Arora Shruti, Button Duane C, Basset Fabien A, Behm David G
Memorial University of Newfoundland, St. John's, Newfoundland, Canada.
Int J Sports Phys Ther. 2013 Aug;8(4):370-80.
PURPOSE/BACKGROUND: Proper strengthening of the core and upper extremities is important for muscular health, performance, and rehabilitation. Exercise devices have been developed that attempt to disrupt the center of gravity in order to activate the trunk stabilizing muscles. The objective of this study was to analyze the trunk and shoulder girdle muscle activation with double and single oscillating exercise devices (DOD and SOD respectively) in various planes.
TWELVE MALE SUBJECTS PERFORMED THREE INTERVENTIONS USING BOTH DEVICES UNDER RANDOMIZED CONDITIONS: single-handed vertical orientation of DOD and SOD to produce 1) medio-lateral oscillation in the frontal plane 2) dorso-ventral oscillation in the sagittal plane and 3) single-handed horizontal orientation for superior and inferior oscillation in the transverse plane. Electromyographic (EMG) activity during the interventions of the anterior deltoid, triceps brachii, biceps brachii, forearm flexors as well as lower abdominal and back stabilizer muscles was collected, and were normalized to maximal voluntary contractions. A two way repeated measures ANOVA (2x3) was conducted to assess the influence of the devices and movement planes on muscle activation.
The DOD provided 35.9%, 40.8%, and 52.3% greater anterior deltoid, transverse abdominus (TA)/internal oblique (IO) and lumbo-sacral erector spinae (LSES) activation than did the SOD respectively. Effect size calculations revealed that these differences were of moderate to large magnitude (0.86, 0.48, and 0.61 respectively). There were no significant differences in muscular activation achieved between devices for the triceps brachii, biceps brachii and forearm flexor muscles. Exercise in the transverse plane resulted in 30.5%, 29.5%, and 19.5% greater activation than the sagittal and 21.8%, 17.2%, and 26.3% greater activation than the frontal plane for the anterior deltoid, TA/IO and LSES respectively.
A DOD demonstrated greater muscular activity for trunk and shoulder muscle activation but does not provide an advantage for limb activation. Overall, oscillating the devices in the transverse plane provided greater muscular activation of the anterior deltoid, TA/IO and LSES than use of the devices during frontal or sagittal plane movements.
2c: Outcomes research.
目的/背景：适当强化核心肌群和上肢对肌肉健康、运动表现及康复至关重要。已研发出一些运动器械，试图通过干扰重心来激活躯干稳定肌。本研究的目的是分析在不同平面使用双振荡和单振荡运动器械（分别为DOD和SOD）时躯干和肩带肌的激活情况。
12名男性受试者在随机条件下使用这两种器械进行三项干预：DOD和SOD单手垂直定向，以产生1）额面的内外侧振荡；2）矢状面的背腹侧振荡；3）单手水平定向，在横断面进行上下振荡。在干预过程中收集三角肌前束、肱三头肌、肱二头肌、前臂屈肌以及下腹部和背部稳定肌的肌电图（EMG）活动，并将其归一化至最大自主收缩。进行双向重复测量方差分析（2×3）以评估器械和运动平面对肌肉激活的影响。
与SOD相比，DOD分别使三角肌前束、腹横肌（TA）/腹内斜肌（IO）和腰骶竖脊肌（LSES）的激活增加35.9%、40.8%和52.3%。效应量计算表明，这些差异为中等至较大程度（分别为0.86、0.48和0.61）。肱三头肌、肱二头肌和前臂屈肌在两种器械间的肌肉激活无显著差异。在横断面运动时，三角肌前束、TA/IO和LSES的激活分别比矢状面高30.5%、29.5%和19.5%，比额面高21.8%、17.2%和26.3%。
DOD在激活躯干和肩部肌肉方面表现出更强的肌肉活动，但在激活肢体方面并无优势。总体而言，在横断面振荡器械比在额面或矢状面运动时使用器械能使三角肌前束、TA/IO和LSES产生更强的肌肉激活。
2c：结果研究。
