This study compared the oxygen uptake (VO2) and running velocity at which the lactate threshold (LT), the ventilatory threshold (VT), and the maximal lactate steady state (MSSLA), and the maximal VO2 steady state (MSSVO2) occurred in 11 trained male runners (mean age = 22.4 years, range 18-28 years). Each underwent an incremental treadmill test to exhaustion. The LT was defined by a systematic, continuous increase in arterialised venous blood lactate; the VT was determined by an abrupt rise in VE.VO2(-1) without an increase in VE.VCO2(-1). Each subject also completed a series of steady state treadmill runs of 20 minutes duration. The MSSLA was determined as the highest velocity and VO2 at which lactate concentration increased by less than 0.2 mmol.l-1 from minute 10 to minute 20. The MSSVO2 was determined as the highest velocity or VO2 at which a steady state in VO2 was not delayed for more than 3 minutes (with a steady state defined as VO2 within 0.2 l.min-1 of the average VO2 over the last 10 minutes of each test). Each subject also completed a 5 km time trial run to assess performance. No significant differences were found among the four variables expressed either as VO2 or velocity. Significant correlations were found between MSSLA and MSSVO2 (r = 0.74) expressed as VO2, and between MSSLA and MSSVO2 (r = 0.90), MSSVO2 and VT (r = 0.70) and MSSLA and VT (r = 0.67) expressed as velocity. A stepwise regression analysis found MSSLA (expressed as velocity) to be the best predictor of 5 km performance (r = 0.87). It was concluded that (a) MSSLA and MSSVO2 are closely related, and (b) MSSLA is a good predictor of performance and may be an important, objective measure of cardiorespiratory endurance capacity.

译文

:本研究比较了在以下情况下发生的乳酸阈值(LT),通气阈值(VT),最大乳酸稳态(MSSLA)和最大VO2稳态(MSSVO2)的摄氧量(VO2)和运行速度。 11位训练有素的男性跑步者(平均年龄= 22.4岁,范围18-28岁)。每个人都进行了递增的跑步机测试,以消耗体力。 LT的定义是动脉血静脉血乳酸的系统性,持续增加。 VT是由VE.VO2(-1)的突然升高而不是VE.VCO2(-1)的升高确定的。每个受试者还完成了一系列持续20分钟的稳态跑步机。 MSSLA被确定为从10分钟到20分钟乳酸浓度增加小于0.2 mmol.l-1的最高速度和VO2。MSSVO2被确定为VO2中未达到稳态的最高速度或VO2。延迟超过3分钟(在每次测试的最后10分钟内,稳定状态定义为VO2在平均VO2的0.2 l.min-1之内)。每个受试者还完成了5公里的时间试跑以评估表现。在以VO2或速度表示的四个变量之间没有发现显着差异。发现MSSLA和MSSVO2之间(r = 0.74)表示为VO2,MSSLA和MSSVO2(r = 0.90),MSSVO2和VT(r = 0.70)和MSSLA和VT(r = 0.67)表示为显着相关。逐步回归分析发现,MSSLA(表示为速度)是5 km表现的最佳预测指标(r = 0.87)。结论是:(a)MSSLA和MSSVO2密切相关,并且(b)MSSLA是性能的良好预测指标,并且可能是心肺耐力的重要客观指标。

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