Miyagi Willian Eiji, Malta Elvis de Souza, Zagatto Alessandro Moura
Post-Graduate Program in Sciences Motricity, UNESP - Univ Estadual Paulista , Rio Claro - SP, Brazil ; Laboratory of Physiology and Sport Performance (LAFIDE), Faculty of Sciences, UNESP - Univ Estadual Paulista , Bauru - SP, Brazil.
Faculty of Sciences, Department of Physical Education, UNESP - Univ Estadual Paulista , Bauru - SP, Brazil ; Laboratory of Physiology and Sport Performance (LAFIDE), Faculty of Sciences, UNESP - Univ Estadual Paulista , Bauru - SP, Brazil.
J Sports Sci Med. 2015 May 8;14(2):372-8. eCollection 2015 Jun.
The aim of this study was to investigate the maximal oxygen uptake (VO2MAX) determined using the incremental phase of the lactate minimum test (LM) on a cycle ergometer. Fifteen trained men were submitted to a graded exercise test (GXT) to evaluate the VO2MAX and LM. The total durations of the GXT and LM were 11.2±1.8 minutes (CI95%:10.2-12.3 minutes) and 25.3±3.2 minutes (CI95%:23.5-27.0), respectively. For the variables measured at exhaustion in both the GXT and LM, the oxygen uptake (54.6 ± 8.1 ml·kg(-1)·min(-1) vs 50.0 ± 7.7 ml·kg(-1)·min(-1)), carbon dioxide production (66.1 ± 7.5 ml·kg(-1)·min(-1) vs 50.4 ± 8.0 ml·kg(-1)·min(-1)), ventilation (153.9 ± 19.0 L·min(-1) vs 129.9 ± 22.9 L·min(-1)), respiratory exchange ratio (1.22 ± 0.10 vs1.01 ± 0.05), maximal power output achieved (331.6 ± 45.8 W vs 242.4 ± 41.0 W), heart rate (183.1 ± 6.9 bpm vs175.9 ± 10.6 bpm) and lactate (10.5 ± 2.3 mmol·L(-1) vs 6.6 ± 2.2 mmol·L(-1)) were statistically lower in the LM (p < 0.05). However, the values of rating of perceived exertion (17.6 ± 2.5 for GXT and 17.2 ± 2.3 for LM) did not differ (ES = 0.12 and CV = 7.8%). There was no good agreement between the values of the VO2MAX from the GXT and VO2PEAK from the LM, as evidenced in the Bland-Altman plot (4.7 ml·kg(-1)·min(-1) and 0.34 L·min(-1) of mean differences, respectively), as well as the high values of the upper and lower limits of agreement. We conclude that the VO2PEAK values obtained in the incremental phase of the LM underestimate the VO2MAX. Key pointsThe VO2MAX is not attained during the incremental phase of the lactate minimum test;The physiological responses at exhaustion during LM are not similar to physiological responses measured during GXT;There is a weak agreement between the peak VO2 measured at exhaustion during LM and the VO2MAX measured during GXT.
本研究的目的是调查在自行车测力计上使用乳酸最低值测试（LM）的递增阶段测定的最大摄氧量（VO2MAX）。15名受过训练的男性接受了分级运动测试（GXT）以评估VO2MAX和LM。GXT和LM的总时长分别为11.2±1.8分钟（95%置信区间：10.2 - 12.3分钟）和25.3±3.2分钟（95%置信区间：23.5 - 27.0分钟）。对于在GXT和LM中力竭时测量的变量，LM中的摄氧量（54.6 ± 8.1 ml·kg⁻¹·min⁻¹ 对比 50.0 ± 7.7 ml·kg⁻¹·min⁻¹）、二氧化碳产生量（66.1 ± 7.5 ml·kg⁻¹·min⁻¹ 对比 50.4 ± 8.0 ml·kg⁻¹·min⁻¹）、通气量（153.9 ± 19.0 L·min⁻¹ 对比 129.9 ± 22.9 L·min⁻¹）、呼吸交换率（1.22 ± 0.10 对比1.01 ± 0.05）、达到的最大功率输出（331.6 ± 45.8 W 对比 242.4 ± 41.0 W）、心率（183.1 ± 6.9次/分钟 对比175.9 ± 10.6次/分钟）和乳酸（10.5 ± 2.3 mmol·L⁻¹ 对比 6.6 ± 2.2 mmol·L⁻¹）在统计学上较低（p < 0.05）。然而，主观用力程度评分值（GXT为17.6 ± 2.5，LM为17.2 ± 2.3）没有差异（效应量 = 0.12，变异系数 = 7.8%）。GXT的VO2MAX值与LM的VO2PEAK值之间没有良好的一致性，如Bland - Altman图所示（平均差异分别为4.7 ml·kg⁻¹·min⁻¹ 和0.34 L·min⁻¹），以及一致性上下限的高值。我们得出结论，在LM递增阶段获得的VO2PEAK值低估了VO2MAX。要点：在乳酸最低值测试的递增阶段未达到VO2MAX；LM力竭时的生理反应与GXT期间测量的生理反应不同；LM力竭时测量的峰值VO2与GXT期间测量的VO2MAX之间一致性较弱。
