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首页> 外文期刊>Sports >The Effect of Set Up Position on EMG Amplitude, Lumbar Spine Kinetics, and Total Force Output During Maximal Isometric Conventional-Stance Deadlifts
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The Effect of Set Up Position on EMG Amplitude, Lumbar Spine Kinetics, and Total Force Output During Maximal Isometric Conventional-Stance Deadlifts

机译：设置位置对最大等距常规姿态硬拉期间的肌电幅度，腰椎动力学和总力输出的影响

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The purpose of this study was to examine the biomechanical differences between two set up variations during the isometric initiation of conventional barbell deadlifts (DL): Close-bar DL (CBDL), where the bar is positioned above the navicular, and far-bar DL (FBDL), where the bar is placed above the 3rd metatarsophalangeal joint. A cross-sectional, randomized, within-participant pilot study was used. Experienced powerlifters and weightlifters ( n = 10) performed three individual isometric pulls of the initiation of both conditions. The CBDL resulted in lower tibia and knee angles and greater pelvis and torso angles than the FBDL ( p 0.05), as well as greater electromyography (EMG) activity in the biceps femoris and upper lumbar erector spinae, but lower activity in the vastus lateralis, and a lower knee extensor moment ( p 0.05). There were no statistical differences for ground reaction force, joint reaction lumbar shear and compression forces between the two conditions. Despite the differences in pelvis and torso angles between lifting conditions, the internal joint net moment, internal shear forces, and internal compressive forces were not different between the two lifting styles. The CBDL set up also resulted in greater posterior chain (hamstrings and erector spine) EMG amplitude, whereas the FBDL set up resulted in more anterior chain (quadriceps) amplitude. Lifters and coaches may choose either deadlift style, according to preferences or training goals, without concern for differences in lumbar spinal loading.
机译：这项研究的目的是在常规杠铃硬拉（DL）的等距启动过程中研究两个设定变化之间的生物力学差异：闭合杆DL（CBDL），其中杆位于航海点上方，而远杆DL （FBDL），其中钢筋放置在第3 tar趾关节上方。使用了一项横断面，随机，参与性试验研究。经验丰富的举重运动员和举重运动员（n = 10）对这两个条件的开始进行了三个单独的等轴测图。与FBDL相比，CBDL导致胫骨和膝盖角度更低，骨盆和躯干角度更大（p <0.05），股二头肌和上腰直肌脊柱的肌电图（EMG）活性更高，但在股外侧肌中的活性较低，以及较低的膝盖伸肌力矩（p <0.05）。在两种情况下，地面反作用力，关节反作用腰部剪切力和压缩力没有统计学差异。尽管两种提升方式之间的骨盆角度和躯干角度有所不同，但内部关节的净力矩，内部剪切力和内部压缩力并没有不同。 CBDL设置还导致更大的后链（ham绳肌和直立脊柱）EMG幅度，而FBDL设置导致更大的前链（股四头肌）幅度。举重运动员和教练可以根据喜好或训练目标选择硬拉风格，而不必担心腰椎脊柱负荷的差异。

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