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101.
Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect 总被引:1,自引:1,他引:0
Castle P Mackenzie RW Maxwell N Webborn AD Watt PW 《Journal of sports sciences》2011,29(11):1125-1134
The aim of this study was to determine the effect of 10 days of heat acclimation with and without pre-cooling on intermittent sprint exercise performance in the heat. Eight males completed three intermittent cycling sprint protocols before and after 10 days of heat acclimation. Before acclimation, one sprint protocol was conducted in control conditions (21.8 ± 2.2°C, 42.8 ± 6.7% relative humidity) and two sprint protocols in hot, humid conditions (33.3 ± 0.6°C, 52.2 ± 6.8% relative humidity) in a randomized order. One hot, humid condition was preceded by 20 min of thigh pre-cooling with ice packs (-16.2 ± 4.5°C). After heat acclimation, the two hot, humid sprint protocols were repeated. Before heat acclimation, peak power output declined in the heat (P < 0.05) but pre-cooling prevented this. Ten days of heat acclimation reduced resting rectal temperature from 37.8 ± 0.3°C to 37.4 ± 0.3°C (P < 0.01). When acclimated, peak power output increased by ~2% (P < 0.05, main effect) and no reductions in individual sprint peak power output were observed. Additional pre-cooling offered no further ergogenic effect. Unacclimated athletes competing in the heat should pre-cool to prevent reductions in peak power output, but heat acclimate for an increased peak power output. 相似文献
102.
The purpose was to evaluate the traditional method, of visually focusing on the ball, in comparison to focusing on the hole, during the putting stroke. The study design consisted of a pretest, a 4-week practice period, and a posttest. Participants (n = 31, handicap: 18.7 ± 10.4) practised using only one of the two gaze techniques. Testing consisted of having all participants putt using both gaze techniques from both a 1.22 m and a 4 m distance. Five putts were executed for each gaze technique/putt length combination for a total of 20 putts in each testing session per participant. The kinematics of every putting stroke executed during testing (1240 strokes) were captured using a TOMI? system. There was a significant improvement in putting success for both groups following practice (P = 0.001). Practising while visually focusing on the hole, resulted in a statistically significant reduction in putter speed variability in comparison to practising while visually focusing on the ball (P = 0.017). Visually focusing on the hole did not meaningfully (nor statistically) affect the quality of impact as assessed by the variability in face angle, stroke path, and impact spot at the precise moment the putter head contacted the ball. 相似文献
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Cultures of Undergraduate Teaching at Research Universities 总被引:2,自引:0,他引:2
Robert C. Serow Pamela B. Van Dyk Errin M. McComb Adrian T. Harrold 《Innovative Higher Education》2002,27(1):25-37
Teaching-oriented faculty have received scant attention as a distinctive cultural force. Even among those who would speak on their behalf, undergraduate teachers have been treated as little more than a dependable workforce whose interests are best served by top-down proposals for enhanced recognition and reward. Findings from a five-campus study suggest a more complex reality. Of particular interest is an explicitly oppositional culture that questions both the Scholarship of Teaching model and the ethos of competitive achievement. These views echo the longstanding populist tradition within American higher education and represent a potential counterforce to the recent narrowing of faculty roles. 相似文献
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In his recent paper, Winch (1997) attacks a group of theories he calls cognitivism. These theories agree in holding that 'the ability to think, both consciously and subconsciously, amounts to an ability to internally manipulate symbolic representations of that which we think about (p.67).The relevance of this attack to education is that 'Cognitivism' supplies plausible-looking reasons for thinking that learning can take place without instruction, practice, memorisation or training and its prestige as a theory of learning devalues those activities within education.Its rejection should therefore lead us to re-examine our need for explicit teacher-oriented pedagogies' (p.78).Cognitivism has led to an emphasis on autonomous learning and a consequent devaluing of the role of overt teaching, 'the active transmission of knowledge and technique by an authoritative figure' (p.67). 相似文献
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Jim Mackenzie 《Journal of Philosophy of Education》2002,36(4):609-620
A comparison between two teachers drawn from fiction leads to an exploration of the issues between those whose concept of education is focused on the curriculum, and those who understand that pupils are active agents in their education and that therefore some beneficial outcomes can result from pupil subversion of the school. This is developed as a concept of an adversarial curriculum, with particular reference to moral education. 相似文献
110.