a Centre for Sport Science and University Sports , University of Vienna , Vienna , Austria.
b Department of Exercise and Sport Science, Exercise and Sports , LUNEX International University of Health , Differdingen , Luxemburg.
Eur J Sport Sci. 2018 Apr;18(3):332-340. doi: 10.1080/17461391.2017.1418025. Epub 2018 Jan 15.
The aim of the study was to determine whether estimates of the speed-duration relationship are affected using different time-trial (TT) field-based testing protocols, where exhaustive times were located within the generally recommended durations of 2-15 min. Ten triathletes (mean ± SD age: 31.0 ± 5.7 years; height: 1.81 ± 0.05 m; body mass: 76.5 ± 6.8 kg) performed two randomly assigned field tests to determine critical speed (CS) and the total distance covered above CS (D́). CS and D́ were obtained using two different protocols comprising three TT that were interspersed by 60 min passive rest. The TTs were 12, 7, and 3 min in Protocol I and 10, 5, and 2 min in Protocol II. A linear relationship of speed vs. the inverse of time (s = D́ × 1/t + CS) was used to determine parameter estimates. Significant differences were found for CS (p = 0.026), but not for D́ (p = 0.123). The effect size for CS (d = 0.305) was considered small, while that for D́ was considered moderate (d = 0.742). CS was significantly correlated between protocols (r = 0.934; p < 0.001), however, no correlation was found for D́ (r = 0.053; p = 0.884). The 95% limits of agreement were ±0.28m s and ±73.9 m for CS and D́, respectively. These findings demonstrate that the choice of exhaustive times within commonly accepted durations results in different estimates of CS and D́, and thus protocols cannot be used interchangeably. The use of a consistent protocol is therefore recommended, when investigating or monitoring the speed-duration relationship estimates in well-trained athletes.
本研究旨在确定使用不同的计时赛（TT）场测协议是否会影响速度-时间关系的估算，其中全力骑行时间位于通常建议的 2-15 分钟的范围内。10 名三项全能运动员（平均年龄±标准差：31.0±5.7 岁；身高：1.81±0.05 米；体重：76.5±6.8 千克）进行了两次随机分配的场测，以确定临界速度（CS）和 CS 以上的总骑行距离（D'）。CS 和 D'使用两种不同的协议获得，该协议包含三个 TT，TT 之间间隔 60 分钟的被动休息。TT 在协议 I 中分别为 12、7 和 3 分钟，在协议 II 中分别为 10、5 和 2 分钟。速度与时间的倒数（s=D'×1/t+CS）的线性关系用于确定参数估计值。CS 存在显著差异（p=0.026），但 D'无差异（p=0.123）。CS 的效应量（d=0.305）被认为较小，而 D'的效应量被认为较大（d=0.742）。CS 在协议之间呈显著相关（r=0.934；p<0.001），但 D'无相关性（r=0.053；p=0.884）。CS 和 D'的 95%一致性界限分别为±0.28m/s 和±73.9m。这些发现表明，在通常接受的时间范围内选择全力骑行时间会导致 CS 和 D'的估计值不同，因此协议不能互换使用。因此，当在训练有素的运动员中研究或监测速度-时间关系的估计值时，建议使用一致的协议。
