Pedometer reliability, validity and daily activity targets among 10- to 15-year-old boys     

Jago R  Watson K  Baranowski T  Zakeri I  Yoo S  Baranowski J  Conry K 《Journal of sports sciences》2006,24(3):241-251

The aims of this study were to: (1) determine whether the number of pedometer counts recorded by adolescents differs according to the adiposity of the participant or location on the body; (2) assess the accuracy and reliability of pedometers during field activity; and (3) set adolescent pedometer-based physical activity targets. Seventy-eight 11- to 15-year-old Boy Scouts completed three types of activity: walking, fast walking and running. Each type was performed twice. Participants wore three pedometers and one activity monitor during all activities. Participants were divided into groups of normal weight (BMI < 85th percentile) and at risk of being overweight (BMI > or = 85th percentile). Intra-class correlations across the three activities indicated reliability (r = 0.51 - 0.92, P < 0.001). This conclusion was supported by narrow limits of agreement that were within a pre-set range that was practically meaningful. Multivariate analysis of covariance indicated adiposity group differences, but this difference was a function of the increased stature among the larger participants (P < 0.001). Ordinary least-squares regression models and multi-level regression models showed positive associations between the number of pedometer and activity monitor counts recorded by the three groups of participants during all activities (all P < 0.001). The mean number of counts recorded for all participants during the fast walk was 127 counts per minute. In conclusion, the pedometers provided an accurate assessment of adolescent physical activity, and a conservative estimate of 8000 pedometer counts in 60 min is equivalent to 60 min of moderate to vigorous physical activity.  相似文献   

分析VS山寨DotA 6．57C火爆的原因     

DotA.UUU.CoM  I  Kua 《电子竞技》2009,(3):30-31

Data我已经近一年没有怎么碰过了,不是说我不喜欢DatA,我确信我一直都在深深的喜欢。但是自从两年前我把自己的爱好转变成了职业（一直做编辑嘛）,玩DatA的时候却一直提不起来兴趣。也难怪,天天看DatA相关的东西,想不审美疲劳都难,再也回不到当初把DatA当爱好的年代了。最近才感觉稍微好了一点,每天下班回家路人娱乐逐渐恢复水平。  相似文献   

Mixing methods in assessing coaches' decision making     

Vergeer I  Lyle J 《Research quarterly for exercise and sport》2007,78(3):225-235

Mixing methods has recently achieved respectability as an appropriate approach to research design, offering a variety of advantages (Tashakkori & Teddlie, 2003). The purpose of this paper is to outline and evaluate a mixed methods approach within the domain of coaches' decision making. Illustrated with data from a policy-capturing study on coaches' decisions about an injured gymnast's participation in competition, the approach involves the concurrent collection of quantitative and qualitative data and a three-phase process of data analysis. It is argued that (a) the method described can provide additional insights into the factors involved in coaches' decision making, beyond those provided via quantitative or qualitative methods alone, and (b) mixing methods holds promise for coaching research more generally.  相似文献   

Pedometer-determined physical activity and its comparison with the International Physical Activity Questionnaire in a sample of Belgian adults     

De Cocker K  Cardon G  De Bourdeaudhuij I 《Research quarterly for exercise and sport》2007,78(5):429-437

Pedometer-determined physical activity (PA) levels in Belgian adults were provided and compared to PA scores reported in the International Physical Activity Questionnaire (IPAQ). The representative sample (N=1239) of the Belgian population took on average 9655 (4526) steps/day. According to pedometer indices 58.4% were insufficiently active. Steps/day differed significantly between gender (F = 5.0, p = .026), age groups (F = 3.3, p = .01), employment status (F = 6.2, p = .013), and days of monitoring (F = 7.4, p = .007). Steps/day were negatively correlated to the time spent sitting and positively to PA at work, in transport, and in leisure time (p < .001). Steps data can discriminate between PA levels reported in the IPAQ. Belgian population pedometer-determined PA levels are higher than those reported in samples of the United States; however, there is a wide distribution of ambulatory behavior  相似文献   

马达加斯加岛的狐猴     

Tatte.  I 郭敏 《科学中国》1993,(5):31-38

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源自太阳的化学燃料     

Dostr.  I 王世德 《科学中国》1992,(4):34-39

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Inclusive education and personal development     

Leigh I 《Journal of deaf studies and deaf education》1999,4(3):236-245

Open-ended questionnaires covering mainstream educational experiences and personal development of deaf and hard-of-hearing adults were analyzed. Half of the 34 deaf and hard-of-hearing respondents altered self-labels based on changes in personal definitions rather than audiological changes. Supportive school environments and coping skills contributed to positive perceptions; nonsupportive school environments and being treated as 'different' were viewed negatively. Everyone valued contact with hearing peers. Contact with deaf peers depended on finding those with similar values. Identification with Deaf culture was nonexistent. Most noteworthy, 24 of 34 participants felt caught between the deaf and hearing worlds, indicating the need for niches in both. Implications for educators are that development of self-confidence and comfort with identity may be enhanced by validating the deafness dimension through opportunities for contact with deaf adults and positive relationships with both deaf and hearing peers.  相似文献   

大流域径流预报的混合模型     

J·E·Nash  B·I·Barsi  毛荣生 《长江工程职业技术学院学报》1992,(4)

格雷克和克沃科斯的研究表明:从最小二乘的意义上讲,在径流变化有明显的季节性特征的流域,把前几年(率定期)的同一时期的实测流量的平均值,作为简单的季节性预报值.要比用性能较好的降雨——流量模型得出的予报值好得多.本文试图把降雨——流量模拟的概念与纯粹的季节性预报方法结合起来,以便得到更好的预报结果,这一结果要优于上述两种方法.假设用季节性平均值偏差表示的降雨和流量的时间函数,线性相关(该假设可用世界气象组织资料检验)对比检验结果表明,利用混合模型求得的结果要比单独用季节性予报模型或用较完善的降雨——流量模型求得的结果好得多.因此,这类模型对具有明查季节性特征的大流域可能是很有用的.  相似文献   

CHECK LIST OF SOCIETY DIRECTORIES OF INTEREST TO MEDICAL LIBRARIANS     

Strieby I  Pond E 《Bulletin of the Medical Library Association》1938,27(1):75-82

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Scientific methods in the conservation of pictures     

RAWLINS I 《Endeavour》1948,7(27):104-110

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