Marras W S, King A I, Joynt R L
Spine (Phila Pa 1976). 1984 Mar;9(2):176-87. doi: 10.1097/00007632-198403000-00008.
Ten male and ten female subjects were tested for their ability to exert maximal force about the lumbo-sacral junction (as is done during lifting) under controlled isometric and isokinetic conditions. The myoelectric activity of ten trunk muscles, intra-abdominal pressure, and torque produced by the back were monitored. There are prominent differences in the manner in which subjects utilize the musculature of the trunk for the production of torque statically and dynamically. A significant lag was identified between the onset of intra-abdominal pressure and torque, and this lag increased with increasing trunk velocity. These differences between isometric and isokinetic exertions suggest that isokinetic trunk testing provides a means of controlled evaluation that is appropriate for manual materials handling situations.
对10名男性和10名女性受试者在等长和等速控制条件下围绕腰骶关节施加最大力量（如在举重过程中那样）的能力进行了测试。监测了10块躯干肌肉的肌电活动、腹内压和背部产生的扭矩。受试者在静态和动态产生扭矩时利用躯干肌肉组织的方式存在显著差异。腹内压和扭矩开始之间存在明显延迟，并且这种延迟随着躯干速度的增加而增大。等长和等速用力之间的这些差异表明，等速躯干测试提供了一种适用于人工搬运材料情况的可控评估方法。
