Yang Yang, Changxiao Yu, Chenhao Yang, Liqin Deng, W. Fu
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引用次数: 0
Abstract
BACKGROUND: The ability of the lower-extremity muscle activation directly affects the performance and in turn interacts with the loading conditions of the muscle itself. However, systematic information concerning the characteristics of lower-extremity muscle during landings is lacking. In particular, the landing height and shoes are also important factors based on the actual situation, which could further contribute to understanding the neuromuscular activity and how biochemical response of the body tissues to double-leg drop landings. OBJECTIVE: The study was to investigate the effects of landing tasks on the activation of lower-extremity muscles and explore the relationship among movement control, landing heights, shoe cushioning, and muscle activities. METHODS: Twelve male basketball players were recruited to perform drop jump (DJ) and passive landing (PL) from three heights (30, 45, and 60 cm) while wearing highly-cushioned basketball shoes (HC) and less-cushioned control shoes (LC). EMG electrodes were used to record the activities of the target muscles (rectus femoris, vastus lateralis, biceps femoris, tibialis anterior, and lateral gastrocnemius) during the landing tasks. RESULTS: Pre- and post-activation activity of the lower-extremity muscles significantly decreased during PL compared with those during DJ (p< 0.05). No significant shoe effects on the characteristics of muscle activation and coactivation during DJ movements were observed. However, the participants wearing LC showed significantly higher muscle post-activation (p< 0.05) at the three drop heights during PL compared with those wearing HC. Coactivation of the ankle muscles was higher in LC than in HC during 30-cm PL (p< 0.05). CONCLUSIONS: The activation patterns of lower-extremity muscles can be significantly influenced by landing types. Highly-cushioned basketball shoes would help reduce the risk of injuries by appropriately tuning the muscles during the PL.
背景:下肢肌肉的激活能力直接影响运动表现，并反过来与肌肉本身的负荷条件相互作用。然而，关于着陆时下肢肌肉特征的系统信息是缺乏的。特别是落地高度和鞋子也是根据实际情况考虑的重要因素，这有助于进一步了解神经肌肉活动和身体组织对双腿落地的生化反应。目的:研究着陆任务对下肢肌肉活动的影响，并探讨运动控制、着陆高度、鞋缓冲和肌肉活动之间的关系。方法:招募12名男子篮球运动员，分别穿着高缓冲篮球鞋(HC)和低缓冲对照鞋(LC)，从30、45和60 cm 3个高度进行落体跳(DJ)和被动落地(PL)。肌电图电极记录目标肌肉(股直肌、股外侧肌、股二头肌、胫骨前肌和腓肠肌外侧肌)在着陆过程中的活动。结果:与DJ组相比，PL组下肢肌肉激活前和激活后活性显著降低(p< 0.05)。在DJ运动中，没有观察到鞋子对肌肉激活和协同激活特征的显著影响。然而，与HC组相比，LC组在PL过程中三个落差高度的肌肉后激活率显著高于HC组(p< 0.05)。在30 cm PL中，LC组踝关节肌肉的协同活化高于HC组(p< 0.05)。结论:着地类型对下肢肌肉的激活模式有显著影响。高缓冲的篮球鞋将有助于减少受伤的风险，适当调整肌肉在PL。
期刊介绍：
Isokinetics and Exercise Science (IES) is an international journal devoted to the study of theoretical and applied aspects of human muscle performance. Since isokinetic dynamometry constitutes the major tool in this area, the journal takes a particular interest in exploring the considerable potential of this technology.
IES publishes studies associated with the methodology of muscle performance especially with respect to the issues of reproducibility and validity of testing, description of normal and pathological mechanical parameters which are derivable from muscle testing, applications in basic research topics such as motor learning paradigms and electromyography. The journal also publishes studies on applications in clinical settings and technical aspects of the various measurement systems employed in human muscle performance research.
The journal welcomes submissions in the form of research papers, reviews, case studies and technical reports from professionals in the fields of sports medicine, orthopaedic and neurological rehabilitation and exercise physiology.
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