Concurrent cognitive task may improve motor work performance and reduce muscle fatigue

Performance of certain cognitive tasks either during physical load or in rest pauses between boosts might lead to slowing of muscle fatigue and fatigue related decline in performance. Seventeen right-handed healthy volunteers (age 24 ± 1.4, 8 males) participated in this study, aiming to investigate the effect of the level of the cognitive information processing - 1) passive perception of audio stimuli, 2) active stimuli discrimination, 3) active stimuli discrimination following motor response - on motor task performance (handgrip test 30% and 7% of MVC) and muscle fatigue development. Cognitive tasks show the following effects on motor work: i) Perceived fatigue during 30 % MVC (fatiguing) condition developed slower if participant pressed button in response to deviant acoustic stimuli, as compared to passive listening. Counting task, an active task without motor component, took the intermediate position and did not differ significantly from two other cognitive tasks. ii) MVC after 30% MVC (fatiguing) condition tended to decrease stronger when accompanied with passive listening in comparison with both active tasks. iii) Motor task performance during 30% MVC (fatiguing) condition was better for active cognitive task with motor component than for passive task. Active task without motor component took the intermediate position and did not differ significantly from both the other cognitive tasks.     

非物质文化遗产保护的国际经验与国内实践——北京师范大学985工程特聘教授色音访谈

正文化是人类智慧的结晶,我们应该尊重和珍惜每一种文化。孟凡行(以下简称孟):色音老师,首先我对您在百忙之中专门抽出时间接受我的访谈表示感谢。我们知道,二十几年来,您一直在文化人类学、民俗学领域勤奋耕耘,取得了不菲的成就,引起了学界的瞩目。您学术基础宽厚、视野开阔、涉猎多门,在文化人类学、民俗学、宗教学、文化遗产学等领域都提出了一些颇具创新意义的见解。     

萨满教与北方少数民族的人生仪礼

本文认为 ,人生仪礼是在人生的重要转折时期或危机时期 ,如生死婚嫁等一个人一生中具有特殊意义的阶段上举行的民俗仪礼。在信仰萨满教的民族中 ,各种人生仪礼活动几乎都和萨满教发生一定的关系。     

试论北方少数民族生殖崇拜的萨满教根基

中国少数民族中较常见的生殖崇拜现象往往和萨满教的性神秘观相关。在萨满教神话、仪式以及萨满教巫术操作过程中几乎都有一些与性有关的内容。在萨满教观念中，性器是一个富有巫术力量的神秘器官。在北方民族萨满教后期发展中，生殖崇拜和祖先崇拜往往结伴而行     

Participative development of packages in the food industry--evaluation of ergonomics and productivity by objective measurements

Rationalizations generally have a negative effect on health and known risk factors for musculoskeletal disorders. These effects may be reduced by paying attention to modifiers as worker participation and a resonant management style. In this study a participatory approach was used in the food industry in order to improve ergonomics and productivity. The food industry shows a high prevalence of musculoskeletal disorders, and repetitive manual work occurs extensively. Prototypes of new packaging solutions were developed in three cases, and compared in a simulated production to the existing production system through direct measurements of working postures and muscle activity, ratings of physical load, and general productivity data. Measured and rated ergonomic exposures showed that workload was significantly lower for the prototypes, in all three cases. In two cases, the number of handling operations included in the packaging operations were greatly reduced with the prototype package, as were production costs. The impact on disorders of the obtained load reductions is difficult to assess, but we believe that in "critical" situations like this, even small improvements may have an effect. This study shows that workloads during manual handling of packages as well as production costs can be reduced by applying participative development of packages.     

蓬溪宝梵寺壁画艺术特征探析

文章通过对巴蜀地区蓬溪宝梵寺壁画造型特征、用线特征、用色特征、技法特征的提炼与分析,探索宝梵寺壁画独特的艺术风貌、地域特色以及象征意义等,挖掘其深层次的艺术审美价值。     

Motor variability--an important issue in occupational life

Several recent reviews have reported that 'repetitive movements' is a risk factor for occupational musculoskeletal disorders (MSD) in the neck, shoulder and arm regions. More variation in biomechanical exposure is often suggested as an effective intervention in such settings. While increasing variation using extrinsic methods like job rotation may not always be possible in an industrial context, the intrinsic variability of the motor system may offer an alternative opportunity to increase variation. Motor variability (MV) refers to the natural variation in postures, movements and muscle activity observed to different extents in all tasks. The current review explores the state of the art in MV research from motor control, sports and occupational biomechanics literature to answer whether MV is important to consider in an occupational context, and if yes, whether this literature stimulates further studies to test if MV can be manipulated as a deliberate intervention for increasing biomechanical variation without jeopardizing production.     

Statistical precision of categorical PATH observations of trunk posture

Background: Field studies assessing biomechanical occupational exposures frequently utilize direct observation. PATH (Postures, Activities, Tools, and Handling) is a tool for systematically observing occupational exposures during non-cyclic or long, irregular-cycle jobs. While PATH has been used in many studies, its statistical performance under different data collection strategies has not yet been investigated. The purpose of the current study was to examine this issue. Methods: Data from labourers performing the four tasks comprising a 'Jacking Pit Construction' operation was extracted from a previously collected data set. Using a probability based re-sampling bootstrap approach, categorical trunk posture exposure data was compared across nine simulated data collection strategies. Results/Conclusion: At the operational level, dispersion curves showed consistent trends of increased precision with increased sizes of the data set and curves tended to intersect at the expected value seen in the parent data set. At the task level, curves did not always follow the predicted pattern, highlighting the potential pitfalls of using PATH for infrequent tasks and the striking effect that individual workers can have on group exposure estimates of such tasks.     

沈宝基与法国革命诗歌译介

法国革命诗歌在中国的介与传播 ,曾极大地鼓舞中国人民的革命斗争。在众多的译者中 ,沈宝基是译介得最多、译品质量最高的翻译家之一。本文简略地介绍了沈先生在《国际歌》、《马赛区》贝郎瑞革命歌谣和巴黎公社诗歌汉译方面的杰出贡献与译介特点。