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The effects of changing pace on metabolism and stroke characteristics during high-speed breaststroke swimming 总被引:1,自引:0,他引:1
Performances often vary between the heats and finals of breaststroke swimming competitions possibly because the swimmers try to conserve their energy, or for other tactical reasons. Additionally, coaches might advise either a 'positive' or 'even' pace race strategy during the final. The effect of such pacing changes on metabolism (blood lactate, heart rate, ventilation), ratings of perceived exertion, stroke kinematics and turning times have not been investigated. Nine male competitive breaststroke swimmers swam three paced (Aquapacer) 200-m trials, 48 h apart and in random order, at 98%, 100% and at an attempted 102% of their maximal 200-m time-trial speed. Responses in metabolic variables were similar between the 98% and 100% trials, but higher post-exercise blood lactate concentrations and respiratory exchange ratios were observed following the 102% trial. As the pace of trials increased, stroke rate was found to increase proportionately with stroke count. However, during the latter stages of the 100% trial, a disproportionate increase in the stroke count was observed, which led to a significant pacing error. This feature was more obvious in the 102% trial, where participants demonstrated 'positive pacing' and reported higher ratings of perceived exertion than for the 98% trial. During the early stages of the trials, turning times were initially shorter the faster the pace of the trial; however, as the trials progressed, this pattern was found to reverse. We conclude that a slight reduction in pace during near maximal breaststroke swimming altered kinematic but not post-exercise metabolic responses, while an increase in pace led to positive pacing and an increase in both kinematic responses and anaerobic metabolism. 相似文献
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Seventeen healthy adults exercised for 30 min (70% VO2max), at different times of the day and night throughout a 24 h period. The effect on the phase of core temperature rhythm was assessed by comparing the rhythms on the day immediately before and immediately after the day of exercise with the participants living normally on these 2 days. Assessments were made upon data that had been corrected for the thermogenic effects of sleep and activity. When exercise was performed in the period between 4 h before and 1 h after the temperature minimum, there was a phase delay of 1.03 +/- 0.78 h (mean +/- s; n = 6); when performed between 3 and 8 h after the temperature minimum, there was a phase advance of 1.07 +/- 1.23 h (n = 9). Both means were significantly different from zero (Student's one-sample t-tests: P < 0.05). Performed at other times, exercise had no significant effect on the phase of the temperature rhythm. The phase changes were not significantly different from those previously observed by us in sedentary individuals exposed to domestic lighting. We conclude that the amount of physical activity has very little effect on the body clock. 相似文献
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Jonathan M. D. Staynor Joanna C. Nicholas Gillian Weir Jacqueline A. Alderson 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(4):501-513
This study aims to determine if biomechanically informed injury prevention training can reduce associated factors of anterior cruciate ligament injury risk among a general female athletic population. Female community-level team sport athletes, split into intervention (n = 8) and comparison groups (n = 10), completed a sidestepping movement assessment prior to and following a 9-week training period, in which kinetic, kinematic and neuromuscular data were collected. The intervention group completed a biomechanically informed training protocol, consisting of plyometric, resistance and balance exercises, adjunct to normal training, for 15–20 min twice a week. Following the 9-week intervention, total activation of the muscles crossing the knee (n = 7) decreased for both the training (? ?15.02%, d = 0.45) and comparison (? ?9.68%, d = 0.47) groups. This decrease was accompanied by elevated peak knee valgus (? +27.78%, d = ?0.36) and internal rotation moments (? +37.50%, d = ?0.56) in the comparison group, suggesting that female community athletes are at an increased risk of injury after a season of play. Peak knee valgus and internal rotation knee moments among athletes who participated in training intervention did not change over the intervention period. Results suggest participation in a biomechanically informed training intervention may mitigate the apparent deleterious effects of community-level sport participation. 相似文献
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Using Necessary Information to Identify Item Dependence in Passage-Based Reading Comprehension Tests
Applications of traditional unidimensional item response theory models to passage-based reading comprehension assessment data have been criticized based on potential violations of local independence. However, simple rules for determining dependency, such as including all items associated with a particular passage, may overestimate the dependency that actually exists among the items. The current study proposed a more refined method based on cognitive principles and substantive theories to determine those items that pose a threat. Specifically, the use of common necessary information from text was examined as a contributor of local dependence. Cognitively similar item pairs, those with connected necessary information, had higher local dependence values than item pairs with no connected necessary information. Results suggest that focusing on necessary information may be useful to some extent for understanding and managing item dependence for passage-based reading comprehension tests. 相似文献
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不同国家依据市场准则对高等教育进行调整,这些调整导致了新的社会阶层——学生消费者的产生,从而影响了高等教育的性质、目的和价值观。政府支持学生消费者权利的重要尝试体现在高校与学生的合约中,这些合约规定了学生期望获得服务的水平以及他们为之应尽的义务。作者运用布迪厄的理论框架分析了高校的组织特征和运作机制,关注其对学生学习过程和教师学术行为的影响。高校为提高市场运作而提供了很多生产和服务信息,通过研究这些信息,作者发现高校常常营造一种特殊形象向即将升学的学生进行宣传,这种形象同时也调整着在校生的预期。这说明信息并非中立,而往往能构建起学生体验的独特概念,影响着学生的身份并强化了学生作为消费者的地位。就此而言,我们认为在变革了的社会经济政治环境中,高等教育作为公共产品与私人产品的平衡被重建了。在学术与政策层面,对消费主义的关注为大学注入了外在驱动的实用主义目标,从而强化了当前将高等教育看作私人投资的观念。 相似文献