| 男少年股外肌快肌百分比及其无损推测指标 |
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| 引用本文： | 王立山,高强.男少年股外肌快肌百分比及其无损推测指标[J].北京体育大学学报,1993(3). |
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| 作者姓名： | 王立山 高强 |
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| 作者单位： | 北京体育学院科研所 北京100084
(王立山)，北京体育学院科研所 北京100084(高强) |
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| 摘 要： | 研究的主要目的是探索能够测定肌纤维组成的无损指标。首先让受试者做两次最大用力等长伸膝,较大的作为最大等长收缩力量(MVC)。测定出腿围(C)和相对肌力(MVC/C)等指标。在维持70%MVC 等长收缩至疲劳过程中,记录股外肌表面肌电图(EMG)信号和积分肌电图(IEMG)信号。受试者股外肌的肌纤维组成用活检测定法测定。实验结果表明,在维持70%MVC 等长收缩至疲劳过程中,肌电图功率谱平均功率频率(MPF)逐渐下降,IEMG 逐渐上升,股外肌FT%与MPF 的降低和IEMG 的上升之间存在线性相关。
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| 关 键 词： | 肌纤维组成 快肌纤维百分比(FT) 肌电图(EMG) 积分肌电图(IEMG) 平均功率频率(MPF) 等长收缩 肌肉疲劳 |
FT% of Vastus Lateral Muscle of Young Males and Its Non-invasive Indexes |
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| Wang Lishan Gao Qiang Research Institute,BIPE.FT% of Vastus Lateral Muscle of Young Males and Its Non-invasive Indexes[J].Journal of Beijing Sport University,1993(3). |
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| Authors: | Wang Lishan Gao Qiang Research Institute BIPE |
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| Institution: | Wang Lishan Gao Qiang Research Institute,BIPE.Beijing 100084 |
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| Abstract: | The purpose of the study was to determine the non-invasive indexes of the composition ofmuscle fiber.The subjects performed two maximal isometric knee extension,with the larger value recordedas MVC.Muscle circumference(C),relative muscle force(RMVC=MVC/C)and some other indexeswere measured.The surface electromyogram(EMG)and integrated EMG(IEMG)during fatiguingisometrie contraction at 70% MVC were recorded.Biopsy samples were obtained to measure the composi-tion of vastus lateral muscle fiber.The results showed a continuous decline in mean power frequency(MPP)and a continuous increase in IEMG.a linear relationship was found between the decline of MPPduring the sustained contraction and FT% and between the increase of IEMG and FT%. |
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| Keywords: | muscle fiber composition FT% EMG IEMG MPF isometric contraction muscle fatigue |
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