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首页> 外文期刊>Medicine and science in sports and exercise >Validity of a single-visit protocol to estimate the maximum lactate steady state.
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Validity of a single-visit protocol to estimate the maximum lactate steady state.

机译：单次访问协议对估计最大乳酸稳态的有效性。

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INTRODUCTION: The maximum lactate steady state (MLSS) represents the highest intensity of exercise at which a balance exists between the rate of lactate production and the rate of lactate clearance. The MLSS is an important determinant of endurance exercise performance but its determination, which involves 4-5 laboratory visits, is labor-intensive and time consuming. PURPOSE: To compare the MLSS estimated from a single-visit protocol (MLSSsingle) with the traditional, directly measured MLSS (MLSStrad). METHODS: Following an incremental treadmill test for the determination of VO2peak, eight endurance-trained runners completed: 1) a series of 4-5 constant-speed treadmill runs of up to 30-min duration, on separate days, for determination of the MLSStrad; and 2) a single-visit protocol consisting of two constant-speed treadmill runs of 20-min duration at approximately 65 and 90% VO2peak separated by 40 min of rest, for determination of MLSSsingle. Blood lactate concentration ([La]), oxygen uptake (VO2), and heart rate (HR) were measured every 5 min in all treadmill runs. Comparisons between values were made using paired t-tests. RESULTS: The MLSSsingle significantly underestimated the MLSStrad with respect to speed (13.4 +/- 1.2 vs 16.4 +/- 1.6 km x h(-1), P = 0.002), HR (148 +/- 8 vs 170 +/- 10 b x min(-1), P < 0.001), blood [La] (2.3 +/- 1.5 vs 3.9 +/- 1.0 mmol x L(-1); P = 0.01), and % VO2peak utilized (75 +/- 8 vs 90 +/- 2%, P = 0.002). The MLSStrad speed and MLSSsingle speed were poorly correlated (r = 0.29, P = 0.49). CONCLUSION: The single-visit method of determining the MLSS substantially underestimates the actual MLSS.
机译：简介：最大乳酸稳态（MLSS）代表最高的运动强度，在此状态下，乳酸的产生速度与乳酸清除率之间存在平衡。 MLSS是耐力运动表现的重要决定因素，但其确定（涉及4-5次实验室访问）是劳动密集型且耗时的。目的：将单次访问协议（MLSSsingle）估计的MLSS与直接测量的传统MLSS（MLSStrad）进行比较。方法：在用于确定VO2peak的递增式跑步机测试之后，完成了八名耐力训练的跑步者：1）在单独的几天中进行了一系列长达4分钟，持续30分钟的4-5恒速跑步机，以确定MLSStrad ; 2）单次访问协议，由两个等速跑步机组成，分别在65％和90％VO2peak的情况下以20分钟的持续时间运行，间隔40分钟的静止时间，用于确定MLSSsingle。在所有跑步机上，每5分钟测量一次血液中的乳酸浓度（La），摄氧量（VO2）和心率（HR）。值之间的比较是使用配对t检验进行的。结果：MLSSsingle相对于速度（13.4 +/- 1.2 vs 16.4 +/- 1.6 km xh（-1），P = 0.002），HR（148 +/- 8 vs 170 +/- 10 bx）明显低估了MLSStrad min（-1），P <0.001），血液[La]（2.3 +/- 1.5 vs 3.9 +/- 1.0 mmol x L（-1）; P = 0.01），以及所用的VO2peak百分比（75 +/- 8 vs 90 +/- 2％，P = 0.002）。 MLSStrad速度和MLSS单速相关性很差（r = 0.29，P = 0.49）。结论：单次访问确定MLSS的方法大大低估了实际MLSS。

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