Billat V, Dalmay F, Antonini M T, Chassain A P
Laboratory of Sports Science, University of Paris 12, Créteil, France.
Eur J Appl Physiol Occup Physiol. 1994;69(3):196-202. doi: 10.1007/BF01094788.
The aim of this study was to estimate the characteristic exercise intensity (WCL) which produces the maximal steady state of blood lactate concentration (MLSS) from submaximal intensities of 20 min carried out on the same day and separated by 40 min. Ten fit male adults [maximal oxygen uptake (VO2max) 62 (SD 7) ml.min-1.kg-1] exercised for two 30-min periods on a cycle ergometer at 67% (test 1.1) and 82% of VO2max (test 1.2) separated by 40 min. They exercised 4 days later for 30 min at 82% of VO2max without prior exercise (test 2). Blood lactate was collected for determination of lactic acid concentration every 5 min and heart rate and O2 uptake (VO2) were measured every 30 s. There were no significant differences at the 5th, 10th, 15th, 20th, 25th, or 30th min between VO2, lactacidaemia, and heart rate during tests 1.2 and 2. Moreover, we compared the exercise intensities (WCL) which produced the MLSS obtained during tests 1.1 and 1.2 or during tests 1.1 and 2 calculated from differential values of lactic acid blood concentration ([la-]b) between the 30th and the 5th min or between the 20th and the 5th min. There was no significant difference between the different values of WCL [68 (SD 9), 71 (SD 7, 73 (SD 6), 71 (SD 11)% of VO2max] (ANOVA test, P < 0.05). Four subjects ran for 60 min at their WCL determined from periods performed on the same day (test 1.1 and 1.2) and the difference between the [la-]b at 5 min and at 20 min (delta ([la-]b)) was computed.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是估计特征运动强度（WCL），该强度可在同一天以20分钟的次最大强度产生最大稳态血乳酸浓度（MLSS），且两次运动间隔40分钟。十名健康男性成年人[最大摄氧量（VO2max）为62（标准差7）毫升·分钟-1·千克-1]在功率自行车上进行两个30分钟的运动时段，分别为VO2max的67%（测试1.1）和82%（测试1.2），中间间隔40分钟。4天后，他们在无预先运动的情况下以VO2max的82%进行30分钟运动（测试2）。每5分钟采集血乳酸用于测定乳酸浓度，每30秒测量心率和摄氧量（VO2）。在测试1.2和测试2期间，第5、10、15、20、25或30分钟时，VO2、血乳酸水平和心率之间无显著差异。此外，我们比较了根据第30分钟和第5分钟之间或第20分钟和第5分钟之间血乳酸浓度（[la-]b）差值计算得出的、在测试1.1和1.2期间或测试1.1和2期间产生MLSS的运动强度（WCL）。不同WCL值[分别为VO2max的68（标准差9）%、71（标准差7）%、73（标准差6）%、71（标准差11）%]之间无显著差异（方差分析测试，P<0.05）。四名受试者以根据同一天进行的运动时段（测试1.1和1.2）确定的WCL进行60分钟跑步，并计算第5分钟和第20分钟时[la-]b的差值（δ([la-]b)）。（摘要截断于250字）
