald Byrd Tipton Mcknight 《Research quarterly for exercise and sport》2013,84(2):179-182
Abstract The purpose of this study was to assess the relationships among ventilatory threshold T(vent), running economy and distance running performance in a group (N=9) of trained experienced male runners with comparable maximum oxygen uptake ([Vdot]O2 max). Maximal oxygen uptake and submaximal steady state oxygen uptake were measured using open circuit spirometry during treadmill exercise. Ventilatory threshold was determined during graded treadmill exercise using non-invasive techniques, while distance running performance was assessed by the best finish time in two 10-kilometer (km) road races. The subjects averaged 33.8 minutes on the 10km runs, 68.6 ml · kg -1 · min -1 for [Vdot]O2 max, and 48.1 ml · kg -1 · min -1 for steady state [Vdot]O2 running at 243 meters · min -1. The T(vent) (first deviation from linearity of [Vdot]E, [Vdot]CO 2 ) occurred at an oxygen consumption of 41.9 ml · kg -1 · min -1. The relationship between running economy and performance was r = .51 (p>0.15) and the relationship between T(vent) and performance was r = .94 (p < 0.001). Applying stepwise multiple linear regression, the multiple R did not increase significantly with the addition of variables to the T(vent); however, the combination of [Vdot]O2 max, running economy and T(vent) was determined to account for the greatest amount of total variance (89%). These data suggest that among trained and experienced runners with similar [Vdot]O2 max, T(vent) can account for a large portion of the variance in performance during a 10km race. 相似文献
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