Green S, Dawson B T, Goodman C, Carey M F
School of Human Movement Studies, Queensland University of Technology, Brisbane, Australia.
Eur J Appl Physiol Occup Physiol. 1994;69(6):550-6. doi: 10.1007/BF00239874.
The degree to which the y-intercept (Y-int) of the linear regression of maximal work output on exercise duration represented anaerobic capacity was determined in ten well-trained male cyclists [peak oxygen uptake (VO2peak) = 69.8 (SD 4.2) ml.kg-1.min-1]. Each cyclist performed three exhausting cycle sessions on separate occasions; the mean exercise durations were 312, 243 and 141 s for the low (approximately 104% VO2peak), medium (approximately 108% VO2peak) and high (approximately 113% VO2peak) intensities respectively, and Y-int (kilojoules; joules per kilogram) was derived from the regression of work output on exercise duration. The muscle anaerobic adenosine 5'-triphosphate (ATP) yield (sigma ATP) and anaerobic capacity (AC) were estimated from changes in metabolites in the vastus lateralis muscle and blood lactate concentration during the high intensity cycling session. The activities of glycogen phosphorylase, phosphofructokinase and citrate synthase, as well as muscle buffer value (in vitro beta) were also determined. The Y-int (kilojoules) was positively correlated (P < or = 0.05) with AC (r = 0.73), sigma ATP (r = 0.70) and in vitro beta (r = 0.71); similar correlations (P < or = 0.05) were observed for Y-int (joules per kilogram). The Y-int was not correlated (P > 0.05) with any enzyme activity.(ABSTRACT TRUNCATED AT 250 WORDS)
在10名训练有素的男性自行车运动员中（峰值摄氧量[VO₂峰值]=69.8（标准差4.2）ml·kg⁻¹·min⁻¹），确定了最大功输出对运动持续时间的线性回归的y轴截距（Y-int）代表无氧能力的程度。每位自行车运动员在不同时间进行了三次力竭性骑行训练；低强度（约104%VO₂峰值）、中等强度（约108%VO₂峰值）和高强度（约113%VO₂峰值）训练的平均运动持续时间分别为312、243和141秒，Y-int（千焦；每千克焦耳）由功输出对运动持续时间的回归得出。通过高强度骑行训练期间股外侧肌代谢物变化和血乳酸浓度估算肌肉无氧三磷酸腺苷（ATP）产量（σATP）和无氧能力（AC）。还测定了糖原磷酸化酶、磷酸果糖激酶和柠檬酸合酶的活性以及肌肉缓冲值（体外β）。Y-int（千焦）与AC（r = 0.73）、σATP（r = 0.70）和体外β（r = 0.71）呈正相关（P≤0.05）；Y-int（每千克焦耳）也观察到类似的相关性（P≤0.05）。Y-int与任何酶活性均无相关性（P>0.05）。（摘要截短至250字）
