Carol G. Jenkins, Medical Library Association President 2001-2002     

Marshall JG 《Bulletin of the Medical Library Association》2001,89(3):311-314

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Lunge performance and its determinants     

Cronin J  McNair PJ  Marshall RN 《Journal of sports sciences》2003,21(1):49-57

For activities such as squash, badminton and fencing, the ability to quickly complete a lunge and return to the start or move off in another direction is critical for success. Determining which strength qualities are important predictors of lunge performance was the focus of this study. Thirty-one male athletes performed: (1) a unilateral maximal squat (one-repetition maximum, 1-RM) and unilateral jump squat (50% 1-RM) on an instrumented supine squat machine, and (2) a forward lunge while attached to a linear transducer. We performed stepwise multiple regression analysis with lunge performance as the dependent variable and various strength, flexibility and anthropometric measures as the independent variables. From the many strength and power measures calculated, time to peak force was the best single predictor of lunge performance, which accounted for 55% of the explained variance. The best three-variable model for predicting lunge performance accounted for 76-85% of the explained variance. The models differed, however, according to whether lunge performance was expressed relative to body mass (time to peak force, mean power and relative strength = 76%) or taken as an absolute value (time to peak force, leg length and flexibility = 85%). We conclude that one to two trials were reliable for strength diagnosis and that one strength measure cannot accurately explain functional performance because other factors, such as body mass, flexibility and leg length, have diverse effects on the statistical models.  相似文献   

Student activity levels, lesson context, and teacher behavior during middle school physical education     

McKenzie TL  Marshall SJ  Sallis JF  Conway TL 《Research quarterly for exercise and sport》2000,71(3):249-259

There is little research on students' engagement in physical activity in middle school physical education (PE). We observed student activity, lesson context, and teacher behavior in 430 PE lessons taught by 126 teachers in 24 schools. Variables were analyzed by mixed-model nested analyses of covariance. Boys were more active than girls overall and during skill drills, game play, and free play. Student activity varied by lesson context, with fitness activities producing the most activity. Class size was negatively associated with student activity. Daily PE contributed a weekly total of 25 min of vigorous activity and 83 min of moderate-to-vigorous activity--much less than national objectives. Results suggest that numerous opportunities exist for increasing student physical activity during middle school PE.  相似文献   

“Back to Basics: Back to Boredom?”     

John Marshall Carter 《Clearing house (Menasha, Wis.)》2013,86(3)

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生死相拥5000年     

贾庆文 《海外英语》2007,(4):46-47

[1](路透社)意大利瓦尔达罗电——意大利将不会分离它石器时代的“情侣”。[2]科学家说他们决定把这对相拥5000年之久的情侣遗体整体移动并保存,作为献给全国的情人节礼物,在他们永远拥抱的姿势中,他们的胳膊仍然相互缠绕在一起。  相似文献   

COLLECTING DUPLICATES: DONATIONS ACCEPTANCE SYSTEM     

Marshall ML 《Bulletin of the Medical Library Association》1933,22(1):39-41

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Atoms,stars and nebuleæ: by Leo Goldberg and Lawrence H. Aller. (The Harvard Books on Astronomy.) 323 pages, 150 illustrations. Philadelphia,The Blakiston Company, 1943. Price $2.50     

Roy K. Marshall 《Journal of The Franklin Institute》1943,236(1):101

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REPORT OF THE EXECUTIVE COMMITTEE September 1, 1928     

Ballard JF  Marshall ML  Whitman FN 《Bulletin of the Medical Library Association》1928,17(4):65-69

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Literacy research and the uses of history: Studying literacy, schooling and young people in new times     

Phil Cormack 《The Australian Educational Researcher》1998,25(3):23-36

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The construction division of the army     

R.C. Marshall 《Journal of The Franklin Institute》1920,189(5):581-601

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