New insight for activity intensity relativity,metabolic expenditure during object projection skill performance

This study examined the metabolic cost (METs) of performing object projection skills at three practice trial intervals (6, 12, and 30 seconds). Forty adults (female n = 20) aged 18–30 (M = 23.7 ± 2.9 years) completed three, nine-minute sessions of skill trials performed at 6, 12, and 30 second intervals. Participants performed kicking, throwing and striking trials in a blocked schedule with maximal effort. Average METs during each session were measured using a COSMED K4b2. A three (interval condition) X two (sex) ANOVA was conducted to examine differences in METs across interval conditions and by sex. Results indicated a main effect for interval condition (F(5,114) = 187.02, p < .001, η² = 0.76) with decreased interval times yielding significantly higher METs [30 sec = 3.45, 12 sec = 5.68, 6 sec = 8.21]. A main effect for sex (F(5, 114) = 35.39, p < .001, η² = 0.24) also was found with men demonstrating higher METs across all intervals. At a rate of only two trials/min, participants elicited moderate physical activity, with 12 and 6-second intervals exhibiting vigorous PA. Demonstrating MVPA during the performance of object projection skill performance has potential implications for PA interventions.     

A model for using a concept inventory as a tool for students' assessment and faculty professional development

This essay describes how the use of a concept inventory has enhanced professional development and curriculum reform efforts of a faculty teaching community. The Host Pathogen Interactions (HPI) teaching team is composed of research and teaching faculty with expertise in HPI who share the goal of improving the learning experience of students in nine linked undergraduate microbiology courses. To support evidence-based curriculum reform, we administered our HPI Concept Inventory as a pre- and postsurvey to approximately 400 students each year since 2006. The resulting data include student scores as well as their open-ended explanations for distractor choices. The data have enabled us to address curriculum reform goals of 1) reconciling student learning with our expectations, 2) correlating student learning with background variables, 3) understanding student learning across institutions, 4) measuring the effect of teaching techniques on student learning, and 5) demonstrating how our courses collectively form a learning progression. The analysis of the concept inventory data has anchored and deepened the team's discussions of student learning. Reading and discussing students' responses revealed the gap between our understanding and the students' understanding. We provide evidence to support the concept inventory as a tool for assessing student understanding of HPI concepts and faculty development.     

Comparison of Indirect Calorimetry- and Accelerometry-Based Energy Expenditure during Object Project Skill Performance

This study compared the energy expenditure (EE) levels during object projection skill performance (OPSP) as assessed by indirect calorimetry and accelerometry. Thirty-four adults (female n = 18) aged 18–30 (23.5 ± 2.5 years) performed three, 9-min sessions of kicking, over-arm throwing, and striking performed at 6-, 12-, and 30-sec intervals. EE was estimated (METS) using indirect calorimetry (COSMED K4b2) and hip-worn accelerometry (ActiGraph GT3X+). EE using indirect calorimetry demonstrated moderate-intensity physical activity (3.4 ± 0.7 METS––30-sec interval, 5.8 ± 1.2 METS––12-sec interval) to vigorous intensity physical activity (8.3 ± 1.7 METS––6-sec interval). However, accelerometry predicted EE suggested only light-intensity physical activity (1.7 ± 0.2 METS––30-sec interval, 2.2 ± 0.4 METS––12-sec interval, 2.7 ± 0.6 METS––6-sec interval). Hip-worn, ActiGraph GT3X+ accelerometers do not adequately capture physical activity intensity levels during OPSP, regardless of differences in skill performance intervals.     

基于过程的电子政务公众采纳研究框架

公众的采纳是电子政务发展的基本条件之一.通过分析个体采纳过程的主流研究模型,结合电子政务的特点,对电子政务公众采纳过程进行阶段划分,提出基于过程的电子政务公众采纳研究框架.以此为基础,分别探讨了采纳前阶段公众对电子政务服务(概念)采纳意向,以及采纳后阶段用户对政府门户网站(载体)持续使用意向的关键影响因素.     

Children’s metabolic expenditure during object projection skill performance: New insight for activity intensity relativity

Objective: To examine children’s energy expenditure (EE) during object projection skill performance at three intensity intervals. Methods: Children’s (42, Mage = 8.1) average metabolic equivalents of task (METs) were calculated using a COSMED K4b2 while they repeatedly performed blocks of kicking, throwing (overhand), and striking (two-handed) during 6, 12, and 30-s interval conditions. A repeated-measures analysis of covariance examined differences in METs while controlling for skill level. Results: Data indicated a main effect for interval condition (df = 2, 123, F = 94.36, p <.001, η2 = .605). Post hoc t-tests demonstrated decreasing performance interval times yielded progressively higher METs (p <.001) across the three conditions (30s = 4.5±0.8 METs, 12s = 6.3±1.3, 6s = 8.3±1.6). There also was a main effect for sex (df = 1,120, F = 52.28, p <.001 η2 = .305). Boys demonstrated higher METs at each performance interval (p <.001). Conclusion: Skill practice with a maximum of one trial every 30s resulted in the equivalent of at least moderate physical activity (>4.0 METs) and intervals of 6s demonstrated vigorous physical activity (>7.0 METs). Practicing/performing object projection skills, even at intervals that allow for adequate instruction and feedback (i.e., 1 trial/30s), promotes MVPA in children.     

Predicting the Use of Campus Counseling Services for Asian/Pacific Islander,Latino/Hispanic,and White Students: Problem Severity,Gender, and Generational Status

The purpose of the current study was to identify predictors of counseling center use among Asian/Pacific Islander, Latino/Hispanic, and White college students. Findings indicated that female and 2nd‐generation students report the most severe difficulties. Problem severity and gender predicted counseling center use for White and Asian/Pacific Islander students, whereas only problem severity predicted use for Latino/Hispanic students. Generational status was not a significant predictor of use for any group.     

Social and Environmental Factors Associated With Preschoolers' Nonsedentary Physical Activity

The twofold purposes of the investigation were (a) to describe with direct observation data the physical activity behaviors and the accompanying social and environmental events of those behaviors for children in preschools and (b) to determine which contextual conditions were predictors of moderate to vigorous physical activity (MVPA) and nonsedentary physical activity (i.e., light activity + MVPA) for 3-, 4-, and 5-year-old children during their outdoor play. The results indicate that preschoolers' physical activity is characterized as sedentary in nature throughout their preschool day (i.e., 89% sedentary, 8% light activity, and 3% MVPA). During outdoor play periods, when children are most likely to be physically active, some contextual and social circumstances better predict their physical activity. Implications for policy makers, practitioners, and researchers are discussed.     

学龄前儿童体力活动研究的十大问题

摘要：目的是回顾与3-5岁儿童体力活动有关的重要研究问题。本文将从三个主要研究领域进行分析：健康效果、体力活动模式、干预和政策。研究的首要问题包括：确定体力活动的健康效果,确定体力活动对保持健康体重的影响,探明体力活动对学习和行为习惯的影响,以及静坐行为对健康的影响。与体力活动模式相关的研究问题包括,3-5岁儿童满足现有体力活动推荐量的情况;影响体力活动的社会和环境因素,包括家庭、幼儿园、社区环境;体力活动如何对学龄儿童期、青少年时期和成年以后产生影响。关于干预和政策方面的研究问题包括,确定在家庭、保育机构、社区环境最有效的促进体力活动的干预策略,以及不同幼儿适用的干预方案,确定有效的干预手段和宣传策略,制定有效的能够增加幼儿体力活动水平的国家、州、地方和机构的政策。总之,全面的了解体力活动对3-5岁儿童健康的影响,以便于掌握该群体的体力活动特点,探索如何促进幼儿的体力活动。