The effects of skinfold thicknesses and innervation zone on the mechanomyographic signal during cycle ergometry |
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Authors: | Jorge M Zuniga Terry J Housh Clayton L Camic C Russell Hendrix Haley C Bergstrom Richard J Schmidt Glen O Johnson[Author vitae] |
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Institution: | aDepartment of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, NE 68583, USA;bCollege of Science and Health, Department of Exercise and Sport Science, University of Wisconsin-La Crosse, 1725 State St. La Crosse, WI 54601, USA |
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Abstract: | The purpose of this study was to examine the effects of skinfold (SF) thicknesses at four locations on the vastus lateralis (VL) muscle and the placement of accelerometers relative to the innervation zone (IZ) on the mechanomyographic (MMG) amplitude and mean power frequency (MPF) responses during incremental cycle ergometry. Twenty adults (age ± SD = 23.8 ± 3.0 years) participated in the investigation. The MMG signals were detected during incremental cycle ergometry using four accelerometers placed on the right VL. Prior to the cycle ergometer test, SF thicknesses were measured. Simple linear regression analyses and one-way repeated measures analyses of variance (ANOVAs) were performed. The present study found that only 10% of the regression analyses and mean comparisons were significant (p < 0.05). Furthermore, the accelerometer placed at the most proximal site (Prox 2) had significantly greater MMG amplitude and MMG MPF than accelerometers placed at more distal sites (Prox 1, Over IZ, and Dist). There were no significant differences, however, in SF thickness between accelerometer placement sites. In addition, the IZ had no effect on MMG amplitude and little effect on MMG MPF values. The results of the present study indicated that the SF thickness values and IZ did not affect the MMG signal. |
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Keywords: | Innervation zone Accelerometer placement Pedaling exercise MMG |
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