大学生心理应激水平与体质关系研究

本文采用实验研究、问卷调查以及数理统计等方法,从学习、生活、发展、社交和家庭等五个方面分析不同体质条件下大学生心理应激水平的差异,为更好地促进大学体育开展,促进大学生身心健康发展提供依据.     

产业集聚对出口贸易的影响研究——基于湖南省冶金及金属制品产业的实证分析

产业集聚作为一种空间地理特征,对于一国或地区的对外贸易与经济增长具有重要影响。以湖南省冶金及金属制品产业出口贸易与产业集聚的状况为例,实证分析产业集聚对出口贸易的影响,研究结果表明,从长期来看,湖南省冶金及金属制品产业出口贸易与产业集聚之间存在着长期稳定的关系,产业集聚有效促进了出口贸易的增长,且集聚规模每增长1%,出口规模增长0.41%。     

晋商在恰克图市场上居于垄断地位的经济学分析

恰克图贸易是明清时期晋商的经营活动中为数不多的对外贸易之一,晋商从事恰克图贸易的动机是为了获取利润。晋商垄断地位形成的原因：茶的不可替代性是自然原因;政府特许是制度原因;规模经济是晋帮茶商垄断地位形成的经济基础。     

全球化条件下河南服务业发展方向的选择

河南与全球经济发展的密切程度不断加强,加强对外经济合作是今后发展的必由之路。然而河南人力资源的状况不尽如人意,在这样的条件下如何参与国际合作和竞争,是当前河南服务业对外开放的实际问题。河南应以比较优势为基础选择服务业的开放视角,避免陷入误区,把农业服务业作为对外开放重点发展的服务行业。     

健身秧歌对60～65岁老年女性体质的影响

选取30名自愿参加健身秧歌锻炼且没有参加其它锻炼形式的60～65岁老年女性作为实验组,并随机选取27名同年龄段没有参与任何形式健身锻炼的老年女性作为对照组．运用实验法经过20周系统的健身秧歌锻炼,对实验前后两组人群体质状况进行比较研究,探讨健身秧歌锻炼对老年人体质的影响,从而为广大老年女性参加健身秧歌运动提供一定的参考．     

美国次贷危机对珠三角企业的影响及对策

从出口贸易对珠三角的重要性着手,分析金融危机影响下,珠三角企业的现状及其当前困难原因,探讨美国次贷危机对中国的出口经济的影响从而进一步分析美国次贷危机的特点和对珠三角经济的影响,最后提出珠三角企业为应对次贷危机而作出的四个相关策略,即积极开拓多元化的海外市场,加快外贸转移;加强企业研发与自己创新的产品品质与性能,提高附加值,高技术产品占出口商品的比重;建立企业信用风险管理机制;变被动为主动、变危机为机遇,进一步增强大型装备的制造水平与能力。     

海峡两岸贸易结算问题研究

海峡两岸贸易结算得到了很大的发展,但还滞后于两岸经贸合作的进程.目前还存在两岸货币兑换局限、直接通汇仍不通畅、清算机制亟待建立、两岸金融机构互设障碍等问题,制约着两岸经贸关系的进一步深入发展.在两岸签署MOU、ECFA等协议的背景下,两岸应改进两岸货币兑换与汇率形成机制,建立以两岸货币为基础的结算清算系统,采取多种优惠...     

Health-related fitness knowledge growth in middle school years: Individual- and school-level correlates

BackgroundHealth-related fitness knowledge (HRFK) has been an essential concept for many health and physical education programs. There has been limited understanding and longitudinal investigation on HRFK growth. This longitudinal study examined HRFK growth and its individual- and school-level correlates in middle school years under 1 curriculum condition: Five for Life.MethodsParticipants were 12,044 students from 47 middle schools. Data were collected at both individual/participant and school/institution levels. Individual-level variables included gender, grade, and HRFK test scores. School-level variables included percentage of students receiving free and reduced meals (FARM), student-to-faculty ratio for physical education, and school academic performance (SAP). We used hierarchical linear modeling to examine HRFK 3-year growth in relation to individual- and school-level correlates.ResultsThe average HRFK score at 6th grade for females was 42.81% ± 1.32%. The predicted HRFK growth was 17.06% ± 1.02% per year, holding other factors constant. A 1-standard deviation increase in FARM correlated with a 14.68%-point decrease in predicted test score (p = 0.02). A 1-standard deviation increase in SAP was associated with an 11.90%-point increase in HRFK score. Males had a significantly lower growth rate than females during the middle school years (0.78%/year, p = 0.02).ConclusionThe result showed that both individual- and school-level variables such as gender, FARM, and SAP influenced HRFK growth. Educators should heed gender differences in growth curves and recognize the correlates of school-level variables.     

Responses to oral glucose challenge differ by physical activity volume and intensity: A pilot study

BackgroundOne-hour postprandial hyperglycemia is associated with increased risk of type 2 diabetes and cardiovascular disease. Physical activity (PA) has short-term beneficial effects on post-meal glucose response. This study compared the oral glucose tolerance test results of 3 groups of people with habitually different levels of PA.MethodsThirty-one adults without diabetes (age 25.9 ± 6.6 years; body mass index 23.8 ± 3.8 kg/m²; mean ± SD) were recruited and divided into 3 groups based on self-reported PA volume and intensity: low activity < 30 min/day of moderate-intensity activity (n = 11), moderately active ≥ 30 min/day of moderate-intensity PA (n = 10), and very active ≥ 60 min/day of PA at high intensity (n = 10). Participants completed an oral glucose tolerance test (50 g glucose) with capillary blood samples obtained at baseline, 15 min, 30 min, 45 min, 60 min, 90 min, and 120 min post-ingestion.ResultsThere were no significant differences between groups for age or body fat percentage or glycated hemoglobin (p > 0.05). The groups were significantly different in terms of baseline glucose level (p = 0.003) and, marginally, for gender (p = 0.053) and BMI (p = 0.050). There was a statistically significant effect of PA on the 1-h postprandial glucose results (p = 0.029), with differences between very active and low activity groups (p = 0.008) but not between the moderately active and low activity groups (p = 0.360), even when baseline glucose level and gender differences were accounted for. For incremental area under the curve there was no significant effect of activity group once gender and body fat percentage had been accounted for (p = 0.401). Those in the low activity group took 15 min longer to reach peak glucose level than those in the very active group (p = 0.012).ConclusionThe results suggest that high levels of PA have a beneficial effect on postprandial blood glucose profiles when compared to low and moderate levels of activity.     

振动训练对运动员身体素质的影响

目的:振动训练是一种新兴的的训练方式,现阶段已经得到了较为广泛的应用。本文主要通过对现有振动训练研究进行总结概括,旨在探讨振动训练对运动员身体素质的影响。方法:主要采用文献资料法,通过知网、万方、维普等中文期刊数据库检索查阅前人实验研究文献,并对其结论进行总结归纳。结论:通过振动训练可以促进肌肉力量的增长以及肌肉爆发力的增长,对力量素质发展有积极的促进作用;振动训练可以有效提高运动员肌肉爆发力,对速度素质发展有促进作用;振动训练可以增强心肺功能以及肌肉耐力水平,可提高运动员的耐力素质;振动训练可以提高肌肉及韧带的伸展性对运动员柔韧素质发展有着较好的影响,有学者认为振动训练对柔韧素质没有影响。