Electromyographic analysis of thigh muscles during track cycling on a velodrome     

Kohei Watanabe  Takayuki Sato  Takahiro Mukaimoto  Wataru Takashima  Michio Yamagishi  Tetsunari Nishiyama 《Journal of sports sciences》2016,34(15):1413-1422

We aimed to investigate neuromuscular activation of thigh muscles during track cycling at various speeds. Eight male competitive cyclists volunteered to participate in this study. Surface electromyography of the vastus lateralis, biceps femoris and adductor magnus muscles of the bilateral legs was recorded during track cycling on velodromes with a 250-m track. The participants were instructed to maintain three different lap times: 20, 18 and 16 s. The average rectified value (ARV) was calculated from the sampled surface electromyography. Significantly higher ARVs were observed in the right compared to left leg for the biceps femoris muscle during both straight and curved sections at 18- and 16-s lap times (P < 0.05). In the biceps femoris muscle, significant changes in ARVs during the recovery phase with an increase in speed were seen in the right leg only (P < 0.05). There were no significant differences in ARVs between the straight and curved sections for all three muscles (P > 0.05). From our findings, it was suggested that during track cycling on a velodrome the laterality of the biceps femoris muscle activity is a key strategy to regulate the speed, and fixed neuromuscular strategies are adopted between straight and curved sections for thigh muscles.  相似文献   

基于M型超声信号的心动周期自动检测     

徐鑫晶  大山航  若林哲史  木村文隆  吴坚 《滁州师专学报》2013,(5):31-34

M型超声波主要用于临床上心脏疾病的诊断,依据心肌的声学以及弹性特征,是一种无创性的诊断技术。本文提出了一种新的方法来自动判定心动周期。利用超声脉冲多普勒信号,对不同时刻的心脏振动进行相关性分析,找到两组一一对应的连续时点数列,从而判断出心脏运动的周期。本文最后进行了临床超声波数据的实验,并和医生的手动方法相比较。结果表明本文提出的检测方法达到了临床检测的效果,在心脏疾病的超声波诊断研究方面具有重要意义。  相似文献   

Analysis of cooperative research and development networks on Japanese patents     

Hiroyasu Inoue  Wataru Souma  Schumpeter Tamada 《Journal of Informetrics》2010,4(1):89-96

To sustain economic growth, countries have to manage systems in order to create technological innovation. To meet this goal, they are developing policies that organically connect companies, national laboratories, and universities into innovation networks. However, the whole structures of these connections have been little investigated because of the difficulty of obtaining such data.We use Japanese patent data and create a network of jointly applying organizations. This network can be considered as one representation of an innovation network because patents are seeds of innovation and joint applications are strong evidence of connections between organizations. We investigated the structure of the network, especially whether or not the degree distribution follows a power law. After that, we also propose a model that generates the actual network, not only degree distribution, but also link distance distribution.  相似文献   

Electrodes on a budget: Micropatterned electrode fabrication by wet chemical deposition     

Wataru Ebina  Amy C. Rowat    David A. Weitz 《Biomicrofluidics》2009,3(3)

Precise patterning of metals is required for diverse microfluidic and microelectromechanical system (MEMS) applications ranging from the separation of proteins to the manipulation of single cells and drops of water-in-oil emulsions. Here we present a very simple, inexpensive method for fabricating micropatterned electrodes. We deposit a thin metal layer of controlled thickness using wet chemistry, thus eliminating the need for expensive equipment typically required for metal deposition. We demonstrate that the resulting deposited metal can be used to fabricate functional electrodes: The wet-deposited metal film can sustain patterning by photolithography down to micron-sized features required for MEMS and microfluidic applications, and its properties are suitable for operative electrodes used in a wide range of microfluidic applications for biological studies.  相似文献