Fatigue detection in strength training using three-dimensional accelerometry and principal component analysis

Detection of neuro-muscular fatigue in strength training is difficult, due to missing criterion measures and the complexity of fatigue. Thus, a variety of methods are used to determine fatigue. The aim of this study was to use a principal component analysis (PCA) on a multifactorial data-set based on kinematic measurements to determine fatigue. Twenty participants (strength training experienced, 60% male) executed 3 sets of 3 exercises with 50 (12 repetitions), 75 (12 repetitions) and 100%-12 RM (RM). Data were collected with a 3D accelerometer and analysed by a newly developed algorithm to evaluate parameters for each repetition. A PCA with six variables was carried out on the results. A fatigue factor was computed based on the loadings on the first component. One-way ANOVA with Bonferroni post hoc analysis was calculated to test for differences between the intensity levels. All six input variables had high loadings on the first component. The ANOVA showed a significant difference between intensities (p < 0.001). Post-hoc analysis revealed a difference between 100% and the lower intensities (p < 0.05) and no difference between 50 and 75%-12RM. Based on these results, it is possible to distinguish between fatigued and non-fatigued sets of strength training.     

茄子、番茄异属间嫁接抗病增产效果初步研究

本试验采用茄子、番茄异属间嫁接,研究嫁接体生长发育、抗病增产效果及嫁接对果实品质的影响。结果表明:茄子/番茄二者共生亲和性较好,嫁接成活率较高,不同品种的番茄砧木对茄子的生长发育有不同的影响,但总的来说,嫁接改善了植株的生长势,黄萎病同期发病率、病情指数均低于对照且增产效果明显,嫁接后对果实的品质也没有不良的影响。总体来说,采用茄子、番茄异属间嫁接栽培具有可行性,嫁接栽培可望成为茄果类蔬菜克服连作障碍抗病增产的一项有效措施。     

房屋建筑预应力结构的发展趋势

本文论述了预应力结构住宅、大楼板、轻钢结构，筏基和箱基等方面的应用和发展趋势。     

一例癔症性感觉障碍的案例研究

从一般资料、评估诊断、咨询方案、咨询过程和讨论五个方面,对一例癔症性感觉障碍患者详细叙述,具体阐述了分析疗法和理性情绪疗法在癔症性感觉障碍咨询中的应用,最后评估了近期和远期的咨询效果。     

酸性化学镀镍络合剂的研究

通过考察乳酸,酒石酸,柠檬酸和有机酸Y组成的复合络合剂对镀速的影响,确定了合适的复合络合剂,其中复合络合剂由柠檬酸与有机酸Y组成,柠檬酸含量为10g/L,有机酸Y为20g/L.测定了该酸性化学镀镍的镀层的结合力以及孔隙率与耐蚀性,结果表明,该化学镀镍层光亮平整,结合力强,孔隙率分布较窄,耐硝酸点蚀120s,具有优良的耐蚀性能.     

MMSE多用户检测技术研究与分析

在CDMA（Code Divisin Muhiple Access,码分多址）通信系统中,由于多个用户的随机接人,所使用的扩频码集一般并非严格正交,码片之间的非零互相关系数将引起各用户间的干扰,这种干扰称为多址干扰．为了能够有效的抑制CDMA移动通信系统中的多址干扰,抗“远近效应”,就引进了多用户检测（MUD）．多用户检测技术在传统检测的基础上,能有效地消除MAI的影响,从而改善系统性能,增大系统容量．对系统中的多用户检测技术和与之密切相关的MMSE检测技术进行了研究．     

2014年“第61届美国运动医学会年会”专栏：从ACSM第61届年会看运动促进健康实施领域的未来趋势

摘 要：运动促进健康就是在运动医学及相关学科的基础上,通过健康测评和运动素质测评,为个体制定出全面、个性化、有针对性的完整运动方案及相关建议,并指导运动训练计划的完成,从而促进和保持个体健康的过程。近十几年来,“运动促进健康”作为改变生活方式、提升健康水平的新理念和新方法,被不断提出和研究。采用文献综述的方法,结合ACSM第61届年会的热门主题,提出“音乐伴随训练”、“合理抗阻练习”和“健身移动辅助工具的应用”是运动促进健康实施领域的未来趋势和有效手段,旨在为进一步推动运动促进健康项目在我国的发展提供指导依据。     

试析女大学生健身健美操锻炼对800m跑成绩的影响

女大学生耐力素质下降,这是一个不容回避的问题,现已得到人们普遍的重视。通过采用女大学生所喜爱的健身健美操锻炼来替代她们畏惧的长跑训练的方法,从而增强其心肺功能,改善女生呼吸系统状况,调节心理素质,为提高其800m跑的成绩奠定了良好的基础。     

用箱式电势差计校正电表实验的改进

原有箱式电势差计校正电表实验线路往往只能校正电表而不能同时测量电表的内阻，通过对电路加以改进可以克服这些缺点。     

‘They didn’t tell me anything’: women’s literacies and resistance in rural Mexico

Drawing from ethnographic case studies, this article considers issues of women’s access to education by exploring the literacy experiences of four women in rural Mexico. Ironically, as physical access to education in this area has increased, women’s literacy experiences have become more complex, rather than more libratory. Formal literacy, as it plays out for women in this community, is experienced as both an oppressive force as well as a tool for resistance to other forms of oppression. More importantly, the stories in this article highlight the socially dynamic nature of literacy as these four women utilise interpersonal relationships in order to subvert oppressive norms. These findings have implications both for theories of literacy as well as for educators who wish to work in more engaged ways with women and their children who emigrate from areas like rural Mexico.