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首页> 外文期刊>Human movement science >Structure of force variability during squats performed with an inertial flywheel device under stable versus unstable surfaces
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Structure of force variability during squats performed with an inertial flywheel device under stable versus unstable surfaces

机译：在稳定与不稳定表面下的惯性飞轮装置进行蹲下蹲下的力变异结构

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The use of unstable surfaces during resistance training has demonstrated a maintenance or reduction on force production. However, the use of unstable surface on force variability has not been assessed using non-linear methods that may be better suited to detect changes in movement variability throughout a given movement. Consequently, this study compared the use of stable vs unstable surfaces on force variability during bilateral squats performed with an inertial flywheel device (Eccoteck, Byomedic System SCP, Spain). Twenty healthy men (mean +/- SD: age 22.9 +/- 2.9 years, height 1.81 +/- 0.7 m, body mass 76.4 +/- 7.6 kg and 1RM back squat 110.9 +/- 19.7 kg) with a minimum of four years in resistance training performed six sets of six repetitions of squats at maximal concentric effort with one minute rest between sets. Force output on the vertical axes was measured using a strain gauge and the results were processed using nonlinear sample entropy (SampEn). Results showed no differences for any of the dependent variables between stable and unstable conditions. SampEn showed no differences between conditions (chi-squared = 0.048 P = 0.827), while Force(mean) and SampEn presented a small correlation (r = 0.184; p < 0.01). No changes in entropy were found over the course of the series. Together, these results suggest that the structure of force variability between stable and unstable surfaces are similar. This lack of difference between surfaces may be due to postural and anticipatory adjustments. Consequently, by introducing unstable surfaces to the flywheel bilateral squat exercise, practitioners may not observe changes in Force mer , and force variability when compared to stable surface training suggesting that increased training volumes or intensity may be required during unstable environments to cause a desired training stimulus.
机译：阻力训练期间使用不稳定的表面已经证明对力产生维护或减少。然而，变异性力的使用不稳定的表面的没有被使用，其可以更适合于在整个给定的运动检测运动变异性的变化的非线性的方法评估。因此，该研究比较期间的惯性飞轮装置（Eccoteck，Byomedic系统SCP，西班牙）进行双边蹲使用稳定VS上力的变化不稳定的表面。 20名健康男性（平均+/- SD：年龄22.9±2.9岁，身高1.81±0.7男，体重76.4 +/-7.6千克和1RM背蹲110.9 +/-19.7公斤）与至少四多年的阻力训练与集之间的一个分钟的休息进行六组深蹲六个重复的最大同心努力。使用应变仪，测定在垂直轴力输出，并使用非线性样本熵（SampEn）的结果进行处理。结果表明：对于任何稳定和不稳定状态之间的因变量的没有区别。 SampEn显示条件之间没有差异（卡方= 0.048 P = 0.827），而组（平均值）和SampEn呈现小的相关性（r = 0.184，P <0.01）。熵不会改变被发现在一系列的过程。总之，这些结果表明，稳定和不稳定表面之间的力的变化的结构是相似的。这种缺乏表面之间的差异可能是由于体位和预调。因此，通过引入不稳定的表面，以在飞轮双边下蹲运动，从业者可能无法相比稳定的表面训练表明可能在不稳定的环境中可能需要增加训练容积或强度，以使所期望的训练刺激时观察力聚体的变化，力的变化。

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