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141.
Nicholas P Linthorne Maurice S Guzman Lisa A Bridgett 《Journal of sports sciences》2013,31(7):703-712
In this study, we found that the optimum take-off angle for a long jumper may be predicted by combining the equation for the range of a projectile in free flight with the measured relations between take-off speed, take-off height and take-off angle for the athlete. The prediction method was evaluated using video measurements of three experienced male long jumpers who performed maximum-effort jumps over a wide range of take-off angles. To produce low take-off angles the athletes used a long and fast run-up, whereas higher take-off angles were produced using a progressively shorter and slower run-up. For all three athletes, the take-off speed decreased and the take-off height increased as the athlete jumped with a higher take-off angle. The calculated optimum take-off angles were in good agreement with the athletes' competition take-off angles. 相似文献
142.
Maurice Jetté Roger Gauthier Jean Mongeon 《Research quarterly for exercise and sport》2013,84(3):396-403
The purpose of the study was to develop a simple field procedure for estimating ideal body weight. The statistical relationship between weight loss and girth measurements was analyzed in 40 male subjects. It was established that a decrease in total body weight was highly correlated (r = .842) with a decrease in abdominal girth while chest girth remained relatively stable. A regression equation was formulated to predict weight loss necessary to achieve ideal body weight corresponding to 15% of body fat or less on the basis of the chest abdominal girth relationship. The equation was as follows: (kg to lose) = .457 + .758 (Δ cm) where Δ cm are the missing centimeters required to achieve a positive difference of 12 cm between the chest and abdominal girths. The equation was employed on 40 other male subjects whose body density had been determined earlier by the hydrostatic procedure. Statistical analyses between the mean ideal body weight computed on the basis of 15% body fat and by the regression equation for these subjects revealed no significant difference. Data analyses of independent studies have also indicated that a 12 cm difference between chest and abdominal girth was associated with approximately 15% of body fat or less. It was suggested that in a field situation, the regression equation could prove a useful tool in predicting ideal body weight. 相似文献
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Maurice R. Berube 《The Urban Review》1983,15(3):151-163
The historical evidence is examined to see how low-income students have fared in the urban public schools. Research shows that some schools have been able to raise low-income student achievement. In Rutter's 7-year study, leadership of the principal, high teacher expectations, and rigorous academic programs helped raise achievement. While some results have shown that a majority of low-income students have failed, some immigrant groups, such as Jews, seem to adapt more readily and perform better. The implication is that there may be hope for a substantial improvement in the urban public schools. 相似文献
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Maurice E. Shelby Jr. 《Communication Studies》2013,64(4):231-241
Primary purpose of this investigation was to uncover basic trends in the revocation and non‐renewal of broadcasting licenses spanning the history of the Federal Communications Commission through 1969. 相似文献
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In order to get bounce and movement seam bowlers need to bowl the ball “into” the pitch. Standard deliveries by elite players are typically projected at around 7° below horizontal. In contrast, young players currently often need to release the ball almost horizontally in an effort to get the ball to bounce close enough to the batter. We anticipated that shortening the pitch could be a simple way to help young bowlers to release the ball at a better angle and with more consistency. Twenty county or best in club age group under 10 and under 11 seam bowlers were analysed bowling indoors on two different pitch lengths. They were found to project the ball on average 3.4° further below horizontal on a 16 yard pitch compared with a 19 yard pitch, while ball speed and position at release changed negligibly. Pitch length did not affect the consistency of the release parameters. The shorter pitch led to a ball release angle closer to that of elite bowlers without changing release speed, and this should enable players to achieve greater success and develop more variety in their bowling. 相似文献
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