Effects of coffee and caffeine anhydrous on strength and sprint performance     

Eric T. Trexler  Erica J. Roelofs  Katie R. Hirsch  Meredith G. Mock 《European Journal of Sport Science》2016,16(6):702-710

Caffeine and coffee are widely used among active individuals to enhance performance. The purpose of the current study was to compare the effects of acute coffee (COF) and caffeine anhydrous (CAF) intake on strength and sprint performance. Fifty-four resistance-trained males completed strength testing, consisting of one-rep max (1RM) and repetitions to fatigue (RTF) at 80% of 1RM for leg press (LP) and bench press (BP). Participants then completed five, 10-second cycle ergometer sprints separated by one minute of rest. Peak power (PP) and total work (TW) were recorded for each sprint. At least 48 hours later, participants returned and ingested a beverage containing CAF (300?mg flat dose; yielding 3–5?mg/kg bodyweight), COF (8.9?g; 303?mg caffeine), or placebo (PLA; 3.8?g non-caloric flavouring) 30 minutes before testing. LP 1RM was improved more by COF than CAF (p?=?.04), but not PLA (p?=?.99). Significant interactions were not observed for BP 1RM, BP RTF, or LP RTF (p?>?.05). There were no sprint?×?treatment interactions for PP or TW (p?>?.05). 95% confidence intervals revealed a significant improvement in sprint 1 TW for CAF, but not COF or PLA. For PLA, significant reductions were observed in sprint 4 PP, sprint 2 TW, sprint 4 TW, and average TW; significant reductions were not observed with CAF or COF. Neither COF nor CAF improved strength outcomes more than PLA, while both groups attenuated sprint power reductions to a similar degree. Coffee and caffeine anhydrous may be considered suitable pre-exercise caffeine sources for high-intensity exercise.  相似文献   

Differential predictors of achievement among Kibbutz and urban high school students     

Amos Tal 《Interchange》1982,13(1):83-91

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Reviews     

David H. Hirsch  Sanford Pinsker  Barry R. Gross 《Academic Questions》1995,9(1):75-85

Sam Pickering teaches English at the University of Connecticut  相似文献   

An examination of the interactions between museum educators and students on a school visit to science museum     

Neta Shaby  Orit Ben-Zvi Assaraf  Tali Tal 《科学教学研究杂志》2019,56(2):211-239

Today, science is a major part of western culture. Discussions about the need for members of the public to access and understand scientific information are therefore well established, citing the importance of such information to responsible citizenship, democracy, socially accountable scientific research and public funding (National Research Council [2009] Learning science in informal environments: People, places, and pursuits. National Academies Press). In recent years there has been an increased interest in investigating not just what visitors to informal environments have learnt after a visit, but also how visitors interact and engage with exhibits during the visit (Davidsson & Jakobsson [2012] Understanding interactions at science centers and museums: Approaching sociocultural perspectives. Rotterdam: Sense Publishers). Within the field of school visits to science museums, however, interactions between students and museum educators (MEs) remain relatively unexplored. In our study of such school visits, we are mainly interested in the interactions that take place between three agents—the students, the museum educator and the physical setting of the exhibit. Using moment-to-moment fine grain analysis of multiple interactions allowed us to identify recurring patterns between students and the museum educators around exhibits, and to examine the MEs’ mediational role during the interactions, and the practices they employ to engage students with exhibits. Our study revealed that most interactions between MEs and students consist of technical explanations of how to operate the exhibits. The interactions that do move past this stage often include two main practices, which the MEs use to promote students’ engagement with the exhibits: physical instruction and engaging the students emotionally. Understanding what is actually happening in the learning process that occurs during students’ interactions with exhibits can help museum educators and exhibit designers improve the experiences of students on school visits.  相似文献   

Let the Germans Win? Israeli Attitudes towards Die Mannschaft during The 2014 World Cup Tournament     

Tal Samuel-Azran  Yair Galily  Yuval Karniel  Amit Lavie-Dinur 《Journal of Intercultural Communication Research》2016,45(5):391-403

To contribute to analyses of the sport-politics nexus, the study examines Jewish-Israeli attitudes toward the German soccer team and Germany. The analysis reveals that more Israelis root against the German soccer team than support it, despite the team’s impressive achievements. The analysis of attitudes toward Germany surprisingly reveals that the 18–20 age group expressed the strongest animosity towards Germany, which may indicate that Israeli government attempts to instill the Holocaust memory in the young generations perpetuates animosity between young Israelis and Germany. The study strengthens the notion that international sport games represent and extend rather than reduce international tensions.  相似文献   

Postmodernism,hellenism, and hebraism     

David H. Hirsch 《Academic Questions》1996,9(3):68-77

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A response to harvey Graff and brian hendley     

E. D. Hirsch Jr. 《Interchange》1989,20(1):61-64

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Developmental word deafness and speech therapy     

Katherine de Hirsch L. C. S. T. 《Annals of dyslexia》1956,6(1):50-57

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Remembering lauretta bender     

Regina Cicci  Katrina de Hirsch  Ralph D. Rabinovitch  Roger Saunders  Rosa A. Hagin  Archie A. Silver  Alvin E. Grugett 《Annals of dyslexia》1987,37(1):1-9

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Early prediction of reading failure     

Katrina de Hirsch  Jeanette J. Jansky  William S. Langford 《Annals of dyslexia》1966,16(1):1-13

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