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Pippa Powers Andrew Harrison 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):135-146
This study examined the effects of the rider on the linear projectile kinematics of show‐jumping horses. SVHS video recordings (50 Hz) of eight horses jumping a vertical fence 1 m high were used for the study. Horses jumped the fence under two conditions: loose (no rider or tack) and ridden. Recordings were digitised using Peak Motus. After digitising the sequences, each rider's digitised data were removed from the ridden horse data so that three conditions were examined: loose, ridden (including the rider's data) and riderless (rider's data removed). Repeated measures ANOVA revealed significant differences between ridden and loose conditions for CG height at take‐off (p < 0.001), CG distance to the fence at take‐off (p = 0.001), maximum CG during the suspension phase (p < 0.001), CG position over the centre of the fence (p < 0.001), CG height at landing (p < 0.001), and vertical velocity at take‐off (p < 0.001). The results indicated that the rider's effect on jumping horses was primarily due to behavioural changes in the horse's motion (resulting from the rider's instruction), rather than inertial effects (due to the positioning of the rider on the horse). These findings have implications for the coaching of riders and horses. 相似文献
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NBA六十年的历史中有很多传奇人物,拉里·约翰逊绝对是其中的一个。他是NBA中最强壮的球员之一,即使同卡尔·马龙、阿伦佐·莫宁等人对抗也绝不会吃亏,但他的绰号却是非常温柔的大妈;他是联盟历史上第一个签下亿元合同的球员——1991年,身为选秀状元的拉里·约翰逊同黄蜂队签下了一份12年1.1亿美元的合同,这是他的第一个合同,也是最后一个——因为伤病他只打了10个赛季;他是联盟中打架最多的球员之一,但却拥有很多朋友,查尔斯·巴克利曾经说过:如果拉里能选择继续再干一年的话,我做梦都会笑出声来。他曾经有单赛季场均11个篮板球的表现,但他的身高其实不足两米。 相似文献
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伍辉载 《体育健康知识画刊》2012,(4):82-85
去年的12月4日,记者在手机报上看到了一则"红薯大妈唱红北师大"的新闻,当时想这挺有意思的呀,卖红薯的有很多,但卖红薯火了的,还真是没见过。带着几分好奇,记者来到了北师五食堂,见到了这位传说中的"红薯大妈"。 相似文献
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