Observation and technicalcharacterization in swimming: 200 mbreaststroke
Ana ConceiçãoI, III; António SilvaII,III; Tiago M. BarbosaIII, IV; Hugo LouroI, III
IHigher Sports School of Rio Maior, RioMaior, Portugal IIUniversity of Trás-os-Montes and Alto Douro, Vila Real,Portugal IIICenter of Investigation in Sports, Health and Human Development,Vila Real, Portugal IVNanyang Technological
[p]Characterization of the breaststroke technique,regarding the relationship between kinematic and neuromuscular parameters.[/p][p]关于运动学和神经肌肉参数之间关系的蛙泳技术的表征。[/p]
[p]Surface electromyographic signals (EMG)were used to yze the dynamics of neuromuscular activity of the musclespectoralis major (PM), biceps brachii (BB), triceps brachii (TB) and anteriordeltoid (AD), in twelve national elite swimmers. A couple of cameras (anunderwater camera and an above the water surface camera) were used to provide adual projection that permits ysis of kinematic variables (Speed, SF, SL) inthe 200 m breaststroke event.[/p][p]表面肌电信号（EMG）用于分析12名全国优秀游泳运动员的胸大肌（PM），肱二头肌（BB），肱三头肌（TB）和前三角肌（AD）的神经肌肉活动动态。一对相机（水下相机和水面相机上方）用于提供双投影，允许分析200米蛙泳事件中的运动学变量（速度，SF，SL）。[/p]
[p]Swimming speed decreased from 1.41 (0.07)to 1.16 (0.09) m.s1(P<0.05). Stroke length decreased from 2.32 (0.37) to1.96 (0.24) m, while stroke frequency suffered decrease from 37.52 (5.16) to34.40 (3.58) cycle/min of 1st lap 50 m until the 3rd lap of 50 m, slightlyincreasing in the last lap to 35.82 (3.39) cycle/min. Blood lactate increasedfrom 1.12 (0.22) to 12.00 (3.23) mmol.L-1. EMG results indicated increase infrequency concerning amplitude for all muscles studied: BB, PM and TB, exceptfor the AD. Negative correlation between speed frequency, SF and SL wasobtained, i.e. to the muscles BB, TB and PM there was a correlation betweenspeed, SF and SL, meaning that as the kinematic variables increase, thefrequency decreases. The correlations suggested that the neuromuscularactivation presents a direct correlation with the kinematic variables,especially for frequency reduction in the BB, TB and PM muscles, and to a highextent and correlation with the kinematic variables in PM.[/p][p]游泳速度从1.41（0.07）降至1.16（0.09）m.s1（P <0.05）。行程长度从2.32（0.37）减少到1.96（0.24）m，而行程频率从第一圈50米的37.52（5.16）减少到34.40（3.58）周/分，直到第三圈50米，略有增加。最后一圈为35.82（3.39）周期/分钟。血乳酸从1.12（0.22）增加到12.00（3.23）mmol.L-1。 EMG结果表明所研究的所有肌肉的振幅频率增加：BB，PM和TB，AD除外。获得速度频率，SF和SL之间的负相关，即对于肌肉BB，TB和PM，速度，SF和SL之间存在相关性，这意味着作为运动学变量增加，频率降低。相关性表明神经肌肉激活与运动学变量直接相关，特别是对于BB，TB和PM肌肉的频率降低，并且在很大程度上与PM中的运动学变量相关。[/p]
[p]The relationship between the kinematicvariables and EMG is decisive in the swimming performance evaluation, intraining exercises outside the pool to increase muscular endurance of musclesinvolved in the breaststroke technique.[/p][p]运动变量和肌电图之间的关系在游泳性能评估中是决定性的，在游泳池外进行训练，以增加蛙泳技术中肌肉的肌肉耐力。[/p]
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