Schabort E J, Hopkins W G, Hawley J A
MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, South Africa.
Int J Sports Med. 1998 Jan;19(1):48-51. doi: 10.1055/s-2007-971879.
The reproducibility of performance in a laboratory test impacts on the statistical power of that test to detect changes of performance in experiments. The purpose of this study was to determine the reproducibility of performance of distance runners completing a 60 min time trial (TT) on a motor-driven treadmill. Eight trained distance runners (age 27 +/- 7yrs, peak oxygen consumption [VO2peak] 66 +/- 5 ml x min(-1) x kg(-1), mean +/- SD) performed the TT on three occasions separated by 7-10 days. Throughout each TT the runners controlled the speed of the treadmill and could view current speed and elapsed time, but they did not know the elapsed or final distance. On the basis of heart-rate, it is estimated that the subjects ran at an average intensity equivalent to 80-83% of VO2peak. The distance run in 1 h did not vary substantially between trials (16.2 +/- 1.4 km, 15.9 +/- 1.4 km, and 16.1 +/- 1.2 km for TTs 1-3 respectively, p = 0.5). The coefficient of variation (CV) for individual runners was 2.7% (95% Cl = 1.8-4.0%) and the test-retest reliability expressed as an intraclass correlation coefficient was 0.90 (95% Cl = 0.72-0.98). Reproducibility of performance in this test was therefore acceptable. However, higher reproducibility is required for experimental studies aimed at detecting the smallest worthwhile changes in performance with realistic sample sizes.
实验室测试中表现的可重复性会影响该测试在实验中检测表现变化的统计效力。本研究的目的是确定长跑运动员在电动跑步机上完成60分钟计时赛（TT）时表现的可重复性。八名训练有素的长跑运动员（年龄27±7岁，峰值耗氧量[VO2peak]66±5 ml·min⁻¹·kg⁻¹，平均值±标准差）在三次间隔7 - 10天的情况下进行了计时赛。在每次计时赛过程中，运动员控制跑步机的速度，并能查看当前速度和已用时间，但他们不知道已跑过的或最终的距离。根据心率估计，受试者以相当于VO2peak的80 - 83%的平均强度跑步。三次试验中1小时内跑的距离变化不大（计时赛1 - 3分别为16.2±1.4 km、15.9±1.4 km和16.1±1.2 km，p = 0.5）。个体运动员的变异系数（CV）为2.7%（95%可信区间 = 1.8 - 4.0%），以组内相关系数表示的重测信度为0.90（95%可信区间 = 0.72 - 0.98）。因此，该测试中表现的可重复性是可以接受的。然而，对于旨在用实际样本量检测表现中最小有价值变化的实验研究来说，需要更高的可重复性。
