Neuromuscular Performance of Explosive Power Athletes versus Untrained Individuals
Neuromuscular Performance of Explosive Power Athletes versus Untrained Individuals
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DOI：
10.1249/mss.0b013e3181be9c7e
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发表时间：
2010-04-01
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影响因子：
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通讯作者：
Folland, Jonathan P.
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作者：
Tillin, Neale A.;Jimenez-Reyes, Pedro;Folland, Jonathan P.
蒂林河一、P. Jimenez-Reyes，M. T. G. Pain和J. P. Folland。爆发力运动员与未经训练的个体的神经肌肉表现。医学科学体育锻炼：第42卷，第4期，第100页。781-790，2010年。目的：电机械延迟（EMD）和力发展率（RFD）是决定爆发性神经肌肉性能的因素。我们可以预期，具有明显爆发性收缩能力的爆发力运动员和未经训练的个体之间的EMD和RFD存在对比。然而，比较和神经肌肉机制的任何差异还没有被研究。研究方法：在一系列的抽搐，强直，爆发力，最大自愿等长伸膝过程中，对爆发力运动员（n = 9）和未经训练的对照组（n = 10）的神经肌肉性能进行了评估。在三个50 ms的时间窗内测量膝关节伸展力和浅股四头肌的EMG，并分别标准化为强度和最大M波（M-max）。不自主和自愿EMD分别由抽搐和爆发性自主收缩确定，两组相似。结果：运动员强壮了28%，他们在前50 ms的绝对RFD是对照组的两倍。在爆发性自主收缩的前50 ms期间，运动员具有更大的标准化RFD（4.86 +/- 1.46 vs 2.81 +/- 1.20 MVC.s（-1））和神经激活（平均四头肌，0.26 +/- 0.07 vs 0.15 +/- 0.06 M-max）。令人惊讶的是，对照组在第二个50 ms中有更大的标准化RFD（6.68 +/- 0.92 vs 7.93 +/- 1.11 MVC.s（-1）），并且在此期间之前EMG的变化更大。然而，两组之间的抽搐反应或标准化强直RFD没有差异。结论：运动员和对照组之间自愿标准化RFD的差异被解释为激动剂肌肉神经激活，而不是由相似的固有收缩特性的群体。
TILLIN, N. A., P. JIMENEZ-REYES, M. T. G. PAIN, and J. P. FOLLAND. Neuromuscular Performance of Explosive Power Athletes versus Untrained Individuals. Med. Sci. Sports Exerc., Vol. 42, No. 4, pp. 781-790, 2010. Purpose: Electromechanical delay (EMD) and rate of force development (RFD) are determinants of explosive neuromuscular performance. We may expect a contrast in EMD and RFD between explosive power athletes, who have a demonstrable ability for explosive contractions, and untrained individuals. However, comparison and the neuromuscular mechanisms for any differences have not been studied. Methods: The neuromuscular performance of explosive power athletes (n = 9) and untrained controls (n = 10) was assessed during a series of twitch, tetanic, explosive, and maximum voluntary isometric knee extensions. Knee extension force and EMG of the superficial quadriceps were measured in three 50-ms time windows from their onset and were normalized to strength and maximal M-wave (M-max), respectively. Involuntary and voluntary EMD were determined from twitch and explosive voluntary contractions, respectively, and were similar for both groups. Results: The athletes were 28% stronger, and their absolute RFD in the first 50 ms was twofold that of controls. Athletes had greater normalized RFD (4.86 +/- 1.46 vs 2.81 +/- 1.20 MVC.s(-1)) and neural activation (mean quadriceps, 0.26 +/- 0.07 vs 0.15 +/- 0.06 M-max) during the first 50 ms of explosive voluntary contractions. Surprisingly, the controls had a greater normalized RFD in the second 50 ms (6.68 +/- 0.92 vs 7.93 +/- 1.11 MVC.s(-1)) and a greater change in EMG preceding this period. However, there were no differences in the twitch response or normalized tetanic RFD between groups. Conclusions: The differences in voluntary normalized RFD between athletes and controls were explained by agonist muscle neural activation and not by the similar intrinsic contractile properties of the groups.