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61.
想象训练对肌肉力量和肌电图RMS值的影响研究 总被引：3，自引：1，他引：2
想象训练对运动的影响表现在许多方面,为了研究想象训练对肌肉的影响,本文通过对想象训练在肌肉力量和肌电图RMS值的影响方面进行了研究,发现想象训练对增加运动员的肌肉力量有明显效果,想象训练对运动员肌电图也有一定影响. 相似文献
62.
为研究速滑陆地模仿练习的专项性,采用视频和表面肌电同步采集了王北星冰上专项和陆地模仿下肢支撑腿肌电参数,从主要做功肌群、肌肉激活强度和肌肉激活顺序三个角度研究冰上专项肌肉用力特征及陆地模仿练习的专项性。结果显示：冰上下肢专项肌肉用力特征是：胫骨前肌和股前群肌是主要做功肌群,胫骨前肌的屈过程激活程度更大,而股前群肌是蹬伸过程的激活程度更大,着冰前胫骨前肌就处于持续发力状态,蹬冰时灭活,着冰前股前群肌出现预激活,离冰时灭活。陆上滑跑模仿练习在主要做功肌群、肌肉激活强度屈伸间变化及肌肉激活顺序上与专项相似,具有较高的专项练习价值。但在肌肉激活强度、胫骨前肌做功时程和腓肠肌动员方面明显不足。建议：将来运动员在陆上进行此项练习时应在动作速度、非稳定支撑、着地前的足背屈和蹬伸末期伸踝等几个方面进行改善。 相似文献
63.
运用三维图像解析系统,采用三维摄像、三维测力台和表面肌电仪对两组不同级别男子武术套路运动员的仰身平衡和燕式平衡动作进行运动学、动力学和肌电学方面的研究,从生理学和运动生物力学角度分析仰身平衡和燕式平衡的技术特征和力学原理。 相似文献
64.
选取武汉体育学院普通男大学生11名，采用Vicon三维动作捕捉系统并结合表面肌电测试对受试者在不同的鞍座高度下骑行的运动学和肌肉力学指标进行同步采集，使用配对样本T检验分析比较不同高度骑行差异。结果：（1）膝关节活动范围在不同座高下呈显著变化，踝关节出现一定程度的变化，但个体差异较大。（2）鞍座高度增加，髋关节相对力矩下降，且90%座高与95%和100%座高相比存在显著性的差异（P<0.05）；膝关节相对力矩呈现出类似的变化且不同座高下存在显著差异（P<0.05）。（3）不同座高下，肌肉的放电量出现变化，但均无显著性差异（P>0.05）。其中股二头肌和胫前肌则是在95%座高时放电量达到最低。（4）随着鞍座高度的增加，髋关节和膝关节在90%、95%、100%大转子高的座高下相互之间均存在显著性的差异（P<0.05），踝关节的角速度在90%与100%座高相比和95%与100%座高相比时差异明显（P<0.05）。结论：95%大转子高时，股二头肌和胫前肌的放电量最小，股直肌、股外侧肌和腓肠肌的放电量处于中间值，膝关节力矩和活动范围也处于中间值。选取95%大转子高的鞍座高度更利于骑行者的骑行。 相似文献
65.
This paper is concerned with a control method for an exoskeleton ankle with electromyography (EMG) signals. The EMG signals
of human ankle and the exoskeleton ankle are introduced. Then a control method is proposed to control the exoskeleton ankle
using the EMG signals. The feed-forward neural network model applied here is composed of four layers and uses the back-propagation
training algorithm. The output signals from neural network are processed by the wavelet transform. Finally the control orders
generated from the output signals are passed to the motor controller and drive the exoskeleton to move. Through experiments,
the equality of neural network prediction of ankle movement is evaluated by giving the correlation coefficient. It is shown
from the experimental results that the proposed method can accurately control the movement of ankle joint.
Project supported by the National High-Tech R&D Program (Grant No.2006AA04Z224), the Innovation Program of Shanghai Municipal
Education Commission (Grant No.08ZZ48), and the Shanghai Leading Academic Discipline Project (Grant No.Y0102) 相似文献
66.
We investigated the association between changes in vastii electromyography (EMG) and knee extensor fatigue during high-intensity cycling, and the subsequent effect on lower-limb power and intermuscular coordination during all-out cycling. On two separate days, participants completed 30-s all-out cycling or 10-min of high-intensity cycling followed by 30-s all-out cycling. EMG for gluteus maximus (GMAX), rectus femoris (RF), vastii (VAS), hamstrings (HAM) and gastrocnemius (GAS); co-activation for GMAX/RF, VAS/HAM and VAS/GAS; isometric maximal voluntary force (IMVF) and resting twitch (RT) of the knee extensors were measured. VAS EMG increases during high-intensity cycling (6% to 14%, P < 0.05) were negatively correlated (r = ?0.791, P < 0.05) with knee extensor IMVF decreases (?2% to?36%, P < 0.05) following the exercise. Knee extensor IMVF decreases were positively correlated (r = 0.757, P < 0.05) with all-out cycling power reductions (0% to ?27%, P < 0.05). VAS/GAS co-activation did not change (P > 0.05) during all-out cycling while VAS and GAS EMG decreased. Larger increase in VAS EMG during high-intensity cycling was associated with greater knee extensor fatigue and larger power reduction during all-out cycling. High VAS/GAS co-activation potentially limited power reduction induced by knee extensor fatigue during all-out cycling. 相似文献
67.
为提高基于表面肌电信号的人体腰背动作识别率,提出一种基于小波包能量与改进NARX神经网络的分类识别新方法。利用小波包变换对动作部位进行表面肌电信号特征提取,并采用改进NARX神经网络进行分类识别。选取8名实验者分别在扭腰、弯腰、侧弯腰3种动作下进行表面肌电信号数据采集,选择db4小波包函数对信号进行6层分解,得到第6层64个频带的小波包分解系数,代表各个动作信息的特征向量,作为改进NARX神经网络的输入进行分类识别。对照实验组中,改进NARX神经网络的识别率较高,总体识别率达到96.7%。实验结果表明,利用该识别方法对腰部动作进行分类识别,分类准确,且识别率更高。 相似文献
68.
Sérgio Marta Luís Silva João Rocha Vaz Maria António Castro Gustavo Reinaldo Pedro Pezarat-Correia 《Journal of sports sciences》2016,34(8):713-720
The aim of this study was to describe and compare the EMG patterns of select lower limb muscles throughout the golf swing, performed with three different clubs, in non-elite middle-aged players. Fourteen golfers performed eight swings each using, in random order, a pitching wedge, 7-iron and 4-iron. Surface electromyography (EMG) was recorded bilaterally from lower limb muscles: tibialis anterior, peroneus longus, gastrocnemius medialis, gastrocnemius lateralis, biceps femoris, semitendinosus, gluteus maximus, vastus medialis, rectus femoris and vastus lateralis. Three-dimensional high-speed video analysis was used to determine the golf swing phases. Results showed that, in average handicap golfers, the highest muscle activation levels occurred during the Forward Swing Phase, with the right semitendinosus and the right biceps femoris muscles producing the highest mean activation levels relative to maximal electromyography (70–76% and 68–73% EMGMAX, respectively). Significant differences between the pitching wedge and the 4-iron club were found in the activation level of the left semitendinosus, right tibialis anterior, right peroneus longus, right vastus medialis, right rectus femuris and right gastrocnemius muscles. The lower limb muscles showed, in most cases and phases, higher mean values of activation on electromyography when golfers performed shots with a 4-iron club. 相似文献
69.
The aim of this study was to observe changes in the kinematics and muscle activities when barefoot running was initially adopted by six habitually shod, recreational rearfoot striking runners. Participants ran on a treadmill shod for 5 min, completed 3 × 10-min intervals of barefoot running and then completed a final minute of shod running at a self-selected pace. Dependent variables (speed, joint angles at foot-contact, joint range of motion (ROM), mean and peak electromyography (EMG) activity) were compared across conditions using repeated measures ANOVAs. Anterior pelvic tilt and hip flexion significantly decreased during barefoot conditions at foot contact. The ROM for the trunk, pelvis, knee and ankle angles decreased during the barefoot conditions. Mean EMG activity was reduced for biceps femoris, gastrocnemius lateralis and tibialis anterior during barefoot running. The peak activity across the running cycle decreased in biceps femoris, vastus medialis, gastrocnemius medialis and tibialis anterior during barefoot running. During barefoot running, tibialis anterior activity significantly decreased during the pre-activation and initial contact phases; gastrocnemius lateralis and medialis activity significantly decreased during the push-off phase. Barefoot running caused immediate biomechanical and neuromuscular adaptations at the hip and pelvis, which persisted when the runners donned their shoes, indicating that some learning had occurred during an initial short bout of barefoot running. 相似文献
70.
介绍了在损伤的远端神经与近端神经间利用微电子神经桥实现神经信道桥接的技术,设计并实施了一个实验方案,验证了微电子模块实现神经信道桥接的可行性.以信源脊蟾蜍在化学刺激下诱发的坐骨神经信号作为信号源,激励受控脊蟾蜍的坐骨神经,控制其动作.通过示波器观察并记录了信源脊蟾蜍坐骨神经信号、再生后的受控脊蟾蜍坐骨神经信号及其肌电信号.通过分析信源脊蟾蜍坐骨神经信号与受控脊蟾蜍坐骨神经信号以及受控脊蟾蜍坐骨神经信号与肌电信号间的互相干函数,证明再生后的受控脊蟾蜍坐骨神经信号与信源脊蟾蜍坐骨神经信号有关,并对受控脊蟾蜍的缩腿动作起着控制作用. 相似文献