| 不同负荷强度运动时表面肌电图中位频率与血乳酸浓度变化的关系 |
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| 引用本文： | 王国祥.不同负荷强度运动时表面肌电图中位频率与血乳酸浓度变化的关系[J].体育学刊,2004,11(1):45-48. |
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| 作者姓名： | 王国祥 |
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| 作者单位： | 苏州大学,体育学院,江苏,苏州,215021 |
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| 摘 要： | 采用等速运动方式 ,以表面肌电图和血乳酸为指标 ,在 10 %、3 0 %和 50 %MVC三种负荷条件下 ,对肘关节屈伸运动时的肱三头肌、肱二头肌和前腕骨肌的表面肌电图和血乳酸浓度的变化进行了比较分析。结果表明 :(1)肘关节屈伸运动时 ,伸展运动的力矩峰值下降幅度大于屈曲运动。 (2 )以 3 0 %和 50 %MVC负荷强度运动时 ,出现了表面肌电图的MF值逐步下降和血乳酸浓度逐渐增加的现象 ;工作肌群MF下降幅度 ,由大到小依次为肱三头肌 >肱二头肌 >前腕骨肌。 (3 )肱三头肌、肱二头肌和前腕骨肌的表面肌电图的MF变化与血乳酸浓度变化相互比较 ,10 %、3 0 %和 50 %MVC三种运动形式都表现出了非常明显的相关性。实验结果可以说明 ,sEMG作为特异性良好的非损伤性检测手段 ,不但能够直观地反映肌肉的收缩活动 ,还与肌肉组织代谢变化有一定的相关关系
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| 关 键 词： | 表面肌电图 中位频率 血乳酸 |
| 文章编号： | 1006-7116(2004)01-0045-04 |
| 修稿时间： | 2003年9月5日 |
Relation between changes of sEMG's mean frequency and changes of blood lactate content with different loads during exercise |
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| WANG Guo,xiang.Relation between changes of sEMG''''s mean frequency and changes of blood lactate content with different loads during exercise[J].Journal of Physical Education,2004,11(1):45-48. |
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| Authors: | WANG Guo xiang |
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| Abstract: | This study applies dynamic isokinetic to make a research on relation between sEMG's mean frequency (MF) and blood lactate content with different loads as 10%,30% and 50%MVC on triceps muscle, biceps muscle, and brachioradialis muscle. MF and blood lactate were used as parameters for a comparative analysis. The results indicated that:(1)During flexion and extension of elbow joint, peak torque descended more dramatically in course of extension than in flexion. (2)30% and 50% MVC witnessed a step-by-step dissension in MF, and a step-by-step ascension of blood lactate content. MF's dissension extent for working muscles tapered off as triceps muscle, biceps muscle, and brachioradialis muscle.(3)The comparative analysis indicated that changes of MF and changes of blood lactate content have correlated with each other significantly in 10%, 30% and 50%MVC. Thus,results of the research revealed that sEMG could play a specific and noninjurious role in examination, directly reflecting motion of muscles, and correlating with metabolic changes in muscle tissues as well. |
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| Keywords: | sEMG mean frequency blood lactate |
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