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   

Lifesource XL-18 pedometer for measuring steps under controlled and free-living conditions     

Sam Liu  Dina Brooks  Scott Thomas  Gunther Eysenbach  Robert Peter Nolan 《Journal of sports sciences》2015,33(10):1001-1006

The primary aim was to examine the criterion and construct validity and test–retest reliability of the Lifesource XL-18 pedometer (A&D Medical, Toronto, ON, Canada) for measuring steps under controlled and free-living activities. The influence of body mass index, waist size and walking speed on the criterion validity of XL-18 was also explored. Forty adults (35–74 years) performed a 6-min walk test in the controlled condition, and the criterion validity of XL-18 was assessed by comparing it to steps counted manually. Thirty-five adults participated in the free-living condition and the construct validity of XL-18 was assessed by comparing it to Yamax SW-200 (YAMAX Health & Sports, Inc., San Antonio, TX, USA). During the controlled condition, XL-18 did not significantly differ from criterion (P > 0.05) and no systematic error was found using Bland–Altman analysis. The accuracy of XL-18 decreased with slower walking speed (P = 0.001). During the free-living condition, Bland–Altman analysis revealed that XL-18 overestimated daily steps by 327 ± 118 than Yamax (P = 0.004). However, the absolute percent error (APE) (6.5 ± 0.58%) was still within an acceptable range. XL-18 did not differ statistically between pant pockets. XL-18 is suitable for measuring steps in controlled and free-living conditions. However, caution may be required when interpreting the steps recorded under slower speeds and free-living conditions.  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   

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   

休闲与娱乐：西南民族村寨体育文化特征分析     

余贞凯 《楚雄师范学院学报》2015,(3)

西南地区是我国民族成分较多的区域之一,不仅民族成分众多,而且少数民族传统体育文化资源的数量较为庞大。其民族村寨体育无论是竞赛类,还是表演性质的竞技类、技巧类和综合类项目,均体现出较强的休闲娱乐特征,而且随着社会生活的演变,我们今天能够看到的民族村寨体育文化,其原有的功能已在逐渐退化,反而是休闲、娱乐与健身的功能日趋突出,它为村寨居民提供认同感和持续感,显示出我国文化的多样性和创造力,成为人们生活的重要组成部分。  相似文献   

数学是一种“脑具”     

陈晓江 《九江职业技术学院学报》2015,(1)

数学是大脑思考的工具,发挥数学的文化价值,帮助学生学会数学地思维,甚至通过数学学会思维,是高职数学课程的重要功能取向。  相似文献   

Legitimizing the Wound: Mapping the Military's Diagnostic Discourse of Traumatic Brain Injury     

Tom Lindsley 《Technical Communication Quarterly》2015,24(3):235-257

Following reports spanning from the beginning of the OEF (Operation Enduring Freedom) and OIF (Operation Iraqi Freedom) conflicts to the early 2010s, this rhetorical investigation analyzes the U.S. military's diagnostic practices used to identify mild traumatic brain injury (mTBI) in blast-affected troops. Considering the notion of “wound/injury” as a possible boundary object, this paper discusses how the conceptual framing of “invisible” injuries may produce interruptions of distrust that inhibit effective diagnosis.  相似文献   

公益活动与民航高职院校学生职业素质养成教育的契合性研究     

张予 《齐齐哈尔师范高等专科学校学报》2015,(3)

公益活动作为一种服务于公共利益的社会活动,具有实践性、公益性、扶弱性等特点,与民航高职院校学生的职业素质养成具有契合的可能性。广州民航职业技术学院作为一所行业院校,通过“亚运会”、“一奖两会”、“世广会”、“爱心服务队”等公益活动和组织,实现了两者的契合。为进一步促进契合的实际效果,应在深度合作、体系建设、激励制度等方面着力推进。  相似文献   

概念整合理论下的中国英语的词汇翻译研究     

于源 《海外英语》2015,(2)

国内对中国英语以及对中国英语中的词汇的翻译研究发展了近30年的时间,不同的人对中国英语中词汇的翻译问题所持有的态度也不同,传统的翻译方法自身存在的问题并不能够凸显中国英语作为一种具有中国特色的英语变体的特点,概念整合理论以其强大的认知阐释力证明了中国英语的词汇翻译是一种中国人独有的认知活动,从而进一步证明了中国英语是一种普遍存在的具有中国特色的英语变体。  相似文献