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Senda Sammoud Alan Michael Nevill Yassine Negra Raja Bouguezzi Chaabene Helmi Younés Hachana 《Journal of sports sciences》2019,37(10):1162-1167
The purpose of this study was to estimate the optimal body size, limb-segment length, girth or breadth ratios for 100-m backstroke mean speed performance in young swimmers. Sixty-three young swimmers (boys [n = 30; age: 13.98 ± 0.58 years]; girls [n = 33; age: 13.02 ± 1.20 years]) participated in this study. To identify the optimal body size and body composition components associated with 100-m backstroke speed performance, we adopted a multiplicative allometric log-linear regression model, which was refined using backward elimination. The multiplicative allometric model exploring the association between 100-m backstroke mean speed performance and the different somatic measurements estimated that biological age, sitting height, leg length for the lower-limbs, and two girths (forearm and arm relaxed girth) are the key predictors. Stature and body mass did not contribute to the model, suggesting that the advantage of longer levers was limb-specific rather than a general whole-body advantage. In fact, it is only by adopting multiplicative allometric models that the abovementioned ratios could have been derived. These findings highlighted the importance of considering somatic characteristics of young backstroke swimmers and can help swimming coaches to classify their swimmers and enable them to suggest what might be the swimmers’ most appropriate stroke (talent identification). 相似文献
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通过对运动员两种仰泳出发技术的预备姿势、离台阶段、腾空阶段、入水阶段和头到达指定距离的时间进行了有关运动学特征的比较和分析。结果表明,脚出水面仰泳出发技术的预备姿势重心高,离壁角度大,离壁速度快,双手空中移动速度快,手入水距离远,入水角度较小;从水下滑行到5m、7.5m段的时间看,脚出水面仰泳出发技术的优势明显,脚出水面的仰泳出发技术优于脚不出水面的仰泳出发技术。 相似文献
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赵菁多次在世界性游戏比赛中打破和创造200m仰游亚洲纪录、世界纪录。自2005第十届全运会到2009年第十一届全运会止,赵菁200m仰游个人最好成绩的增长是由三次飞跃与一个平台期组成,表现为螺旋式上升的提高,在比赛中运用的战术模式较为稳定。在发扬其速度能力与强有力的后程冲刺能力的基础上,积极探索提高其中段游程的能力是其成绩提高的关键。 相似文献
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采用文献资料法、观察法对参加2011年全国游泳锦标赛和冠军赛的运动员进行观察与统计,运用调查法对部分国家队、省市专业队教练员以及国际级以上裁判员进行调查,分析我国高水平游泳运动员在技术方面运用规则的优势与不足.建议仰泳运动员出发时提高脚的位置,从而提高身体重心位置,减少水对运动员背部、臀部的阻力,使身体在空中的抛物线更加合理;部分仰泳运动员转身过程中没有连贯划臂,使动作出现停顿;蛙泳运动员出发和转身后应充分利用水下海豚式打腿增大推进力,同时避免犯规. 相似文献
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Victoria Brackley Kevin Ball Elaine Tor 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(6):595-607
The effectiveness of the swimming turn is highly influential to overall performance in competitive swimming. The push-off or wall contact, within the turn phase, is directly involved in determining the speed the swimmer leaves the wall. Therefore, it is paramount to develop reliable methods to measure the wall-contact-time during the turn phase for training and research purposes. The aim of this study was to determine the concurrent validity and reliability of the Pool Pad App to measure wall-contact-time during the freestyle and backstroke tumble turn. The wall-contact-times of nine elite and sub-elite participants were recorded during their regular training sessions. Concurrent validity statistics included the standardised typical error estimate, linear analysis and effect sizes while the intraclass correlating coefficient (ICC) was used for the reliability statistics. The standardised typical error estimate resulted in a moderate Cohen’s d effect size with an R2 value of 0.80 and the ICC between the Pool Pad and 2D video footage was 0.89. Despite these measurement differences, the results from this concurrent validity and reliability analyses demonstrated that the Pool Pad is suitable for measuring wall-contact-time during the freestyle and backstroke tumble turn within a training environment. 相似文献
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Abstract In this study, we assessed arm coordination in the backstroke over increasing speeds by adapting the index of coordination originally used in the front crawl. Fourteen elite male backstroke swimmers swam four trials of 25 m at the speeds corresponding to the 400-m, 200-m, 100-m, and 50-m events. The six phases of the arm stroke were identified by video analysis and then used to calculate the index of coordination, which corresponded to the time between the propulsive phases of the two arms. With increases in speed, the elite swimmers increased the stroke rate, the relative duration of their arm pull, and their index of coordination, and decreased the distance per stroke (P < 0.05). Arm coordination was always in catch-up (index of coordination of ?12.9%) because the alternating body-roll and the small shoulder flexibility did not allow the opposition or superposition coordination seen in the front crawl. This new method also quantified the relative duration of the hand's lag time at the thigh, which did not change (～2%) with increasing speed for the elite swimmers. The index of coordination enables coaches to assess mistakes in backstroke coordination, particularly in the hand's lag time at the thigh. 相似文献
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