Dynamics of submaximal effort soccer instep kicking     

Hiroyuki Nunome  Koichiro Inoue  Kohei Watanabe  Takahito Iga  Hiroshi Akima 《Journal of sports sciences》2018,36(22):2588-2595

During a soccer match, players are often required to control the ball velocity of a kick. However, little information is available for the fundamental qualities associated with kicking at various effort levels. We aimed to illustrate segmental dynamics of the kicking leg during soccer instep kicking at submaximal efforts. The instep kicking motion of eight experienced university soccer players (height: 172.4 ± 4.6 cm, mass: 63.3 ± 5.2 kg) at 50, 75 and 100% effort levels were recorded by a motion capture system (500 Hz), while resultant ball velocities were monitored using a pair of photocells. Between the three effort levels, kinetic adjustments were clearly identified in both proximal and distal segments with significantly different (large effect sizes) angular impulses due to resultant joint and interaction moments. Also, players tended to hit an off-centre point on the ball using a more medial contact point on the foot and with the foot in a less upright position in lower effort levels. These results suggested that players control their leg swing in a context of a proximal to distal segmental sequential system and add some fine-tuning of the resultant ball velocity by changing the manner of ball impact.  相似文献   

Parental Participation and Accountability in Primary Schools in Uganda     

Ikuko Suzuki 《Compare》2002,32(2):243-259

Participation, a 'buzzword' in social development in both developed and developing countries, has several different interpretations in terms of purpose, form and implication. For instance, parents are encouraged to participate individually in choosing the school for their own children, and they are expected to participate collectively in school development through the work of school governing bodies. Furthermore, participation in education is often considered to be a means of assuring accountability of decentralised institutions. This paper explores the notion of parental participation in school governance, based on data obtained from field research in Uganda. It argues that parents' perceptions of the accountability of the school affect the way they participate in education. Thus, accountability is one of the crucial factors for realising local democracy through decentralisation.  相似文献