Sporer B C, McKenzie D C
Department of Human Kinetics, University of British Columbia, Vancouver, Canada.
Int J Sports Med. 2007 Nov;28(11):940-4. doi: 10.1055/s-2007-964977. Epub 2007 May 11.
The purpose of this study was to evaluate the reliability of a 20-km cycling time trial using the Velotron cycle ergometer in competitive cyclists. Twenty male cyclists (V.O (2max) = 68.5 +/- 3.6 ml . kg (-1) . min (-1); peak power (P (peak)) = 469 +/- 33 W) participated in this study. Each subject performed a V.O (2max) test and 3 separate 20-km time trials (TT1, TT2, and TT3). Data from trials were compared using a one-way ANOVA. Coefficients of variation (CV) and 95 % confidence intervals (CI) were calculated between trials. Values are mean +/- SD unless otherwise noted. Performance time T (tot) (30.03 +/- 1.24, 30.12 +/- 1.21, and 30.14 +/- 1.21 min) and mean absolute power (P (mean)) (326 +/- 35, 323 +/- 35, 322 +/- 34 Watts) were not significantly different across TT1 - TT3. P (mean) was highly related between TT1 - TT2 (r = 0.96; p < 0.01) and TT2 - TT3 (r = 0.97; p < 0.01). A low CV was also demonstrated between trials for P (mean) (TT1 - TT2 = 2.1 %, CI = 1.6 % to 3.1 %; TT2 - TT3 = 1.9 %, CI = 1.4 % to 2.8 %). P (peak) and P (mean) were both correlated to T (tot) in TT1 with P (mean) accounting for most of the variance in T (tot) (R (2) = 0.993). These data show that performance in a 20-km time trial using the Velotron ergometer is highly reproducible in competitive cyclists. Furthermore, the CV variance demonstrated between trials is comparable to that expected during actual performance in elite athletes.
本研究的目的是评估使用Velotron自行车测力计对竞技自行车运动员进行20公里骑行计时赛的可靠性。20名男性自行车运动员（最大摄氧量（V.O₂max）= 68.5±3.6毫升·千克⁻¹·分钟⁻¹；峰值功率（P(peak)）= 469±33瓦）参与了本研究。每位受试者进行了一次最大摄氧量测试和3次独立的20公里计时赛（TT1、TT2和TT3）。使用单因素方差分析对各次测试的数据进行比较。计算各次测试之间的变异系数（CV）和95%置信区间（CI）。除非另有说明，数值均为平均值±标准差。计时赛总用时T(tot)（30.03±1.24、30.12±1.21和30.14±1.21分钟）和平均绝对功率（P(mean)）（326±35、323±35、322±34瓦）在TT1 - TT3之间无显著差异。TT1 - TT2之间（r = 0.96；p < 0.01）以及TT2 - TT3之间（r = 0.97；p < 0.01）的P(mean)高度相关。各次测试之间P(mean)的CV也较低（TT1 - TT2 = 2.1%，CI = 1.6%至3.1%；TT2 - TT3 = 1.9%，CI = 1.4%至2.8%）。在TT1中，P(peak)和P(mean)均与T(tot)相关，其中P(mean)占T(tot)大部分方差（R² = 0.993）。这些数据表明，使用Velotron测力计进行20公里计时赛的成绩在竞技自行车运动员中具有高度可重复性。此外，各次测试之间显示出的CV方差与精英运动员实际比赛期间预期的方差相当。
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