Physical activity in the lifestyle of Czech university students: Meeting health recommendations     

《European Journal of Sport Science》2013,13(6):744-750

Abstract

The decline of physical activity (PA) in adults as well as children and youth is a worldwide phenomenon. The aim of this study is to analyse the amount of PA in Czech university students' daily lives. The research on university students was conducted as part of nationwide research on PA in the adult population of the Czech Republic. A total of 906 students at eight selected universities were asked to participate in this study. The response rate was 79.5%. We analysed data from 641 university students: 318 male [mean age 21.63±1.73; mean Body Mass Index (BMI) 23.50±1.91] and 323 female (mean age 21.08±1.53; mean BMI 21.23±2.20). The students wore Yamax SW-701 pedometers continuously for seven days. With respect to BMI, the recommendation of 10,000 steps per day on an average day was met by 76% of men and 68% of women of normal weight, 67% of male students who were overweight or obese and 85% of female students who were overweight or obese. Of all monitored days, in both females and males, the number of steps taken on Sunday was significantly lower (p<0.0001) in comparison to other days of a week. No significant differences were found in the number of steps taken among students of normal weight, students who were overweight and students who were obese on any of the monitored days. The majority of Czech male university students are of normal weight. Only 9% of students meet the criterion of 10,000 steps every day. Approximately two-thirds of students meet the 10,000 steps daily criterion on four or more days per week. The lowest number of steps is taken on Sundays; this finding supports the need for intervention programmes to enhance PA on weekends.  相似文献   

金砖国家对外贸易隐含碳的测算与比较——基于投入产出模型和结构分解的实证分析     

江洪 《资源科学》2016,38(12):2326-2337

为了探索金砖国家在不同双边贸易中是否存在碳减排的国际贸易途径,采用金砖四国1995年、2000年、2005年和2011年投入产出表,将经济分为11个部门,构建投入产出模型,测算了金砖国家对外贸易隐含碳,并进行行业结构分解分析。研究结果表明：俄罗斯从1995-2011年,一直处于进出口贸易隐含碳净顺差国,而且样本期内净顺差规模逐年扩大,已经沦为“污染天堂”;中国进出口贸易隐含碳绝对数逐年增加,行业贸易隐含碳特征有明显差异,金属制品、橡胶、纺织等行业处于贸易顺差且顺差规模不断扩大,而采矿业长期处于逆差,从2000年以后成为进出口贸易隐含碳净顺差国,正逐渐沦为“污染天堂”;巴西贸易隐含碳处于基本平衡状态,不属于“污染天堂”;一直处于进出口贸易隐含碳净逆差,且逆差规模逐年扩大,说明印度不仅没有沦为“污染天堂”,相反,正不断从对外贸易中获益。金砖四国隐含碳行业结构分解结果基本趋同,一直处于进出口贸易隐含碳净逆差,且逆差规模逐年扩大,说明印度规模效应是隐含碳排放的主要驱动因素;结构效应对隐含碳排放有促进作用,但不显著;技术效应对隐含碳排放有抑制作用。  相似文献   

反抗与认同——比较《伤逝》与《相爱的日子》     

何慧 《沙洋师范高等专科学校学报》2009,10(1):33-36

鲁迅的《伤逝》和毕飞宇的《相爱的日子》都是描写时代青年恋爱生活的优秀短篇小说,它们具有相同的情节模式,揭示的问题也具有相似性,不同的是,前者意在反抗绝望,后者则是认同现实。  相似文献   

牡丹江境内沿江污染状况及治理对策     

吕明明  齐雪莹  于磊 《黑龙江科技信息》2009,(12):163-163

通过对牡丹江境内沿岸自然状况的详细调查,提出了有针对性的生态治理建议,对恢复自然生态,保护好牡丹江流域环境有重要意义。  相似文献   

原油稳定装置污染源分析与控制     

王晓娜 《黑龙江科技信息》2009,(36):8-8

通过对大庆某采油厂原油稳定装置污水、大气、噪音和废弃垃圾污染的种类,分析了其主要来源,提出了如何控制、减少污染物的建议。  相似文献   

对我国环境税制及其配套政策设计的思考     

《重庆师专学报》2009,(5):47-50

利用环境税来解决环境污染问题已被发达国家的经验证明是一种有效的方法,文章客观地分析了我国现行环境税费存在的问题,适时提出了环境税制以及配套措施的设计方案。  相似文献   

基于MFF₃₀方法的城市降雨径流初期冲刷效应     

李琪  张娜  罗英杰  王昕  景永才 《中国科学院大学学报》2019,36(5):650-662

合理判别降雨径流的初期冲刷效应,并研究初期冲刷效应的冲刷强度和影响因素,对城市雨洪管理和海绵城市建设具有重要意义。提出污染物初期冲刷率（MFF₃₀）（当产生前30%的地表径流时,累积污染负荷比例与累积径流比例的比值）的5级分类标准。通过测定北京地区不同量级的降雨事件中不同特征子汇水小区的地表径流及其水质,分析影响TSS、COD和TN这3种污染物冲刷强度的降雨和下垫面因素。结果表明,MFF₃₀的5级分类标准可用于准确地定量判别和比较初期冲刷效应。在其他降雨或下垫面条件近似的情况下,前期干燥天数、雨强的动态变化、子汇水小区的漫流宽度和坡度,和交通流量对初期冲刷效应有很大影响。  相似文献   

Effects of consecutive days of match play on technical performance in tennis     

Danielle T. Gescheit  Rob Duffield  Melissa Skein  Neil Brydon  Stuart J. Cormack  Machar Reid 《Journal of sports sciences》2017,35(20):1988-1994

Elite tennis is characterised by repeated bouts of up to 5-set match play, yet little is known about the technical requirements of shots played. This study therefore investigated technical performance changes over consecutive days of prolonged, simulated tennis match play. A total of 7 well-trained men tennis players performed 4 consecutive days of competitive 4-h match play. Matches were notated to determine between-day changes in groundstroke and serve performance, as well as point and match durations. Changes ≥75% likely to exceed the smallest important effect size (0.2) were considered meaningful and represented as effect size ± 90% confidence interval. Effective playing time reduced on days 3 and 4, alongside likely increases in “stretch” groundstrokes over the 4 days (mean effect size ± 90% confidence interval; 0.57 ± 0.38) and “stretch” backhand returns on days 2 and 3 (0.39 ± 0.54 and 0.67 ± 0.55). Relative unforced errors increased on day 4 (vs. day 2; 0.36 ± 0.22) and second-serve winning percentage reduced after day 1 (?0.47 ± 0.50). Further, a likely increase in emotional outbursts characterised day 3 (vs. day 2; 0.73 ± 0.57). Consecutive-day match play impairs hitting accuracy, stroke positioning and emotional responses; an understanding of which prepares players for elite-standard tennis tournament play.  相似文献   

青藏高原地面站春季积雪日数的时空演变特征   总被引：3，自引：1，他引：2  

胡豪然  彭骏  毛晓亮 《资源科学》2010,32(1):149-156

利用高原地区1962年-2004年64个地面站积雪资料,揭示了该地区春季积雪日数的时空演变特征,结果表明:①高原地区春季积雪日数空间分布局地差异显著,多雪区集中在巴颜喀拉山东段和藏北高原东南部,少雪区主要是藏南谷地、柴达木盆地以及川西干暖河谷地带;②空间分布可以概括为6种类型,青南高原东部型、藏北高原东部型、川西高原南部型、青藏高原东北部型、西藏东北部型以及川西高原东部型;③青南高原东部的春季积雪日数呈显著增长趋势,青藏高原东北部呈减少趋势,川西高原南部基本没有趋势变化,其余分区内各测站的线性变化趋势不完全一致,春季积雪日数仅在青南高原和川西高原东部地区存在由少变多的显著年代际变化,分别出现在1975年和1982年前后;④高原地区的春季积雪日数主要以准2年、准6年以及准10年的周期振荡为主。  相似文献   

植物与大气污染   总被引：2，自引：0，他引：2  

周速  石泉花 《新乡教育学院学报》2003,16(4):77-78

大气污染对植物的危害影响和症状,及植物对大气污染的抗性和监测、指示作用。  相似文献