Reliability of the 15-s Maximal Lactate Accumulation Rate (VLamax) Test for Cycling

Christopher R. Harnish, Thomas C. Swensen, Deborah King
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Abstract

Background: The purpose of this study is to ascertain the reliability of two 15-s sprint cycling tests in men and women to estimate the maximum lactate accumulation rate (VLamax). Methods: Eighteen men and twelve women completed two sprint sessions over 1 week. A 10 min warm-up preceded the obtaining of a 3 µL blood lactate (BLC) sample, after which a 15 s sprint was completed; cyclists then rested passively while multiple lactate samples were taken until the levels peaked. Trial differences and reliability across trials were analyzed using a paired-sample t-test, Pearson’s correlation, Intraclass correlation (ICC), and Bland–Altman analysis with α = 0.05 for all tests; data are reported as mean ± sd. Results: Power (W) was similar across trials (773.0 ± 143.5 vs. 758.2 ± 127.4; p = 0.333) and the coefficient of variation (CV) of 4.7%. VLamax (mM·L−1·s−1) was similar (0.673 ± 0.024 vs. 0.635 ± 0.237; p = 0.280), but only moderately reliable across trials with CV, ICC, and R values of 18.6%, 0.661, and 0.67, respectively. Pre-BLC and peak BLC CV were 45.6 and 23.3%, respectively. Conclusions: A 15 s VLamax cycling sprint is moderately reliable, possibly affected both by the lactate measurement and other variables used in the calculation. More research may offer ways to improve reliability.
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15-s最大乳酸积累率(VLamax)试验的可靠性
背景:本研究的目的是确定两个15秒冲刺自行车测试在男性和女性估计最大乳酸积累率(VLamax)的可靠性。方法:18名男性和12名女性在一周内完成了两次冲刺。在获得3µL血乳酸(BLC)样本前进行10分钟热身,然后进行15 s冲刺;然后骑车者被动休息,同时采集多个乳酸样本,直到乳酸水平达到峰值。采用配对样本t检验、Pearson相关、类内相关(ICC)和Bland-Altman分析分析试验间的试验差异和信度,所有试验均采用α = 0.05;数据以mean±sd报告。结果:各试验的功率(W)相似(773.0±143.5 vs 758.2±127.4;p = 0.333),变异系数(CV)为4.7%。VLamax (mM·L−1·s−1)相似(0.673±0.024∶0.635±0.237;p = 0.280),但在CV、ICC和R值分别为18.6%、0.661和0.67的试验中仅具有中等可靠性。BLC前CV和峰值CV分别为45.6%和23.3%。结论:15s VLamax循环冲刺具有中等可靠性,可能受到乳酸测量和计算中使用的其他变量的影响。更多的研究可能会提供提高可靠性的方法。
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