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首页> 外文期刊>International Journal of Exercise Science >Association Between Different Non-Invasively Derived Thresholds with Lactate Threshold during Graded Incremental Exercise.
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Association Between Different Non-Invasively Derived Thresholds with Lactate Threshold during Graded Incremental Exercise.

机译：分级递增运动过程中，不同的非侵入性阈值与乳酸阈值之间的关联。

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International Journal of Exercise Science 11(4): 391-403, 2018. We compared lactate threshold (TLac)with non-invasive markers of an aerobic-anaerobic transition; namely, ventilatory (VT) and tissue saturation index (TSIT) thresholds. While identification of a breakpoint in blood lactate concentration ([BLa]) is common for determination of an aerobic-anaerobic transition, non-invasive measures, VT and NIRS, have also received attention as a means of determining this critical exercise intensity. We hypothesised that one or other of these non-invasive measures would have a strong association with TLac. Thirty-one (n=31) competitive male athletes (mean ± SD, age 29±9 yr, height 1.81±0.1 m, body mass 77.7±10.0 kg) performed graded incremental cycling to volitional exhaustion. Heart rate, TSI and gas exchange data were measured throughout and [BLa] was determined at fixed intervals. Threshold detection involved a segmented linear regression analysis minimising the squared sum of the residuals to determine TLac, TSIT and VT. Workload and HR at TLac, VT and TSIT were analysed using repeated measures ANOVA and correlation assessed using Pearson’s and interclass correlation coefficients. Thresholds at TSIT and TLac were not significantly different (255±35 vs. 249±30 W, P>0.05), suggesting that limitations in O2 delivery could be closely linked to an aerobic-anaerobic transition. However, poor correlation (r=0.55, ICC=0.54 and 95%LoA of +67 and -54 W) suggested other factors may exert an influence. Mean VT occurred at a significantly higher workload than TLac (271 ±35 vs 249±30 W, P<0.001). Consequently, VT proved less useful, giving an indication of when an aerobic-anaerobic transition had already occurred. In conclusion, non-invasive markers of the aerobic transition are not concurrent with TLac.
机译：国际运动科学杂志11（4）：391-403，2018.我们将乳酸阈值（TLac）与有氧-无氧转化的非侵入性标记进行了比较;即通气（VT）和组织饱和指数（TSIT）阈值。虽然确定血乳酸浓度（BLa​​）的断点对于确定有氧-无氧转变是很普遍的，但是非侵入性措施VT和NIRS也已经作为确定该关键运动强度的手段而受到关注。我们假设这些非侵入性措施中的一项或多项与TLac有很强的联系。 31名（n = 31）竞技男运动员（平均年龄±SD，年龄29±9岁，身高1.81±0.1 m，体重77.7±10.0 kg）进行了分步递增的循环，以达到体力消耗。在整个过程中测量心率，TSI和气体交换数据，并以固定间隔确定[BLa]。阈值检测涉及分段线性回归分析，该分析使残差的平方和最小，以确定TLac，TSIT和VT。使用重复测量方差分析（ANOVA）对TLac，VT和TSIT的工作量和HR进行分析，并使用Pearson和类间相关系数评估相关性。 TSIT和TLac的阈值没有显着差异（255±35 vs. 249±30 W，P> 0.05），表明O2输送的限制可能与有氧-厌氧转化密切相关。但是，相关性较差（r = 0.55，ICC = 0.54和+67和-54 W的95％LoA）表明其他因素也可能产生影响。平均VT发生的工作量显着高于TLac（271±35 vs 249±30 W，P <0.001）。因此，VT的用处不大，这表明何时发生了好氧-厌氧过渡。总之，有氧转化的非侵入性标志物与TLac不同时存在。

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