Douris P C
Astoria Physical Therapy Associates, NY.
J Orthop Sports Phys Ther. 1993 Jan;17(1):31-5. doi: 10.2519/jospt.1993.17.1.31.
Exercise velocity may be an important variable in determining the amount of blood lactate accumulation during isokinetic exercise. The purpose of this study was to measure the effects of velocity-specific isokinetic exercise on blood lactate, muscle fatigue index, and rating of perceived exertion and to examine the relationship between blood lactate and muscle fatigue index. Ten experienced recreational weight trainers, aged 20-40 years, took part in a repeated measures design consisting of three separate treatments (constant angular velocity at 30, 120, and 300 degrees/sec performed at maximal effort for 1 minute by the right knee flexors and extensors). Rating of perceived exertion, blood lactate, and muscle fatigue index were measured in response to each treatment. Rating of perceived exertion was equal across all three speeds. Muscle fatigue and blood lactate increased significantly as the velocity of exercise increased. There was also a positive correlation coefficient (r = .82, < or = 0.01) between muscle fatigue index and blood lactate. The data suggested that the magnitude of muscle fatigue index and blood lactate responses are strongly dependent on the velocity of movement utilized during maximal isokinetic exercise, and there is a relationship between muscle fatigue index and blood lactate.
运动速度可能是决定等速运动期间血乳酸积累量的一个重要变量。本研究的目的是测量特定速度等速运动对血乳酸、肌肉疲劳指数和自觉用力程度评级的影响，并检验血乳酸与肌肉疲劳指数之间的关系。十名年龄在20至40岁之间、经验丰富的业余重量训练者参与了一项重复测量设计，该设计包括三种不同的处理方式（右膝屈肌和伸肌以最大努力分别在30、120和300度/秒的恒定角速度下进行1分钟）。针对每种处理方式测量自觉用力程度评级、血乳酸和肌肉疲劳指数。在所有三种速度下，自觉用力程度评级相同。随着运动速度的增加，肌肉疲劳和血乳酸显著增加。肌肉疲劳指数与血乳酸之间也存在正相关系数（r = 0.82，≤0.01）。数据表明，肌肉疲劳指数和血乳酸反应的程度强烈依赖于最大等速运动期间所采用的运动速度，并且肌肉疲劳指数与血乳酸之间存在关联。
