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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >The effects of accelerometer placement on mechanomyographic amplitude and mean power frequency during cycle ergometry
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The effects of accelerometer placement on mechanomyographic amplitude and mean power frequency during cycle ergometry

机译：周期测功过程中加速度计放置对机械测功幅度和平均功率频率的影响

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The purposes of this study were threefold: (1) to compare the power output related patterns of absolute and normalized MMG amplitude and MPF responses for proximal and distal accelerometer placements on the vastus lateralis (VL) muscle during incremental cycle ergometry; (2) to examine the influence of accelerometer placements on mean absolute MMG amplitude and MPF values; and (3) to determine the effects of normalization on mean MMG amplitude and MPF values from proximal and distal accelerometer placements. Fifteen adults (10 men and 5 women; mean ± SD age =23.9 ± 3.1 years) performed incremental cycle ergometry tests to exhaustion. Two accelerometers were placed proximal and distal on the VL muscle. Paired t-tests indicated that absolute MMG amplitude values for the proximal accelerometer were greater (p<0.05) than the distal accelerometer at all power outputs. The normalized MMG amplitude also had greater values for the proximal accelerometer at all power outputs, except 50. W. There were no differences, however, between proximal and distal accelerometers for absolute MMG MPF, except at 75. W, and normalization eliminated this difference. Twenty-seven percent of the subjects exhibited different power output related patterns of responses between accelerometer placements for MMG amplitude and 47% exhibited different patterns for MPF. These findings indicated that normalization did not eliminate the influence of accelerometer placement on MMG amplitude and highlighted the importance of standardizing accelerometer placements to compare MMG values during cycle ergometry.
机译：这项研究的目的是三方面的：（1）比较增量循环测功期间在外侧外侧肌（VL）上近端和远端加速度计放置的绝对和归一化MMG振幅和MPF响应的功率输出相关模式; （2）检查加速度计位置对平均MMG绝对振幅和MPF值的影响; （3）确定归一化对来自近端和远端加速度计位置的平均MMG振幅和MPF值的影响。 15名成年人（10名男性和5名女性;平均数±SD年龄= 23.9±3.1岁）进行了增量循环测功，以检测出疲劳。将两个加速度计放在VL肌肉的近端和远端。配对的t检验表明，在所有功率输出下，近端加速度计的绝对MMG振幅值均大于远端加速度计（p <0.05）。对于所有功率输出，近端加速度计的归一化MMG振幅也有较大的值，除了50.W。然而，绝对MMG MPF的近端加速度计和远端加速度计之间没有差异，除了在75. W处，归一化消除了这种差异。 27％的受试者对MMG振幅在加速度计位置之间表现出不同的功率输出相关响应模式，而47％的受试者对MPF表现出不同的响应模式。这些发现表明，归一化并不能消除加速度计放置对MMG振幅的影响，并且强调了标准化加速度计放置以在循环测功期间比较MMG值的重要性。

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