首页> 外文会议>46th annual rocky mountain bioengineering symposium amp; 46th international ISA biomedical sciences instrumentation symposium 2009 >Ground Reaction Force Comparison of Bilateral Symmetry with Pneumatic Resistance Squat Device and Free Weights
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Ground Reaction Force Comparison of Bilateral Symmetry with Pneumatic Resistance Squat Device and Free Weights

机译:气动阻力蹲式装置和自由重物双向对称的地面反作用力比较

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INTRODUCTION: The unloading of spaceflight leads to bone and muscle atrophy, and a pneumatic resistance squat exercise countermeasure has the potential to provide optimized controllable resistance in a lightweight and compact configuration. However each end of the barbell in the proposed device is connected to a separate resistance cylinder which could lead to bilaterally asymmetric loading. Therefore, the purpose of the study is to compare the unilateral ground reaction forces (GRF) of the new squat device compared to free weights. METHODS: Four previously trained men (mean ± SD; age = 20±2 years, body mass = 99±18 kg) performed three sets of three repetitions of maximal exertion squat exercises with pneumatically controlled constant resistance and free weights each with a resistance level set to half of the body weight of each subject. Unilateral GRF data for each lifting modality at the negative to positive transition of the squat exercise was measured with a force plate under each foot. RESULTS: The pneumatic resistance GRF (N; mean ± SD) was 749±114 on the left leg and 786±123 on the right leg and the free weight GRF was 786±114 left and 861±111 right resulting in a 5% difference between left and right GRF with pneumatics and 9% difference with free weights. The correlation coefficient between left and right GRF was 0.92 with pneumatics and 0.80 with free weights. CONCLUSION: Because the pneumatic device elicited more bilaterally symmetric GRF than traditional free weights, the separate resistance cylinders are an acceptable design configuration.
机译:简介:航天飞机的卸载会导致骨骼和肌肉萎缩,而气动阻力下蹲运动对策有可能在轻巧紧凑的结构中提供最佳的可控阻力。然而,在所提出的装置中,杠铃的每一端都连接到单独的阻力筒,这可能导致双向不对称载荷。因此,研究的目的是比较新蹲式装置的单侧地面反作用力(GRF)与自由重量。方法:四名先前受过训练的男人(平均±SD;年龄= 20±2岁,体重= 99±18 kg)进行了三组,每组三个重复的最大下蹲练习,采用气动控制的恒定阻力和自由重量,每个阻力水平设置为每个受试者体重的一半。在下蹲练习的负向正向过渡过程中,每种举重方式的单边GRF数据均用每只脚下的测力板进行测量。结果:左腿气阻力GRF(N;平均值±SD)为749±114,右腿为786±123,自由重量GRF为左786±114和861±111,差异为5%左右GRF(带气动装置)之间的重量差,自由重量相差9%。气动时左右GRF之间的相关系数为0.92,自由重量时为0.80。结论:由于气动装置比传统的自由配重装置产生更多的左右对称GRF,因此单独的阻力缸是可以接受的设计配置。

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