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《European Journal of Sport Science》2013,13(1):13-20
Abstract Rock climbing is a popular adventure sport with an increasing research base. Early studies in the field did not make comparisons of ascents using different styles of climbing. More recently, differences in the physiological responses for an on-sight lead climb and subsequent lead climb have been reported. The purpose of the present study was to examine the effect of style of climb (lead climb or top rope climb) on the physiological and psychological responses to rock climbing. Nine intermediate climbers volunteered for, and completed, two randomly assigned climbing trials and a maximum oxygen uptake (VO2max) test on a separate occasion. The climbers ascended the same 6a (sport grade) climb for both trials. Before climbing, heart rate, perception of anxiety (Revised Competitive State Anxiety Inventory-2), and blood lactate concentration were measured. Climb time, heart rate, VO2, lactate concentrations, and task load (National Aeronautics and Space Administration Task Load Index) in response to each trial were also recorded. Results indicated significant differences (P<0.05) between the trials for climb time, blood lactate concentration immediately after and 15 min after climbing, and heart rate 1 min after climbing. During lead and top rope climbing, mean VO2 and represented 44% and 42% of treadmill VO2max and mean heart rate represented 81% and 77% of maximum heart rate, respectively. There were no significant differences in feelings of anxiety before either climb, although climbers reported the lead climb to be physically and mentally more demanding, requiring more effort and resulting in greater frustration (P<0.05) than the top rope climb. Our results indicate that the physiological and psychological responses of intermediate climbers are different for a lead climb and top rope climb. 相似文献
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李文 《辽宁科技学院学报》2021,23(1):14-16,47
电梯是现代高层建筑必不可少的组成部分,而作为电梯最重要的零部件,曳引钢丝绳在使用过程中经常会出现断丝,断股和油污过重等情况,如不及时处理,容易引发各种电梯的安全事故,造成较大的人员和财产损伤。传统的检测方法往往不能及时地发现曳引钢丝绳的缺陷,文章通过集成了微处理器、A/D、I/O、存储器、图像处理软件、模式识别软件的机器视觉检测系统来对电梯曳引钢丝绳进行检测,能够有效地避免这一问题,提高工作效率和存在问题的检测率,从而有效地预防电梯事故的发生。 相似文献
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11世纪随着西欧社会生产力的发展和经济的复苏,城市开始复兴建立。但西欧中世纪城市兴建于教俗封建主的领地上,封建主为了自身政治、经济、军事的需要支持参与了城市的兴建活动。对城市的产生发展起了积极的促进作用。 相似文献
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临潭"万人扯绳"活动已经存在了六百余年,最早是以军中游戏的形式出现的,后来群众把扯绳运动作为占卜收成的象征。本文不仅探讨了临潭万人扯绳悠久的拔河传统,同时对灿烂的拔河文化、丰富的拔河内涵以及对当地经济文化传承、发展等作了分析。 相似文献
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为了选择适合大众锻炼的跳绳评价指标,规范跳绳技术内容,建立跳绳大众锻炼等级标准。采用资料分析法、专家访谈法、问卷调查法、教育测试法、录像分析法进行研究,得出结论:1)确定跳绳大众锻炼等级评价标准的测评内容为1 min单人绳跳及3 min10人长绳"8"字跳、基本动作类指标和难度动作类指标。2)确定跳绳大众锻炼标准等级评价体系,主要分为三段九级,建立逐级递进的等级评价标准模式:达标部分通过离差法确定各个等级的评价标准,技评部分通过完成基本动作和难度动作数量来确定各个等级评价标准。3)对数据来源的可靠性以及男女之间差异进行了分析,最终确定各个测评内容1-9级的分级标准。 相似文献
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分析(10+10)t电磁吊钢丝绳卷筒故障原因,介绍对传动轴、钢丝绳卷筒轴、卷筒毂等进行的设计与改造。 相似文献