Herda Trent J, Cooper Michael A
Neuromechanics Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, 1301 Sunnyside Ave, Room 101BE, Lawrence, KS, 66045, USA,
Med Biol Eng Comput. 2015 Aug;53(8):689-97. doi: 10.1007/s11517-015-1261-3. Epub 2015 Mar 25.
The purpose of this study was to examine the surface mechanomyographic mean power frequency (MMG MPF)-force relationships with linear regression models applied to the absolute and log-transformed values for the first dorsal interosseous (FDI), vastus lateralis (VL) and rectus femoris (RF) muscles. Thirteen healthy males performed isometric ramp contractions of the leg extensors and index finger from 10 to 80% of their maximal voluntary contraction with MMG sensors positioned on the VL, RF, and FDI. Simple linear regression models were fit to the absolute and log-transformed MMG MPF-force relationships. Skinfold thickness measurements were taken at each sensor site. There were significant differences for the slopes from the log-transformed MMG MPF-force relationships between the FDI and the leg extensors (P < 0.001) but not the absolute model (P = 0.168). The Y-intercepts were greater for the FDI than the leg extensors for the absolute (P < 0.001) and log-transformed models (P < 0.001), which reflected similar muscle-related differences (P < 0.001) for skinfold thickness. However, there were no significant correlations between Y-intercepts and skinfold thicknesses. Differences in the patterns of response between the FDI and leg extensors were only quantified with the log-transformed model.
本研究的目的是通过应用线性回归模型，研究拇短伸肌（FDI）、股外侧肌（VL）和股直肌（RF）肌肉的表面肌动图平均功率频率（MMG MPF）与力的关系，该模型应用于绝对和对数转换值。13名健康男性进行了腿部伸肌和食指的等长斜坡收缩，收缩强度从最大自主收缩的10%到80%，MMG传感器分别置于VL、RF和FDI上。简单线性回归模型适用于绝对和对数转换后的MMG MPF与力的关系。在每个传感器部位测量皮褶厚度。FDI与腿部伸肌之间，对数转换后的MMG MPF与力关系的斜率存在显著差异（P < 0.001），但绝对模型无显著差异（P = 0.168）。对于绝对模型（P < 0.001）和对数转换模型（P < 0.001），FDI的Y轴截距大于腿部伸肌，这反映了皮褶厚度方面类似的肌肉相关差异（P < 0.001）。然而，Y轴截距与皮褶厚度之间无显著相关性。FDI与腿部伸肌之间反应模式的差异仅通过对数转换模型进行量化。
