Validation of two accelerometers to determine mechanical loading of physical activities in children     

Ursina Meyer  Dominique Ernst  Silvia Schott  Claudia Riera  Jan Hattendorf  Jacqueline Romkes 《Journal of sports sciences》2015,33(16):1702-1709

The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4–15.7) years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100 Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland–Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P < 0.001). Data from ACT and GEN correlated with GRF (r = 0.90 and 0.89, respectively) and between each other (r = 0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.  相似文献   

消费者参与对体育品牌企业社会责任活动效果的影响机制研究     

王静一 《体育科学》2015,(2):24-30,47

体育品牌履行企业社会责任(CSR)的压力日益增加,但实践效果并不理想,CSR活动与消费者隔离是一个重要原因。通过两个实验研究,揭示了消费者参与对体育品牌CSR活动的影响,结果发现,1)消费者参与体育品牌CSR活动会提高其品牌态度和购买意向;2)企业社会责任认同在上述过程中起到中介作用;3)这一中介作用受到消费者对CSR活动与体育品牌之间感知匹配度的调节;讨论了对体育品牌CSR战略实践的启发。  相似文献   

影响弱势群体参与体育活动结果的归因及改善对策研究     

沈连梅 《湖北体育科技》2015,(5)

弱势群体参与体育活动的结果,反映他们自身对体育健身的需要,也反映他们参与全民健身的强烈欲望,从弱势群体参与体育活动的必要性、影响弱势群体参与体育活动的归因分析、改善"弱势群体"参与体育锻炼不良的归因对策方面进行研究,挖掘与发展体质弱势群体潜在的运动能力,为他们"健康工作五十年"、"幸福生活一辈子"打下坚实的基础。  相似文献   

Exploring the covariates of sport participation for health: an analysis of males and females in England     

Paul Downward  Simona Rasciute 《Journal of sports sciences》2015,33(1):67-76

Increasing sport participation has been identified as a key vehicle for achieving World Health Organisation guidelines for health-enhancing physical activity (HEPA). A policy challenge is to promote this changed behaviour. Making use of the Active People Survey, a zero-inflated ordered probit model is used to identify the covariates of sport participation for males and females with respect to the related decisions to either participate in sport or not, and to participate at either lower or higher than desired intensity. To inform current policy emphases, the Active Places Survey is also used to examine the causal impact of facility provision on these behaviours. Results indicate that females are more likely to adopt less intensive activity even with time available. Families could place most constraints on females, but also reduce the intensity of male participation. Education has a greater association with higher intensity female activity. The largest effects are identified for sport club membership and facility satisfaction. Both of these affect male intensity of activity most. The main policy challenges facing sport in contributing to HEPA are shown to involve retaining male intensity of participation when ageing and encouraging greater female intensity of participation, with more appropriate matching of facilities.  相似文献   

How much exercise are older adults living in nursing homes doing in daily life? A cross-sectional study     

Philipe De Souto Barreto  Laurent Demougeot  Bruno Vellas  Yves Rolland 《Journal of sports sciences》2015,33(2):116-124

Information on the amount of exercise practised by nursing home (NH) residents is scarce. This study aimed at describing NH residents’ participation in exercise classes, as well as to examine whether the presence of a professional exercise instructor in the facilities is associated with residents’ exercise habits. The cross-sectional data of 5402 residents (median age = 88 years; mostly women (75.2%)) from 163 NHs in France were analysed. Adjusted logistic and linear regressions were performed to examine whether the presence of a professional exercise instructor in the NH was associated with exercise habits: exercise participation, frequency, duration, and levels. From the 5402 participants, 1914 were participating in exercise classes provided in the NH. Most of them had an exercise frequency of 1x/week or less. Median duration of exercise sessions was 45 min. Exercise levels were rated as: highly active (n = 487), intermediately active (n = 1096), and poorly active (n = 331). The presence of a professional exercise instructor working in the facility was significantly associated with exercise participation and with higher exercise frequencies and levels, and session duration. In conclusion, the presence of professional exercise instructors is associated with better exercise habits in NH residents. Improved exercise habits may potentially be translated into better health in this population.  相似文献   

大学生志愿者参与公共危机管理的现状、问题及对策研究     

张斌  刘宇霞 《鸡西大学学报》2015,(8)

我国的志愿者服务于20世纪90年代兴起,并越来越活跃在社会生活中。在危机常态化的形势下,志愿者组织逐步发展成为处理公共危机不可或缺的力量。志愿者队伍大部分由青年人组成,其中被称为"社会精英"的大学生是最活跃和坚实的组成部分。大学生志愿者对公共危机管理积极有效的参与对提高全民危机意识和应对能力有巨大的带动作用。基于我国大学生志愿者参与公共危机管理的现状及存在的问题,深入分析其背后的原因,以提出有效的解决对策。  相似文献   

高职院校“生命化”主题实践活动的内容研究     

张和新 《长江工程职业技术学院学报》2015,(1):46-48

高职院校生命化主题实践活动的内容,可以归结为生命、生活、生态——"三生"内容。具体来讲,又可以细化为认识、处理四种关系:人与自身的关系,人与他人的关系,人与自然的关系,人与宇宙的关系。这其中体现生命化教育内容的三点特征:一是直面生命——以生命为教育的起点,二是在生命中——尊重生命的特性,三是为了生命——享受美好的生活和幸福人生。  相似文献   

茶树中咖啡酰辅酶A氧甲基转移酶的基因克隆及其催化活性研究(英文)     

Yue ZHANG  Hai-peng LV  Cheng-ying MA  Li GUO  Jun-feng TAN  Qun-hua PENG  Zhi LIN 《Journal of Zhejiang University. Science. B》2015,16(2):103-112

目的:从茶树中克隆一种可以催化表没食子儿茶素没食子酸酯(EGCG)生成甲基化EGCG的酶——咖啡酰辅酶A氧甲基转移酶(CCo AOMT),实现甲基化EGCG的酶学合成,为甲基化EGCG的进一步开发利用提供理论依据和技术指导。创新点:本研究首次从茶树中克隆了一条CCo AOMT基因组序列;分析了CCo AOMT基因在不同茶树品种和不同成熟度茶鲜叶中的基因表达规律;证明了CCo AOMT具有催化合成甲基化EGCG的生物活性。方法:采用聚合酶链式反应(PCR)和序列分析获得CCo AOMT的编码序列和基因组序列;采用高效液相色谱-四级杆-飞行时间串联质谱技术(HPLC-QTOF-MS)分析酶促反应生成的甲基化EGCG产物(图4);采用实时荧光定量PCR分析CCo AOMT基因的表达差异(图5)。结论:本研究从茶树中克隆了CCo AOMT基因的编码序列(738 bp)和基因组序列(2678 bp),明确了该基因具有4个内含子和5个外显子;揭示了CCo AOMT可以催化EGCG生成EGCG4"Me、EGCG3"Me和EGCG3’Me等多种甲基化产物;证明了CCo AOMT具有催化生成甲基化EGCG的活性;并发现该基因的表达量高低与茶鲜叶的成熟度呈正相关关系。  相似文献   

教学比赛:教师个体成长的阶梯——基于优秀教师PCK建构的个案研究     

薛国军  陈曦 《石家庄学院学报》2015,(1):100-104

教师在参加教学比赛过程中,课程改革的推动作用、教研活动的促进作用、名师培养机制和教师合作共同体的支撑,对教师个体专业发展具有非常重要的意义。因此,要加强教学比赛的示范引领作用,开展教研活动,激发教师PCK生成,促进教师专业发展,完善教师在职培养制度,为教师个体专业发展保驾护航。  相似文献   

Effect of microcystin-LR on protein phosphatase 2A and its function in human amniotic epithelial cells     

Liang J  Li T  Zhang YL  Guo ZL  Xu LH 《Journal of Zhejiang University. Science. B》2011,12(12):951-960

Due to their toxicity, the increased distribution of microcystins (MCs) has become an important worldwide problem. MCs have been recognized as inhibitors of protein phosphatase 2A (PP2A) through their binding to the PP2A catalytic subunit. However, the exact mechanism of MC toxicity has not been elucidated, especially concerning the cellular response and its autoregulation. To further dissect the role of PP2A in MC-induced toxicity, the present study was undertaken to determine the response of PP2A in human amniotic epithelial (FL) cells treated with microcystin-LR (MCLR), one of the MC congeners. The results show that a low-dose treatment of MCLR in FL cells for 6 h induced an increase in PP2A activity, and a high-dose treatment of MCLR for 24 h decreased the activity of PP2A, as expected. The increased mRNA and protein levels of the PP2A C subunit may explain the increased activity of PP2A. Furthermore, MCLR altered microtubule post-translational modifications through PP2A. These results further clarify the underlying mechanism how MCLR affects PP2A and may be helpful for elucidating the complex toxicity of MCLR.  相似文献