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Reproducibility of Blood Lactate Concentration Rate under Isokinetic Force Loads

机译：等渗力负荷下血乳酸浓度的重现性

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(1) Background: Maximum isokinetic force loads show strongly increased post-load lactate concentrations and an increase in the maximum blood lactate concentration rate ( V ˙ La max ), depending on load duration. The reproducibility of V ˙ La max must be known to be able to better assess training-related adjustments of anaerobic performance using isokinetic force tests. (2) Methods: 32 subjects were assigned to two groups and completed two unilateral isokinetic force tests (210° s ?1 , Range of Motion 90°) within seven days. Group 1 (n = 16; age 24.0 ± 2.8 years, BMI 23.5 ± 2.6 kg m ?2 , training duration: 4.5 ± 2.4 h week ?1 ) completed eight repetitions and group 2 (n = 16; age 23.7 ± 1.9 years, BMI 24.6 ± 2.4 kg m ?2 , training duration: 5.5 ± 2.1 h week ?1 ) completed 16 repetitions. To determine V ˙ La max , capillary blood (20 μL) was taken before and immediately after loading, and up to the 9th minute post-load. Reproducibility and variability was determined using Pearson and Spearman correlation analyses, and variability were determined using within-subject standard deviation (S w ) and Limits of Agreement (LoA) using Bland Altman plots. (3) Results: The correlation of V ˙ La max in group 1 was r = 0.721, and in group 2 r = 0.677. The S w of V ˙ La max was 0.04 mmol L ?1 s ?1 in both groups. In group 1, V ˙ La max showed a systematic bias due to measurement repetition of 0.02 mmol L ?1 s ?1 in an interval (LoA) of ±0.11 mmol L ?1 s ?1 . In group 2, a systematic bias of ?0.008 mmol L ?1 s ?1 at an interval (LoA) of ±0.11 mmol L ?1 s ?1 was observed for repeated measurements of V ˙ La max . (4) Conclusions: Based on the existing variability, a reliable calculation of V ˙ La max seems to be possible with both short and longer isokinetic force loads. Changes in V ˙ La max above 0.11 mmol L ?1 s ?1 due to training can be described as a non-random increase or decrease in V ˙ La max .
机译：（1）背景：最大等速运动负荷显示负荷后乳酸浓度显着增加，并且最大血液乳酸浓度比（V˙La max）随负荷持续时间的增加而增加。必须知道V˙La max的重现性，以便能够使用等速力测试更好地评估与训练有关的厌氧性能调整。 （2）方法：将32名受试者分为两组，并在7天内完成两次单侧等速力测试（210°s？1，运动范围90°）。第1组（n = 16;年龄24.0±2.8岁，BMI 23.5±2.6 kg m？2，训练时间：4.5±2.4 h周？1）完成八次重复训练，第2组（n = 16;年龄23.7±1.9岁， BMI 24.6±2.4 kg m？2，训练时间：5.5±2.1 h周？1）完成了16次重复。为了确定V˙La max，在加载前和加载后以及加载后第9分钟之前采集毛细血管血（20μL）。使用Pearson和Spearman相关分析确定可重复性和变异性，并使用Bland Altman图使用受试者内部标准差（S w）和一致限（LoA）确定变异性。 （3）结果：组1中V˙La max的相关性为r = 0.721，组2中r = 0.677。两组的V˙La max的S w为0.04 mmol L？1 s？1。在第1组中，由于在±0.11 mmol L？1 s？1的间隔（LoA）中重复进行0.02 mmol L？1 s？1的测量重复，V˙La max显示出系统性偏差。在第2组中，对于重复测量V˙La max，观察到系统误差为±0.008 mmol L？1 s？1，间隔（LoA）为±0.11 mmol L？1 s？1。 （4）结论：根据现有的可变性，对于等长和短等速载荷，似乎都可以可靠地计算V˙La max。由于训练导致的V˙La max超过0.11 mmol L？1 s？1的变化可以描述为V˙La max的非随机增加或减少。

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