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Effect of pedaling speed and load on EMG activity of biarticular muscles in thigh portion

踩踏速度和负荷对大腿双关节肌肌电活动的影响

基本信息

批准号：
07680138
负责人：
KATAMOTO Shizuo
金额：
$ 1.47万
依托单位：
Juntendo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680138/
关键词：
power output strength type and speed type pedaling EMG two joint muscle 積分筋電図抑制ペダリング運動

项目摘要

The purpose of this study was to examine the effect of pedaling speed and load on EMG activity of biarticular muscles in thigh portion, and to clariy the characteristics of EMG activity in relation to "strength type" and "speed type" of power output. Eleven collegiate men were asked to perform bicycle ergometer exercise at power outputs of 2.5, 3.5, 4.5, 5.5 and 6.5W/kg by constant pedaling speed (60rpm) and various pedaling speed (50, 70, 90, 110 and 130rpm) . During each pedaling exercise, surface EMG activities were recorded from right M.vastus lateralis, rectus femoris, biceps femoris caput breve and biceps femoris caput longum, The subjects were also asked to perform 4 supramaximal pedaling exercsie at loads of 5, 7.5, 10, and 12.5% of their body weight for 8sec to measure their maximal anaerobic power output and then they were classified into strength type or speed type group in relation to their power output characteristics. By increasing pedaling speed and load, IEMG/sec in all muscles studied were increased linealy. IEMG/W kg^<-1> of single articular muscles was decreased with incresing pedaling torque, but that of biarticular muscles was unchanged. On the other hand, increase of pedaling speed induced the decrease of IEMG/W kg^<-1> in biarticular muscles and no change in IEMG activities of sigle articular muscles. However, these tendency found in EMG activities were dependent on the type for power output. In speed type group, it was showed that IEMG/W kg^<-1> in M.rectus femoris and biceps femoris caput breve were decreased with increasing pedaling speed. From these results, it was suggested that by increasing pedaling speed, activity of biarticular muscles of thigh portion could be inhibited, and activities of rectus femoris and biceps femoris caput breve woud be responsible for development of speed type for anaerobic power output.

本研究旨在探讨蹬踏速度和负荷对大腿部双关节肌群肌电活动的影响，并阐明与力量型和速度型功率输出有关的肌电活动特征。对11名大学生进行了功率输出分别为2.5、3.5、4.5、5.5和6.5W/kg的自行车测功仪运动，分别采用恒定蹬速（60 rpm）和不同蹬速（50、70、90、110和130 rpm）。在每次踩踏板运动中，记录右侧股外侧肌、股直肌、股短头二头肌和股长头二头肌的表面肌电活动，并要求受试者在5、7.5、10 12.5%测定最大无氧功输出量，然后将受试者分为力量型和速度型两组，其功率输出特性。随着蹬踏速度和负荷的增加，所研究肌肉的IEMG/sec均呈线性增加。单关节肌的IEMG/W kg^<-1>随蹬踏力矩的增加而降低，而双关节肌的IEMG/W kg^无明显变化。另一方面，蹬速的增加导致双关节肌IEMG/W kg^的降低<-1>，而单关节肌IEMG活动无变化。然而，在肌电活动中发现的这些趋势取决于功率输出的类型。速度型组股直肌和股二头肌头短肌IEMG/W kg^<-1>随蹬踏速度的增加而降低。结果提示，提高蹬速可抑制股部双关节肌的活动，股直肌和股头短二头肌的活动是无氧功率输出速度型形成的原因。