Effect of hand paddles and parachute on the index of coordination of competitive crawl-strokers
Effect of hand paddles and parachute on the index of coordination of competitive crawl-strokers
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DOI：
10.1080/02640414.2010.523086
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发表时间：
2011-01-01
影响因子：
3.4
通讯作者：
Andries Junior, Orival
中科院分区：
文献类型：
--
作者：
Telles, Thiago;Barbosa, Augusto C.;Andries Junior, Orival
研究了手划桨和降落伞对竞走运动员划水相相对持续时间和协调性指标的影响。十一名男泳手（年龄：21.9 +/- 4.5年; 50米最佳时间：24.23 +/-0.75秒）在四个最大强度条件下进行了评估：无设备，手桨，降落伞，手桨和降落伞。从视频（60 Hz）中分析每只手臂的相对划水相持续时间、游泳速度和划水率。以各臂推进相位之间的滞后时间为指标量化协调性指标，定义协调模式为追赶、对抗或叠加。在所有条件下，划水率均降低（P0.05），使用降落伞和桨+降落伞时游泳速度降低（P0.05）。协调模式从自由泳中的追赶（-2.3 +/-5.0%）转变为与划桨（-0.2 +/-3.8%）、降落伞（0.1 +/-3.1%）和划桨+降落伞（0.0 +/-3.2%）对抗。尽管存在这些差异，但在右臂和左臂中风阶段的相对持续时间或协调指数方面没有观察到显著差异。我们的结论是，外部阻力分析不显着影响中风相组织，但作为一种慢性效应，可能会导致更大的推进连续性。
We investigated the effects of hand paddles and parachute on the relative duration of stroke phases and index of coordination of competitive crawl-strokers. Eleven male-swimmers (age: 21.9 +/- 4.5 years; 50-m best time: 24.23 +/- 0.75s) were evaluated in four maximal-intensity conditions: without equipment, with hand paddles, with parachute, and with both hand paddles and parachute. Relative stroke phase duration of each arm, swimming velocity, and stroke rate were analysed from video (60Hz). The index of coordination was quantified based on the lag time between propulsive phases of each arm, which defined the coordination mode as catch-up, opposition or superposition. The stroke rate decreased in all conditions (P0.05) and swimming velocity decreased with parachute and with paddles+parachutes (P0.05). The coordination mode changed from catch-up in free swimming (-2.3 +/- 5.0%) to opposition with paddles (-0.2 +/- 3.8%), parachute (0.1 +/- 3.1%), and paddles+parachute (0.0 +/- 3.2%). Despite these variations, no significant differences were observed in relative duration of right and left arm-stroke phases, or in index of coordination. We conclude that the external resistances analysed do not significantly influence stroke phase organization, but, as a chronic effect, may lead to greater propulsive continuity.