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“早春”系列以光威公司先进的设计手段和精良的加工技术为基础,最新开发的采用光威高品质碳素预浸布为主体材料制作的碳素硬调系列手竿,共有３６０６、４５０８、５４１０、６３１２和７２１３五种规格。 该系列产品在竿体的设计和制作上,整竿的竿体部分采用了９９％碳纤维增强材料,加以合理的结构设计,最大限度地发挥了碳纤维比重小、刚度高的特点,使整竿与同类型鱼竿相比具有直径更细、重量更轻、灵敏度更高和弹性更好的特点;在其最外节部分,则采用了碳纤维和玻璃纤维混合增强材料,并且采用碳素增强带螺旋缠绕补强,使碳纤维的… 相似文献
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多功能组合式壶铃的外形类似一把铁锁 ,其结构是由壶铃把手、不同长度的特制螺丝、螺帽和壶铃钢片组成。经选料 切割 钻眼 车旋 刨磨 镀镍 组合 7道工序制作而成。目前 ,我国体育器材厂家设计生产的壶铃品种规格单一 ,其重量只有 5 kg、10 kg、15 kg、2 0 kg、2 5 kg、30 kg几种规格 ,均为生铁铸造 ,表面粗糙 ,容易断裂 ,而且重量不准确 ,正负误差较大达 0 .5 kg以上 ,影响了投掷运动员专项力量训练的针对性、科学性和有效性。多功能组合式壶铃克服了上述传统壶铃的各种弊端 ,并具有以下优点 :1 重心设计合理投掷半径的长短与投掷成绩… 相似文献
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本文讲述了目前对天水公路总段危旧桥加固的一些先进方法的探索。为提高旧桥的承载能力,确保交通运输的安全,从粘贴钢板法加固、碳纤维布加固、桥面铺装层加固等方面对公路旧桥采取的一些加固措施。 相似文献
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综述已有的研究显示：运动性胃肠综合征的发病范围广,频率高,已经成为影响运动员正常训练和比赛的一个较为突出的问题．本文从胃肠的化学屏障,免疫学屏障和生物学屏障上对其进行全面的研究,结合中国传统中医药理论,从多个方面了解运动性胃肠综合征发生的原因、影响因素及其可能的机制,为早日认清和治疗运动性胃肠综合征奠定一定的理论基础． 相似文献
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河北省环京津环渤海区位优势得不到充分发挥的关键在于产业的重化工化,而重化工产业布局需要远离中心城市;实现京津冀协同发展需要沿京津周围布局轻工业产业带作为过渡,以实现河北重化工业和京津城市产业的密切衔接;但是目前河北轻工业发展滞后,需要通过促进加工贸易以外部力量来提升轻工业的产业水平和发展速度。 相似文献
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This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue. 相似文献
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Roy J. Shephard 《Journal of sports sciences》2013,31(7):603-620
The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae. 相似文献
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重新认识体育的社会关联 总被引：3，自引：1，他引：2
体育与政治之间存在一个悖论，体育的发展与经济实力之间没有直线相关，体育与教育部分重叠，体育与宗教最为近缘，体育可借用科学手段，体育的艺术禀性日益明显，体育与养生反映着两种人生观。 相似文献
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本文在专家访谈、问卷调查、数理统计和文献资料分析的基础上,探析了上海社区体育竞赛参与者的特点、参与者对社区体育赛事运作管理的看法等问题。在此基础上从引进社区体育赛事的志愿者、整合社区体育赛事的各种资源、开发社区体育竞赛的无形资产、组建非营利性的专业团队、规范社区体育赛事的服务管理等方面提出了进一步满足上海社区居民日益增长的体育竞赛参赛需求的对策与措施。 相似文献
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对全面把握游泳训练环节的探讨 总被引：4，自引：0，他引：4
从系统观点出发,结合训练实践,对全面把握游泳训练环节进行探讨。认为应强化非智力因素在运动员多年训练中的作用,在育材全过程中不断选材,从整体上把握动态训练的全过程,把培养高水平运动员的整个过程置于一个严格的科学控制之下。 相似文献