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首页> 外文期刊>Clinical biomechanics >Discrete bandwidth visual feedback increases structure of output as compared to continuous visual feedback in isometric force control tasks.
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Discrete bandwidth visual feedback increases structure of output as compared to continuous visual feedback in isometric force control tasks.

机译：与等距力控制任务中的连续视觉反馈相比，离散带宽视觉反馈增加了输出的结构。

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BACKGROUND: Performance variability measures provide a partial picture of force control ability. Nonlinear analyses can reveal important information related to the randomness and complexity of the data, providing a more complete picture of the physiological process. METHODS: We investigated the effects of visual feedback on the structure and performance of the force output from isometric force control tasks. Twelve young volunteers completed isometric force control tasks using two types of visual feedback: discrete bandwidth (+/-4% maximal voluntary contraction) and continuous line matching. We determined force signal variability (standard deviation), self-similarity (fractal dimension), and complexity (approximate entropy). Analyses of variance (feedback x muscle group x force level) were conducted and P values less than 0.05 were considered significant. FINDINGS: The force signal in discrete bandwidth feedback, compared to continuous line matching, had significantly a higher standard deviation (P=.000): 2.18 Nm (SD 1.98) vs. 0.99 Nm (SD 0.91); lower fractal dimension (P=.000): 1.07 (SD 0.04) vs. 1.16 (SD 0.04); and lower approximate entropy (P=.000): 0.12 (SD 0.07) vs. 0.26 (SD 0.09). INTERPRETATION: The greater self-similarity (lower fractal dimension) and greater regularity (lower approximate entropy) of the discrete bandwidth, compared to the continuous line matching, may indicate a process that required more kinesthetic (intrinsic) feedback to modulate force. Clinicians may choose to employ visual feedback paradigms that target the use of intrinsic feedback during rehabilitation. Discrete bandwidth feedback may be useful for delineating impairments in motor skill and measuring outcomes of intervention programs.
机译：背景：性能可变性度量提供了部分力控制能力的图片。非线性分析可以揭示与数据的随机性和复杂性有关的重要信息，从而提供更完整的生理过程图。方法：我们调查了视觉反馈对等距力控制任务输出力的结构和性能的影响。十二名年轻志愿者使用两种类型的视觉反馈完成了等距力控制任务：离散带宽（最大自愿收缩为+/- 4％）和连续线匹配。我们确定了力信号的可变性（标准偏差），自相似性（分数维）和复杂性（近似熵）。进行了方差分析（反馈x肌肉组x力水平），并且P值小于0.05被认为是显着的。发现：与连续线路匹配相比，离散带宽反馈中的力信号具有更高的标准偏差（P = .000）：2.18 Nm（SD 1.98）vs. 0.99 Nm（SD 0.91）;较低的分形维数（P = .000）：1.07（SD 0.04）和1.16（SD 0.04）;以及较低的近似熵（P = .000）：0.12（SD 0.07）和0.26（SD 0.09）。解释：与连续线匹配相比，离散带宽的更大的自相似性（更低的分形维数）和更大的规律性（更低的近似熵）可能表明该过程需要更多的动觉（本征）反馈来调节力。临床医生可以选择采用视觉反馈范例，这些范例针对康复期间使用内在反馈的情况。离散的带宽反馈对于描述运动技能损伤和测量干预计划的结果可能有用。

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