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Abstract The aim of the present study was to determine the repeatability of a running endurance test using an automated treadmill system that requires no manual input to control running speed. On three separate occasions, 7 days apart, 10 experienced male endurance-trained runners (mean age 32 years, s = 10; [Vdot]O2peak 61 ml · kg?1 · min?1, s = 7) completed a treadmill time trial, in which they were instructed to run as far as possible in 60 min. The treadmill was instrumented with an ultrasonic feedback-controlled radar modulator that spontaneously regulated treadmill belt speed corresponding to the changing running speed of each runner. Estimated running intensity was 70%[Vdot]O2peak (s = 11) and the distance covered 13.5 km (s = 2), with no difference in mean performances between trials. The coefficient of variation, estimated using analysis of variance, with participant and trial as main effects, was 1.4%. In summary, the use of an automated treadmill system improved the repeatability of a 60-min treadmill time trial compared with time trials in which speed is controlled manually. The present protocol is a reliable method of assessing endurance performance in endurance-trained runners. 相似文献
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管流试验装置研究原油管流特性具有独到优势。对管流试验装置测量参数的不确定性进行分析,并研究了试验装置的重复性。分析表明,管流实验装置测试结果可靠,可用于测定原油的管流特性。 相似文献
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选取30名20-40岁的成年男性为受试者,在运动跑台上以75 m/min的速度持续进行10 min、10 min、15 min三个时间段的实验,用Polar表记录每5 s的心率,并按要求测试血乳酸值。结果显示:该运动是在有氧范围内进行的,并且两个10 min的运动心率积分数值十分接近;而且10 min、15 min的心率积分值与时间呈直线相关。这表明在有氧运动范围内心率积分的可重复性强,并有线性关系,在运动实践中有很强的应用价值。 相似文献
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路则权 《安庆师范学院学报(社会科学版)》2010,29(8):1-4
李则纲的《历史形态学》是他史学理论研究的重要成果。此书的思想渊源是早年师友的影响,唯物史观的发展和他个人史学实践的结果。其史学理论价值在于将历史事件从形态角度作了七种归纳,即运动性、关联性、反复性(重演性)、飞跃性(突变性)、必然性与偶然性、法则性(规律性)。 相似文献
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Due to the high incidence of lumbar spine injury in fast bowlers, international cricket organisations advocate limits on workload for bowlers under 19 years of age in training/matches. The purpose of this study was to determine whether significant changes in either fast bowling technique or movement variability could be detected throughout a 10-over bowling spell that exceeded the recommended limit. Twenty-five junior male fast bowlers bowled at competition pace while three-dimensional kinematic and kinetic data were collected for the leading leg, trunk and bowling arm. Separate analyses for the mean and within-participant standard deviation of each variable were performed using repeated measures factorial analyses of variance and computation of effect sizes. No substantial changes were observed in mean values or variability of any kinematic, kinetic or performance variables, which instead revealed a high degree of consistency in kinematic and kinetic patterns. Therefore, the suggestion that exceeding the workload limit per spell causes technique- and loading-related changes associated with lumbar injury risk is not valid and cannot be used to justify the restriction of bowling workload. For injury prevention, the focus instead should be on the long-term effect of repeated spells and on the fast bowling technique itself. 相似文献
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陈宏 《实验室研究与探索》2011,30(11)
为了掌握实验室设备的质量状况,提出了从质量管理的角度出发,把实验设备纳入测量系统的范畴,对实验教学设备进行质量评价的方法.根据测量系统的过程控制概念、MSA原理和测量系统的评价标准,分析实验设备测量系统的影响因素,建立测量模型,搜集样本和采集测量数据,运用统计软件,分析测量数据的统计特性,根据MSA的评价标准检验结果,得到实验设备测量的质量水平和持续改善实验设备测量质量的方案.通过模拟信号系统噪声测量设备的质量评价过程验证了用MSA评价实验教学设备质量水平的方法.结果表明,该方法在高校实验设备的质量评价中是一种有实用价值的方法. 相似文献