Robergs R A, Chwalbinska-Moneta J, Mitchell J B, Pascoe D D, Houmard J, Costill D L
Human Performance Laboratory, Ball State University, Muncie, Indiana 47306.
Int J Sports Med. 1990 Dec;11(6):446-51. doi: 10.1055/s-2007-1024835.
The purpose of this study was to investigate the differences between lactate thresholds determined from venous and arterialized blood. Seven endurance-trained college males performed an incremental bicycle ergometer exercise test until exhaustion. At the end of each 3 min stage, blood was sampled simultaneously from a hyperemized ear-lobe and an antecubital vein for the measurement of blood lactate (La-). Two-minute rest intervals separated each stage. Arterialized blood La-concentrations ([La-]) were significantly higher than venous blood at 350 W (14.5 and 9.7 mmol.l-1), maximal exercise (15.5 and 11.39 mmol.l-1), and throughout recovery. Arterialized [La-] was significantly higher than venous blood at the onset of blood La- accumulation (OBLA) (4.0 and 2.8 +/- 0.1 mmol.l-1), the individual anaerobic threshold (IAT) (3.4 +/- 0.3 and 2.1 +/- 0.1 mmol.l-1), and the ventilatory threshold (VT) (4.7 +/- 0.9 and 3.2 +/- 0.6 mmol.l-1). No significant differences were found between either La-threshold for arterialized or venous blood. The oxygen consumption (VO2) at OBLA was significantly lower when determined from arterialized blood La (2.3 +/- 0.2 and 2.8 +/- 0.2 l.min-1). No significant differences existed between the LT, OBLA, and IAT threshold-VO2 determinations from arterialized blood; however, significant differences were found between IAT-OBLA (2.1 +/- 0.2 and 2.8 +/- 0.2 l.min-1) and LT (2.2 +/- 0.2 l.min-1)-OBLA from venous blood. These results indicate that differences between venous and arterialized blood [La-] need to be considered when comparing different anaerobic threshold determinations.
本研究的目的是调查从静脉血和动脉化血中测定的乳酸阈值之间的差异。七名受过耐力训练的大学男性进行了递增式自行车测力计运动测试，直至精疲力竭。在每个3分钟阶段结束时，同时从充血的耳垂和肘前静脉采集血样，用于测量血乳酸（La-）。每个阶段之间有2分钟的休息间隔。在350瓦（14.5和9.7毫摩尔/升）、最大运动时（15.5和11.39毫摩尔/升）以及整个恢复过程中，动脉化血的La-浓度（[La-]）显著高于静脉血。在血乳酸积累起始点（OBLA）（4.0和2.8±0.1毫摩尔/升）、个体无氧阈值（IAT）（3.4±0.3和2.1±0.1毫摩尔/升）以及通气阈值（VT）（4.7±0.9和3.2±0.6毫摩尔/升）时，动脉化的[La-]显著高于静脉血。动脉化血或静脉血的乳酸阈值之间未发现显著差异。根据动脉化血乳酸测定的OBLA时的耗氧量（VO2）显著更低（2.3±0.2和2.8±0.2升/分钟）。动脉化血的乳酸阈值（LT）、OBLA和IAT阈值-VO2测定之间不存在显著差异；然而，静脉血的IAT-OBLA（2.1±0.2和2.8±0.2升/分钟）与LT（2.2±0.2升/分钟）-OBLA之间存在显著差异。这些结果表明，在比较不同的无氧阈值测定时，需要考虑静脉血和动脉化血[La-]之间的差异。
