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Alexander H. Montoye Karin A. Pfeiffer Darijan Suton Stewart G. Trost 《Measurement in physical education and exercise science》2014,18(4):273-285
The responsiveness to change of the Actical and ActiGraph accelerometers was assessed in children and adolescents. Participants (N = 208) aged 6 to 16 years completed two simulated free-living protocols, one with primarily light-to-moderate physical activity (PA) and one with mostly moderate-to-vigorous PA. Time in sedentary, light, moderate, and vigorous PA was estimated using 8 previously developed cut-points (4 for Actical and 4 for ActiGraph) and 5-sec, 15-sec, and 30-sec epochs. Accelerometer responsiveness for detecting differences in PA between protocols was assessed using standardized response means (SRMs). SRM values ≥.8 represented high responsiveness to change. Both accelerometers showed high responsiveness for all PA intensities (SRMs = 1.2–4.7 for Actical and 1.1–3.3 for ActiGraph). All cut-points and epoch lengths yielded high responsiveness, and choice of cut-points and epoch length had little effect on responsiveness. Thus, both the Actical and ActiGraph can detect change in PA in a simulated free-living setting, irrespective of cut-point selection or epoch length. 相似文献
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Russell R. Pate Stewart G. Trost Gwen M. Felton Dianne S. Ward Marsha Dowda Ruth Saunders 《Research quarterly for exercise and sport》2013,84(3):241-248
Abstract The purpose of this study was to identify correlates of physical activity behavior in a sample of rural, predominantly African American youth. Three hundred sixty-one fifth-grade students from two rural counties in South Carolina (69% African American, median age = 11 years) completed a questionnaire designed to measure beliefs and social influences regarding physical activity, physical activity self-efficacy, perceived physical activity habits of family members and friends, and access to exercise and fitness equipment at home. After school physical activity and television watching were assessed using the Previous Day Physical Activity Recall (PDPAR). Students were classified as physically active according to a moderate physical activity standard: two or more 30-min blocks at an intensity of 3 METs (metabolic equivalents) or greater, and a vigorous physical activity standard: one or more 30-min blocks at an intensity of 6 METs or greater. According to the moderate physical activity standard, 34.9% of students were classified as low-active. Multivariate analysis revealed age, gender, television watching, and exercise equipment at home to be significant correlates of low activity status. According to the vigorous physical activity standard, 32.1% of the students were classified as low-active. Multivariate analysis revealed age, gender, television watching, and self-efficacy with respect to seeking support for physical activity to be significant correlates of low activity status. In summary, gender and the amount of television watching were found to be the most important correlates of physical activity in rural, predominantly African American youth. 相似文献
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《现代汉语词典》（第六版）的编撰结合了现当代语言科学发展的成果,在排序、选词、释义、引文上具有鲜明典范的特征。随着当代科技的进步,对照欧美词汇学发展的成果,《现代汉语词典》在选词、释义上出现了片面性、滞后性、高雅化、脱离生活等问题。这些问题的解决有赖于对先进的信息技术、语言学理论的吸收。从具体编撰实际上加以改进。 相似文献
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通过对广东省高科技企业员工的问卷调查,探讨人力资源管理实践、组织支持感与员工敬业度的关系。研究结果表明,人力资源管理实践和组织支持感对员工敬业度产生直接或间接的影响;组织支持感在人力资源管理实践对员工敬业度的影响中起完全中介作用。 相似文献
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Dowda M Pate RR Felton GM Saunders R Ward DS Dishman RK Trost SG 《Research quarterly for exercise and sport》2004,75(4):352-360
The purposes of this study were to describe and compare the specific physical activity choices and sedentary pursuits of African American and Caucasian American girls. Participants were 1,124 African American and 1,068 Caucasian American eighth-grade students from 31 middle schools. The 3-Day Physical Activity Recall (3DPAR) was used to measure participation in physical activities and sedentary pursuits. The most frequently reported physical activities were walking, basketball, jogging or running, bicycling, and social dancing. Differences between groups were found in 11 physical activities and 3 sedentary pursuits. Participation rates were higher in African American girls (p < or = .001) for social dancing, basketball, watching television, and church attendance but lower in calisthenics, ballet and other dance, jogging or running, rollerblading, soccer, softball or baseball, using an exercise machine, swimming, and homework. Cultural differences of groups should be considered when planning interventions to promote physical activity. 相似文献
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本文从云南多民族,民族分布地域广,民族地区经济文化相对落后这一现状出发,通过对一些民族地区现代教育技术发展现状调研结果、存在问题的分析,作者认为,教育技术理论在云南这样多民族地区的实践离不开少数民族。与内地及发达地区教育技术的理论与实践相比,云南民族地区教育技术理论与实践有其特点、难度。作者同时认为云南民族地区教育技术理论与实践是迫切需要的,又是极其重要的,根据云南民族地区的特点,现代教育理论与实 相似文献
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Derek R. Becker Megan M. McClelland Paul Loprinzi Stewart G. Trost 《Early education and development》2014,25(1):56-70
Research Findings: The present study investigated whether active play during recess was associated with self-regulation and academic achievement in a prekindergarten sample. A total of 51 children in classes containing approximately half Head Start children were assessed on self-regulation, active play, and early academic achievement. Path analyses indicated that higher active play was associated with better self-regulation, which in turn was associated with higher scores on early reading and math assessments. Practice or Policy: Results point to the benefits of active play for promoting self-regulation and offer insight into possible interventions designed to promote self-regulation and academic achievement. 相似文献
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本阐述了《机械设计基础》的教学对高职学生学习的重要性，总结该课程新的教学特点和过程，为后续课程打下好的基础。 相似文献
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In three experiments with rats, taste + odor interactions in compound aversion conditioning were investigated. In Experiment 1, two odors (0.02% almond and 0.02% orange) were compared on single-element odor aversions, taste (denatonium) potentiated odor aversions, and potentiated odor aversions following taste extinction. Although no odor differences were seen following single-element conditioning, both types of potentiated orange odor aversions were stronger than their almond odor counterparts. These data show that odors of similar conditionability are differentially potentiated by the same taste. To determine whether these differences were due to unique perceptual representations, the effects of elemental extinction or compound extinction on aversions to the compound were investigated in Experiments 2 and 3. In Experiment 2, orange odor extinction weakened responding to the compound significantly more than taste extinction did. In contrast, almond odor extinction and taste extinction produced similar decrements in responding to the compound in Experiment 3. These results suggest that the perceptual representation of these specific taste + odor compounds are different, and they are discussed in regard to configural and within-compound association accounts of potentiation. 相似文献