Schabort E J, Hawley J A, Hopkins W G, Mujika I, Noakes T D
Department of Physiology, University of Cape Town Medical School, South Africa.
Med Sci Sports Exerc. 1998 Dec;30(12):1744-50. doi: 10.1097/00005768-199812000-00014.
The purpose of this study was to devise and evaluate a laboratory test of cycling performance that simulates the variable power demands of competitive road racing. The test is a 100-km time trial interspersed with four 1-km and four 4-km sprints.
On three occasions separated by 5-7 d, eight endurance-trained cyclists (peak oxygen uptake 5.0 +/- 0.7 L.min-1, peak power output 411 +/- 43 W, mean +/- SD) performed the test on their own bikes mounted on an air-braked Kingcycle ergometer. Subjects were free to regulate their power output but were asked to complete each sprint and the full distance as quickly as possible. The only feedback given to the cyclists during each test was elapsed distance.
In the first test, time for the 100 km and mean times for the 1-km and 4-km sprints were 151:42 +/- 10:36, 1:16 +/- 0:06, and 5:31 +/- 0:16 min:s, respectively; these times improved by 1.6-2.2% in the second test, but there was little further improvement in the third test (0.7 to -0.5%). The between-test correlation for 100-km time was 0.93 (95% CI 0.79 to 0.98), and the within-cyclist coefficient of variation was 1.7% (95% CI 1.1 to 2.5%). Mean sprint performance showed similar good reliability (within-subject variation and correlations for the 1-km and 4-km sprint times of 1.9%, 2.0%, 0.93, and 0.81, respectively).
The high reliability of this laboratory test will make the test useful for research on performance of competitive road cyclists.
本研究的目的是设计并评估一种模拟公路自行车赛中可变功率需求的骑行性能实验室测试。该测试为100公里计时赛，其间穿插四个1公里和四个4公里的冲刺赛段。
八名耐力训练有素的自行车运动员（峰值摄氧量5.0±0.7升·分钟-1，峰值功率输出411±43瓦，均值±标准差）在间隔5 - 7天的三个时间段，在安装有空气制动的Kingcycle测力计的自己的自行车上进行该测试。受试者可自由调节功率输出，但要求尽快完成每个冲刺赛段和全程。每次测试期间给自行车运动员的唯一反馈是已骑行的距离。
在第一次测试中，100公里用时以及1公里和4公里冲刺赛段的平均用时分别为151:42±10:36、1:16±0:06和5:31±0:16分钟:秒；在第二次测试中这些时间提高了1.6 - 2.2%，但在第三次测试中几乎没有进一步改善（0.7%至−0.5%）。100公里用时的测试间相关性为0.93（95%置信区间0.79至0.98），骑行者内变异系数为1.7%（95%置信区间1.1至2.5%）。平均冲刺表现显示出类似的良好可靠性（1公里和4公里冲刺用时的受试者内变异和相关性分别为1.9%、2.0%、0.93和0.81）。
该实验室测试的高可靠性将使其对公路自行车赛运动员的性能研究有用。
