Clark Brian C, Manini Todd M, Mayer John M, Ploutz-Snyder Lori L, Graves James E
Musculoskeletal Research Laboratory, Department of Exercise Science, Syracuse University, 820 Comstock Avenue, Room 201, Syracuse, NY 13244, USA.
Arch Phys Med Rehabil. 2002 Nov;83(11):1547-52. doi: 10.1053/apmr.2002.34828.
To evaluate the effects of exercise intensity and multiple sets on muscle activation patterns during trunk extension exercise.
Descriptive, repeated measures.
University-based musculoskeletal research laboratory.
Twenty volunteers recruited from a university setting.
Not applicable.
Electromyographic activity was recorded from the L3-4 paraspinal region, gluteus maximus, and biceps femoris muscles during multiple sets of trunk extension exercise at intensities representing 40%, 50%, and 70% of peak isometric force.
As exercise intensity increased, the electromyographic activity of the gluteus maximus increased to a greater extent than the activity of the paraspinal region. At the 50% intensity level, biceps femoris electromyographic activity was significantly greater than the paraspinal region electromyographic activity, whereas at the 70% intensity no differences were found between muscles. During multiple sets of exercise at the same intensity a muscle by set interaction was observed. This interaction revealed that with respect to other muscle groups, the electromyographic activity of the gluteus maximus increased between sets 1 and 2, whereas electromyographic decrements occurred in the paraspinal region. During exercise at the 40% intensity level, biceps femoris electromyographic activity increased to a greater extent between sets 1 and 2 when compared with the paraspinal region.
Exercise intensity and multiple sets result in alterations in muscle recruitment patterns of the lumbar and hip extensor muscles. These findings raise questions as to the efficacy of added loading and multiple sets during trunk extension exercise.
评估运动强度和多组训练对躯干伸展运动期间肌肉激活模式的影响。
描述性、重复测量研究。
大学附属的肌肉骨骼研究实验室。
从一所大学招募的20名志愿者。
不适用。
在多组躯干伸展运动期间，记录L3 - 4椎旁区域、臀大肌和股二头肌的肌电图活动，运动强度分别为等长肌力峰值的40%、50%和70%。
随着运动强度增加，臀大肌的肌电图活动比椎旁区域的活动增加幅度更大。在50%强度水平时，股二头肌的肌电图活动显著大于椎旁区域的肌电图活动，而在70%强度时，各肌肉之间未发现差异。在相同强度的多组运动期间，观察到肌肉与组次之间的相互作用。这种相互作用表明，与其他肌肉群相比，臀大肌的肌电图活动在第1组和第2组之间增加，而椎旁区域的肌电图活动出现下降。在40%强度水平的运动期间，与椎旁区域相比，股二头肌的肌电图活动在第1组和第2组之间增加幅度更大。
运动强度和多组训练会导致腰和髋部伸肌肌肉募集模式的改变。这些发现对躯干伸展运动期间增加负荷和多组训练的效果提出了疑问。
