The effects of unknown additional eccentric loading on bench-press kinematics and muscle activation in professional handball and rugby players

IF 2.4 3区医学 Q2 SPORT SCIENCES

European Journal of Sport Science Pub Date : 2019-11-18 DOI:10.1080/17461391.2019.1694587

D. García-López, Sergio Maroto-Izquierdo, Raúl Zarzuela, E. Martín-Santana, Sandra Antón, S. Sedano

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引用次数: 2

Abstract

Abstract This study aimed to investigate the influence of unknown additional eccentric loading on bench-press kinematics (peak velocity, peak acceleration and accelerative percentage of the concentric phase) and muscle activation (pectoralis major and anterior deltoid) in professional rugby and handball players. Seventeen professional athletes were randomly assigned to complete three separate bench-press repetitions with different AEL schemes (100/40%, 100/60% and 100/80% of 1RM eccentric/concentric loading, respectively) under two conditions: known- and unknown-concentric load (KL and UL, respectively). Results indicate that the lack of knowledge regarding the additional eccentric load induced a significant increase in peak acceleration and agonist-muscles electromyographic activity, with no changes regarding peak velocity or accelerative percentage during the concentric phase. These results support the use of unknown loads as a practical strategy in eliciting rapid muscle activation and force production, which is critical in many sports, such as handball or rugby.

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未知额外偏心负荷对专业手球和橄榄球运动员卧推运动学和肌肉激活的影响

摘要本研究旨在探讨未知额外偏心负荷对职业橄榄球和手球运动员卧推运动学(峰值速度、峰值加速度和同心相加速度百分比)和肌肉激活(胸大肌和前三角肌)的影响。17名专业运动员被随机分配在已知和未知同心负荷(分别为KL和UL)两种条件下，以不同的AEL方案(分别为100/40%、100/60%和100/80%的1RM偏心/同心负荷)完成3次单独的卧推重复。结果表明，缺乏对额外偏心负荷的了解，导致峰值加速度和激动剂肌肉肌电图活动显著增加，而在同心阶段，峰值速度或加速度百分比没有变化。这些结果支持使用未知负荷作为引发快速肌肉激活和力量产生的实用策略，这在许多运动中是至关重要的，如手球或橄榄球。

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来源期刊

European Journal of Sport Science 医学-运动科学

CiteScore

6.60

自引率

3.10%

发文量

153

审稿时长

6-12 weeks

期刊介绍： The European Journal of Sport Science (EJSS) is the official Medline- and Thomson Reuters-listed journal of the European College of Sport Science. The editorial policy of the Journal pursues the multi-disciplinary aims of the College: to promote the highest standards of scientific study and scholarship in respect of the following fields: (a) Applied Sport Sciences; (b) Biomechanics and Motor Control; c) Physiology and Nutrition; (d) Psychology, Social Sciences and Humanities and (e) Sports and Exercise Medicine and Health.