Calatayud Joaquin, Vinstrup Jonas, Jakobsen Markus D, Sundstrup Emil, Colado Juan Carlos, Andersen Lars L
a National Research Centre for the Working Environment , Copenhagen , Denmark.
b Research unit in Sport and Health, Department of Physical Education and Sports , University of Valencia , Valencia , Spain.
J Sports Sci. 2018 May;36(10):1162-1166. doi: 10.1080/02640414.2017.1363403. Epub 2017 Aug 10.
The purpose of this study was to investigate whether using different focus affects electromyographic (EMG) amplitude and contraction duration during bench press performed at explosive and controlled speeds. Eighteen young male individuals were familiarized with the procedure and performed the one-maximum repetition (1RM) test in the first session. In the second session, participants performed the bench press exercise at 50% of the 1RM with 3 different attentional focuses (regular focus on moving the load vs contracting the pectoralis vs contracting the triceps) at 2 speed conditions (controlled vs maximal speed). During the controlled speed condition, focusing on using either the pectoralis or the triceps muscles increased pectoralis normalized EMG (nEMG) by 6% (95% CI 3-8%; p = 0.0001) and 4% nEMG (95% CI 1-7%; p = 0.0096), respectively, compared with the regular focus condition. Triceps activity was increased by 4% nEMG (95% CI 0-7%; p = 0.0308) at the controlled speed condition during the triceps focus. During the explosive speed condition, the use of different focuses had no effect. The different attentional focus resulted in comparable contraction duration for the measured muscles when the exercise was performed explosively. Using internal focus to increase EMG amplitude seems to function only during conditions of controlled speed.
本研究的目的是调查在以爆发性速度和控制性速度进行卧推时，使用不同的注意力焦点是否会影响肌电图（EMG）幅度和收缩持续时间。18名年轻男性熟悉了该程序，并在第一阶段进行了一次最大重复次数（1RM）测试。在第二阶段，参与者在两种速度条件（控制性速度与最大速度）下，以1RM的50%进行卧推练习，有3种不同的注意力焦点（常规关注移动重量与收缩胸大肌与收缩肱三头肌）。在控制性速度条件下，与常规焦点条件相比，专注于使用胸大肌或肱三头肌时，胸大肌标准化肌电图（nEMG）分别增加了6%（95%置信区间3 - 8%；p = 0.0001）和4% nEMG（95%置信区间1 - 7%；p = 0.0096）。在肱三头肌焦点的控制性速度条件下，肱三头肌活动的nEMG增加了4%（95%置信区间0 - 7%；p = 0.0308）。在爆发性速度条件下，使用不同的焦点没有效果。当以爆发性方式进行运动时，不同的注意力焦点导致所测量肌肉的收缩持续时间相当。使用内部焦点来增加EMG幅度似乎仅在控制性速度条件下起作用。
