Cerebral activity prior to motion task performance: an electroencephalographic study

Cerebral activity, as reflected by power in the alpha waveband (8-13 Hz), was examined prior to the performance of three tasks with different effort and accuracy requirements. The study aimed to further investigate changes in activity observed in an earlier study in which expert karate performers exhibited significant increases in alpha band power during preparation for a training task. In contrast to the earlier research, the high effort task produced a significant decrease in 'alpha' power prior to performance. 'Alpha' power prior to the high accuracy task showed significant differences mediated by the outcome. Successful performance was preceded by higher levels of 'alpha' power than unsuccessful attempts. The reported use of a cognitive strategy on the first task produced a significant difference in activity, lower alpha power being associated with the use of such a technique.     

Postexercise energy expenditure following upper body exercise

This study was designed to examine the magnitude and duration of excess postexercise oxygen consumption (EPOC) following upper body exercise, using lower body exercise for comparison. On separate days and in a counterbalanced order, eight subjects (four male and four female) performed a 20-min exercise at 60% of mode-specific peak oxygen uptake (VO2) using an arm crank and cycle ergometer. Prior to each exercise, baseline VO2 and heart rate (HR) were measured during the final 15 min of a 45-min seated rest. VO2 and HR were measured continuously during the postexercise period until baseline VO2 was reestablished. No significant difference between the two experimental conditions was found for magnitude of EPOC (t [7] = 0.69, p greater than .05). Mean (+/- SD) values were 9.2 +/- 3.3 and 10.4 +/- 5.8 kcal for the arm crank and cycle ergometer exercises, respectively. Duration of EPOC was relatively short and not significantly different (t [7] = 0.24, p greater than .05) between the upper body (22.9 +/- 13.7 min) and lower body (24.2 +/- 19.4 min) exercises. Within the framework of the chosen exercise conditions, these results suggest EPOC may be related primarily to the relative metabolic rate of the active musculature, as opposed to the absolute exercise VO2 or quantity of active muscle mass associated with these two types of exercise.     

计算机情报检索用户培训研究

The training for computer Search users is one of the essential guarantees for the computer information re-trieval to go on smoothly and an important means to gather the latest or fresh information quickly,accurately andcompletely as well.The text makes approaches ro the feasibility of the training of computer search users,evaluatesthe effectiveness of the training and puts forwards factors that exert impacts on the training work concerning infor-mation consciousness,information policies,etc.     

安徽高校图书馆文献资源建设的现状和建议

<正> (一)根据对全省35所高等学校图书馆的调查,安徽省高校图书馆文献资源总体状况可归纳为以下优势和不足:一、优势1.我省高校图书情报事业的发展格局和规模有了一定的基础。目前,全省高校藏书量达1068.38万册,其中中文线装书51.67万册,现刊有3.63万种,过刊7.87万种,并初步形成了各自的藏书特色,文献中教学用书体系形成了专业优势。另外,文献质量不断提高,满足需求的程度持续上升,已具有一定的文献保障水平。     

组合连接创新法在武术套路难度动作创新中的运用研究

采用文献资料研究法,对创新学方法中的组合法在武术套路难度动作创新中的运用进行研究。结果表明:在武术套路难度动作创新中,依据不同的角度对武术动作进行组合创新可以有各种形式,按对象组合连接创新可分为相同组别技术连接创新与不同组别技术连接创新;按原理组合连接创新可分为特性列举组合创新、缺点列举组合创新和希望点列举组合创新。