ABSTRACT

This study evaluated the reliability of the portable Lactate Pro 2 analyzer (LP2), and its validity compared to a laboratory-based analyzer, YSI 1500 Sport (YSI). Blood samples (n = 258) were collected during 44 graded incremental rowing tests, with data from 17 tests used to quantify load, heart rate, and oxygen consumption at lactate threshold. Inter-LP2 reliability was high with coefficient of variation = 3.3%; Bland Altman 95% limits of agreement varied from ± 0.3 mmol.L⁻¹ for blood lactate (BLa) ≤4.0 mmol.L⁻¹ to −1.6 to +1.4 mmol.L⁻¹ for BLa >8.0 mmol.L⁻¹, with minimal systematic bias. Despite LP2 measurements being ~1.42 times higher than YSI measurements, no significant differences (P > .05) were detected when quantifying load, heart rate, or oxygen consumption data at lactate threshold. The results support using different LP2 devices interchangeably, especially when BLa ≤ 8 mmol.L⁻¹, and using the LP2 to identify training intensities at lactate threshold.

摘要

本研究评估了便携式乳酸 Pro 2 分析仪 (LP2) 的可靠性，以及与基于实验室的分析仪 YSI 1500 Sport (YSI) 相比的有效性。血液样本 (n = 258) 在 44 次分级增量划船测试中收集，17 次测试的数据用于量化负荷、心率和乳酸阈值的耗氧量。Inter-LP2 可靠性高，变异系数 = 3.3%；Bland Altman 95% 的一致性限制从 ± 0.3 mmol.L ^-1血乳酸 (BLa) ≤4.0 mmol.L ^-1到 -1.6 至 +1.4 mmol.L ^-1血乳酸>8.0 mmol.L ^-1，具有最小的系统偏差。尽管 LP2 测量值比 YSI 测量值高约 1.42 倍，但没有显着差异（P> .05) 在乳酸阈值下量化负荷、心率或耗氧量数据时检测到。结果支持交替使用不同的 LP2 设备，尤其是当 BLa ≤ 8 mmol.L ^{-1 时}，并使用 LP2 确定乳酸阈值的训练强度。