The relationship between peak height velocity and physical performance in youth soccer players   总被引：1，自引：1，他引：0  

Philippaerts RM  Vaeyens R  Janssens M  Van Renterghem B  Matthys D  Craen R  Bourgois J  Vrijens J  Beunen G  Malina RM 《Journal of sports sciences》2006,24(3):221-230

Longitudinal changes in height, weight and physical performance were studied in 33 Flemish male youth soccer players from the Ghent Youth Soccer Project. The players' ages at the start of the study ranged from 10.4 to 13.7 years, with a mean age of 12.2 +/- 0.7 years. Longitudinal changes were studied over a 5 year period. Peak height velocity and peak weight velocity were determined using non-smoothed polynomials. The estimations of peak height velocity, peak weight velocity and age at peak height velocity were 9.7 +/- 1.5 cm x year-1, 8.4 +/- 3.0 kg x year-1 and 13.8 +/- 0.8 years, respectively. Peak weight velocity occurred, on average, at the same age as peak height velocity. Balance, speed of limb movement, trunk strength, upper-body muscular endurance, explosive strength, running speed and agility, cardiorespiratory endurance and anaerobic capacity showed peak development at peak height velocity. A plateau in the velocity curves was observed after peak height velocity for upper-body muscular endurance, explosive strength and running speed. Flexibility exhibited peak development during the tear after peak height velocity. Trainers and coaches should be aware of the individual characteristics of the adolescent growth spurt and the training load should also be individualized at this time.  相似文献   

Puberty and physical self-perceptions of competitive female figure skaters: an interdisciplinary approach   总被引：1，自引：0，他引：1  

Monsma EV  Malina RM  Feltz DL 《Research quarterly for exercise and sport》2006,77(2):158-166

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Preface     

Zhe Chen  & Robert S. Siegler 《Monographs of the Society for Research in Child Development》2000,65(2):vii-vii

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The state and the academic library: edited by Vicki L. Gregory. Westport, CT: Greenwood Press, 1993. 196p. $55.00. ISBN 0-313-28108-4. ISSN: 0084-9243. LC 93-130013. Permanent paper     

Robert Dugan  Associate Librarian 《The Journal of Academic Librarianship》1994,20(5-6)

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Chaos theory, informational needs, and natural disasters   总被引：2，自引：0，他引：2  

Timothy L. Sellnow  Matthew W. Seeger  Robert R. Ulmer 《Journal of Applied Communication Research》2002,30(4):269-292

This study applies chaos theory to a system-wide analysis of crisis communication in a natural disaster. Specifically, we analyze crisis communication during the 1997 Red River Valley flood in Minnesota and North Dakota. This flood, among the worst in modern American history, consumed entire metropolitan areas, displacing thousands of people. The conditions and decisions leading to the disaster, and the subsequent reactions are retraced. Communication related to river crest predictions (fractals), the shock at the magnitude of the crisis (cosmology episode), novel forms of reorganizing (self-organization), and agencies that aided in establishing a renewed order (strange attractors) are evaluated. Ultimately, we argue that preexisting sensemaking structures favoring rationalized, traditional views of a complex system led officials to make inappropriately unequivocal predictions and ultimately diminished the effectiveness of the region's crisis communication and planning.  相似文献   

PUBLIC AND ELITE ATTITUDES TO ENVIRONMENTAL ISSUES   总被引：1，自引：0，他引：1  

Worcester  Robert M. 《Int. Journal of Public Opinion Research》1993,5(4):315-334

This paper puts the environment into perspective. Politiciansand commentators see the environment as yesterday's issue, forgettingthat the core of environmental activists is still double thelevel of just five years ago. International comparisons stretchingfrom Poland to New Zealand are made, examining the public'senvironmental behavior, attitudes and values. Using Great Britainas a case study, detailed comparisons are made between the attitudesof the general public with journalists, the financial community,captains of industry, and Members of Parliament and the latterthen compared with Members of the European Parliament. The publicis demanding action by companies and by governments on environmentalissues and has little faith in either to take corrective action.  相似文献   

Reading the congressional record on CD-ROM : By the Superintendent of Documents, U.S. Government Printing Office. Washington, DC: GPO, 1992. SuDoc: GP 3.2C 76/2.     

Robert E. Dugan 《Government Information Quarterly》1993,10(4)

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“Hypnotizzy” in the Cold War: The American Fascination with Hypnotism in the 1950s     

Robert Genter 《Journal of American culture (Malden, Mass. : 2003)》2006,29(2):154-169

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E‐learning in Tertiary Education: Where do we stand? Centre for Educational Research and Innovation     

Robin Mason 《Higher Education Quarterly》2006,60(3):287-289

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Administrative advisory committees at the University of California at Davis     

Robert Sommer 《Minerva》1992,30(1):1-13

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