Department of Sport Injuries and Corrective Exercises, Faculty of Physical education and sport science, Allameh Tabataba'i University, Tehran, Iran.
BMC Musculoskelet Disord. 2023 May 30;24(1):429. doi: 10.1186/s12891-023-06563-y.
Kickboxing is considered as a combat sport in progress, in which injuries are frequent and significant, and close injury monitoring is highly recommended. Sports injuries to the head and neck are estimated to cause 70% deaths and 20% permanent disabilities although they are much less common than those to the limbs. Whiplash mechanism involves the rapid extension (opening) and flexion (bending) of neck. The purpose of the current study was to investigate the electromyographic activity of selected muscles in the whiplash mechanism in aware and unaware conditions of the safe punching in kickboxing so that we can design special exercises.
In the present study, 24 male kickboxing athletes aged 18-40 years were selected based on a purposive sampling method. The surface electromyography (EMG) signals of muscles were recorded with and without awareness of safe punching by using a nine-channel wireless EMG device. Additionally, a nine-channel 3D inertial measurement unit (IMU, wireless,) was utilized to determine the acceleration, kinematics, and angular velocity of the subjects' head. The statistical dependent t-test was applied to compare the EMG activity of each muscle, as well as its participation ratio.
The results of statistical analysis represented a significant increase in the EMG activity of sternocleidomastoid (p = 0.001), upper trapezius (p = 0.001) and cervical erector spinae muscles (p = 0.001), as well as the neck extension and flexion angles between the athletes aware (open eyes) and unaware (closed eyes) of the safe punching.
In this study, the EMG activity of the sternocleidomastoid, upper trapezius, and cervical erector spine muscles in the aware condition was significantly different from the activity under unaware condition. In fact, the intended muscles exhibited significantly different behaviors in preventing extension and flexion in the two conditions.
踢拳被认为是一项进行中的格斗运动，其中频繁发生重大伤害，因此强烈建议进行密切的伤害监测。头部和颈部的运动伤害据估计导致 70%的死亡和 20%的永久性残疾，尽管它们比四肢的伤害要少见得多。鞭打机制涉及颈部的快速伸展（张开）和屈曲（弯曲）。本研究的目的是调查在踢拳中意识到和未意识到安全出拳的情况下，鞭打机制中选定肌肉的肌电图（EMG）活动，以便我们可以设计特殊的练习。
在本研究中，根据目的抽样法选择了 24 名年龄在 18-40 岁的男性踢拳运动员。使用九通道无线 EMG 设备记录了在意识到和未意识到安全出拳的情况下肌肉的表面 EMG（EMG）信号。此外，使用九通道 3D 惯性测量单元（IMU，无线）来确定受试者头部的加速度、运动学和角速度。应用统计依赖 t 检验比较了每个肌肉的 EMG 活动及其参与率。
统计分析的结果表明，意识到（睁眼）和未意识到（闭眼）安全出拳时，胸锁乳突肌（p=0.001）、上斜方肌（p=0.001）和颈伸肌（p=0.001）的 EMG 活动以及颈部伸展和屈曲角度显著增加。
在这项研究中，在意识到的情况下，胸锁乳突肌、上斜方肌和颈伸肌的 EMG 活动与无意识状态下的活动明显不同。事实上，在这两种情况下，预期的肌肉在防止伸展和屈曲方面表现出明显不同的行为。
