Changes in running economy following downhill running

In this study, we examined the time course of changes in running economy following a 30-min downhill (-15%) run at 70% peak aerobic power (VO2peak). Ten young men performed level running at 65, 75, and 85% VO2peak (5 min for each intensity) before, immediately after, and 1 - 5 days after the downhill run, at which times oxygen consumption (VO2), minute ventilation, the respiratory exchange ratio (RER), heart rate, ratings of perceived exertion (RPE), and blood lactate concentration were measured. Stride length, stride frequency, and range of motion of the ankle, knee, and hip joints during the level runs were analysed using high-speed (120-Hz) video images. Downhill running induced reductions (7 - 21%, P < 0.05) in maximal isometric strength of the knee extensors, three- to six-fold increases in plasma creatine kinase activity and myoglobin concentration, and muscle soreness for 4 days after the downhill run. Oxygen consumption increased (4 - 7%, P < 0.05) immediately to 3 days after downhill running. There were also increases (P < 0.05) in heart rate, minute ventilation, RER, RPE, blood lactate concentration, and stride frequency, as well as reductions in stride length and range of motion of the ankle and knee. The results suggest that changes in running form and compromised muscle function due to muscle damage contribute to the reduction in running economy for 3 days after downhill running.     

湖北省体育系统所属体育场地现状分析

通过对湖北省体育系统所属体育场地设施现状的调查研究,进一步分析了体育系统所属的体育场地的建设、管理和运营现状,并在此基础上提出了一些建议,以期为相关决策部门提供参考依据。     

重庆市独立设置成人高校继续教育发展现状、问题与对策研究

本文通过对重庆市10所独立设置成人高校发展现状的调研,对重庆市独立设置成人高校发展过程中存在的问题进行了剖析,并进一步提出了发展对策和建议。     

一封意味深长的道别信

正外籍教师伊凡坚持6年在温州大罗山捡垃圾,获选"感动温州的十大人物"之一。近日他返回澳大利亚老家,临行前留下了——温州大学瓯江学院的外教伊凡·戴维斯在过去6年里,每周六去瓯海区的大罗山捡垃圾,是市民眼中的"环保卫士""捡垃圾的洋雷锋"。2013年,他获选"感动温州十大人物"之一(本刊2015年第10期作过报道)。日前,伊凡返回澳大利亚老家。离开温州前,他给本文作者之一徐齐发了一封     

有氧运动对慢性应激大鼠脑海马区神经可塑性的影响

摘要：目的：以神经元和神经胶质细胞相关神经生物学变化为切入点,探讨有氧运动对慢性应激大鼠脑海马区神经可塑性的影响。方法：以SD大鼠为研究对象,按照体重均衡分为对照组（CON）、慢性应激模型组（MOD）、氟西汀组（FLU）、低强度运动组（LIR）和中等强度运动组（MIR）。给予大鼠4周慢性应激,并分别伴随氟西汀给药、低强度或者中等强度的运动干预。4周后,通过开场实验、蔗糖饮水实验、新奇抑制摄食实验以及新物体识别实验检测运动对慢性应激大鼠抑郁样行为、焦虑样行为以及认知障碍的影响;同时,利用酶联免疫法和蛋白免疫印迹法,检测运动对慢性应激大鼠血清皮质酮、海马内前炎因子IL1-β,以及蛋白GFAP、S100β、BDNF、p-ERK、p-CREB表达的影响,探讨运动抗抑郁的行为学效应和作用机制。结果：1）低强度和中等强度运动能够显著增加慢性应激大鼠的开场活动、缩短新奇抑制摄食潜伏期,同时提高慢性应激大鼠新物体的识别指数;2）运动有效逆转了慢性应激大鼠血清皮质酮的异常升高,同时降低海马内前炎性因子IL1-β的分泌;3）运动可显著星形胶质细胞的标志性功能蛋白GFAP和S100β的表达水平,增强慢性应激大鼠的BDNF/ERK/CREB信号转导通路中重要蛋白BDNF、p-ERK、p-CREB的表达。结论：运动可以通过提高慢性应激大鼠脑海马区神经可塑性来达到抗抑郁的目的。可能与以下因素有关：1）运动调节血清皮质酮的异常升高,降低海马内前炎性因子的释放,同时,提高与神经胶质细胞相关蛋白GFAP和S100β活性,从而起到神经元保护的作用;2）运动可以通过激活CREB,BDNF以及ERK等重要信号蛋白的表达,提高神经营养作用,促进神经元的生长,增加神经可塑性和神经发生来发挥抗抑郁作用。     

小黑药种子萌发繁殖研究

通过光照、土壤、温度三因素两水平L8(27)正交试验,得到小黑药田间种子发芽率25%-100%;光照不是种子萌发的必需条件;小黑药喜半荫和排水良好生境,喜聚群分布;山基土+低温环境是种子萌发的适宜环境组合;春季或初夏采用山基土,穴播,间距2-5 cm是小黑药较好的繁殖方式.     

Innovation and Challenges Wuyutai^s Venture into Online Business简

Lasting two days, the 2014 Wuyutai Franchisee Meeting drew to a close. Present at the meeting were about 300 franchisee representatives of more than 300 stores from Beijing, Gansu, Hebei, Henan, Heilongjiang,     

Wuyutai＇s Tea Moon Cakes

From a single centennial shop to over 300 chains studding northern China and radiating nationwide, the past fifteen years witnessed Wuyutai＇s rapid development and grand achievements, its shared journey with alliance businesses and its efforts to deepen and widen tea market, Whenever and wherever, first-class products and services are essential to success. Looking into the future,     

“后世博”的文化交流依然精彩

“后世博”时期的文化交流从世博会的舞台跃入更广阔的空间,多元文化全面交融,相谐相生,相得益彰,交流合作与中外友谊恒久长存,环保、科技创新可持续发展,这将引领中国与时代共进,与世界同行。     

“海女”：大海骄傲的女儿——梁平波、张华胜、张谷良、张卫民惠安采风作品展侧记

这是歌曲《惠安之春》的一段歌词。画面中小城的春天,干净、平和、悠然、秀美的山水让人向往,无数的故事引人走读。