Optimal sampling frequency in recording of resistance training exercises

The purpose of this study was to analyse the raw lifting speed collected during four different resistance training exercises to assess the optimal sampling frequency. Eight physically active participants performed sets of Squat Jumps, Countermovement Jumps, Squats and Bench Presses at a maximal lifting speed. A linear encoder was used to measure the instantaneous speed at a 200 Hz sampling rate. Subsequently, the power spectrum of the signal was computed by evaluating its Discrete Fourier Transform. The sampling frequency needed to reconstruct the signals with an error of less than 0.1% was f_99.9 = 11.615 ± 2.680 Hz for the exercise exhibiting the largest bandwidth, with the absolute highest individual value being 17.467 Hz. There was no difference between sets in any of the exercises. Using the closest integer sampling frequency value (25 Hz) yielded a reconstruction of the signal up to 99.975 ± 0.025% of its total in the worst case. In conclusion, a sampling rate of 25 Hz or above is more than adequate to record raw speed data and compute power during resistance training exercises, even under the most extreme circumstances during explosive exercises. Higher sampling frequencies provide no increase in the recording precision and may instead have adverse effects on the overall data quality.     

优秀竞走运动员江姗姗冬训训练负荷研究

冬训是全年训练周期中唯一不受竞赛期影响,可长时间进行系统训练的准备期,对于提高运动员竞技能力和运动成绩尤为重要。以优秀女子竞走运动员江姗姗为研究个案,运用实地调查法、数理统计法对江姗姗2020年冬训期训练情况进行梳理和总结,探析其冬训期训练负荷和生理指标变化的特点和规律,旨在为竞走项目冬训期科学化训练提供有益参考。     

Do performance‐based research funding systems affect research production and impact?

We study the potential impact of introducing performance‐based funding systems (PBFS) on national research systems, using information on the number of publications and their scientific impact (citations or publications in top‐ranked journals) for 31 countries over the period 1996–2016. The analysis is performed both at the aggregate level and looking separately at each of the six main scientific areas identified according to the Organisation for Economic Co‐operation and Development (OECD) classification. On average, PBFS are found to increase the number of publications, though the effect is only temporary and fades after a few years. Looking at the scientific impact, PBFS are found to have a negligible effect on excellence as measured by the share of articles published in the top journals, irrespective of the type of assessment adopted. On the contrary, PBFS have some influence on average research quality, as measured by the number of citations per paper normalised with respect to the field.     

Assessment of Middle Ear Anatomy Teaching Methodologies Using Microscopy versus Endoscopy: A Randomized Comparative Study

Teaching methodologies for the anatomy of the middle ear have not been investigated greatly due to the middle ear’s highly complex structure and hidden location inside of the temporal bone. The aim of this randomized study was to quantitatively compare the suitability of using microscope- and endoscope-based methods for teaching the anatomy of the middle ear. We hypothesize that the endoscopic approach will be more efficient compared to the microscopic approach. To answer the study questions, 33 sixth-year medical students, residents and otorhinolaryngology specialists were randomized either into the endoscopy or the microscopy group. Their anatomical knowledge was assessed using a structured anatomical knowledge test before and after each session. Each participant received tutoring on a human cadaveric specimen using one of the two methods. They then performed a hands-on dissection. After 2–4 weeks, the same educational curriculum was repeated using the other technique. The mean gains in anatomical knowledge for the specialists, residents, and medical students were +19.0%, +34.6%, and +23.4%, respectively. Multivariate analyses identified a statistically significant increase in performance for the endoscopic method compared to the microscopic technique (P < 0.001). For the recall of anatomical structures during dissection, the endoscopic method outperformed the microscopic technique independently of the randomization or the prior training level of the attendees (P < 0.001). In conclusion, the endoscopic approach to middle ear anatomy education is associated to an improved gain in knowledge as compared to the microscopic approach. The participants subjectively preferred the endoscope for educational purposes.     

清代爱国将领依克唐阿遗存文物

依克唐阿，字尧山，满族，姓扎拉里氏（汉语译姓张），满族镶黄旗人，远祖居住在蒙古察哈尔，清雍正六年（1728午）移位今吉林伊通县境。道光十二年（1832年）依克唐阿生于伊通马家屯，为本族第七代袭爵人（世袭一等男爵）。依幼年寒苦，6岁父母双亡，被伯母接去寄养。稍长给邻居放猪，从小刚毅健壮，吃苦上进。18岁入伍从军，以马甲（兵丁）从征江南。[第一段]     

论陈鹤琴幼儿体育教育理论的现代价值

运用文献资料法、专家访谈法和逻辑分析法等研究方法,对陈鹤琴的幼儿体育教育理论进行研究。陈鹤琴幼儿体育教育理论体系包括幼儿健康第一的教育主张,和谐、全面发展的教育目的,融于五指活动的体育教育内容以及一切为儿童的体育教育原则等几个方面的内容,对我国幼儿教育事业的改革与发展产生了巨大影响。在贯彻《幼儿园教育指导纲要(试行)》和推进幼儿园课程改革与素质教育的今天,应充分认识与挖掘其幼儿体育教育理论所具有的多方面现实指导价值——高度关注幼儿的身心健康,发挥体育教育在幼儿素质教育过程中的特殊作用,倡导教育活动以游戏为基本形式,建立平等、合作与互动的师幼关系。     

Effects of cold water immersion on the recovery of physical performance and muscle damage following a one-off soccer match

The aim of this study was to assess the effects of a single session of cold or thermoneutral water immersion after a one-off match on muscular dysfunction and damage in soccer players. Twenty-male soccer players completed one match and were randomly divided into cryotherapy (10 min cold water immersion, 10°C, n = 10) and thermoneutral (10 min thermoneutral water immersion, 35°C, n = 10) groups. Muscle damage (creatine kinase, myoglobin), inflammation (C-reactive protein), neuromuscular function (jump and sprint abilities and maximal isometric quadriceps strength), and delayed-onset muscle soreness were evaluated before, within 30 min of the end, and 24 and 48 h after the match. After the match, the players in both groups showed increased plasma creatine kinase activity (30 min, 24 h, 48 h), myoglobin (30 min) and C-reactive protein (30 min, 24 h) concentrations. Peak jump ability and maximal strength were decreased and delayed-onset muscle soreness increased in both groups. However, differential alterations were observed between thermoneutral water and cold water immersion groups in creatine kinase (30 min, 24 h, 48 h), myoglobin (30 min), C-reactive protein (30 min, 24 h, 48 h), quadriceps strength (24 h), and quadriceps (24 h), calf (24 h) and adductor (30 min) delayed-onset muscle soreness. The results suggest that cold water immersion immediately after a one-off soccer match reduces muscle damage and discomfort, possibly contributing to a faster recovery of neuromuscular function.     

Exploring features for the automatic identification of user goals in web search

Queries submitted to search engines can be classified according to the user goals into three distinct categories: navigational, informational, and transactional. Such classification may be useful, for instance, as additional information for advertisement selection algorithms and for search engine ranking functions, among other possible applications. This paper presents a study about the impact of using several features extracted from the document collection and query logs on the task of automatically identifying the users’ goals behind their queries. We propose the use of new features not previously reported in literature and study their impact on the quality of the query classification task. Further, we study the impact of each feature on different web collections, showing that the choice of the best set of features may change according to the target collection.     

安徽怀远话声韵调之研究

怀远话属江淮官话，但是由于地理位置的特殊，又具有一定的过渡性。怀远话的声韵调系统中，有声母20个，韵母36个，声调5个。对怀远话的声韵调系统进行描写分析，不仅可以明确怀远话的声韵调与普通话的对应关系，而且有助于方言研究和推广普通话。     

经管类专业人才培养体系的转型与重构——以池州学院合作教育为例

依托多种资源,开展产学合作教育是应用型本科高校培养创新人才的重要途径。文章从合作教育视角探讨了池州学院经管类专业"面向市场,服务地方,合作办学,特色发展"的办学思路及经管类专业合作教育培养人才的资源整合问题;构建了经管类专业合作教育的人才培养目标及以能力为平台的课程教学体系;基于地方智库、产学合作平台建设、职业技能培养三类合作教育模式,探索总结池州学院经管类专业应用型创新人才培养的途径和方法。