Yu Chang Ho, Kang Seung Rok, Kwon Tae Kyu
Division of Biomedical Engineering, Chonbuk National University, Deokjin-Dong 1-Ga, Jeonju, Jeonbuk 561-756, South Korea.
Department of Healthcare Engineering, Chonbuk National University, Deokjin-Dong 1-Ga, Jeonju, Jeonbuk 561-756, South Korea.
Biomed Mater Eng. 2014;24(6):2437-45. doi: 10.3233/BME-141057.
This research was performed to assess the effects of angled whole body vibration on muscle activity of the lower limbs, by examining adults in their twenties during squat exercises, taking into account two variables of exercise intensity (vibration frequency and gradient). Twenty healthy males in their twenties with previous experience of more than 6 month's weight training and no past medical history were included in this study. The experiment was performed by participating in squat exercises which consisted of 3 sets (1 set = 5 seconds x 3 repetitions of exercise), and the muscle activities of the Rectus Femoris, Vastus Lateralis, Vastus Medialis were measured with variation in the gradients of 0°, 10°, and 20°, and vibration frequencies of 20, 30, and 40 Hz. At 30 and 40 Hz, the vastus lateralis showed the highest change in muscle activity, while activity of the vastus medialis also increased significantly. Analysis of muscle activity according to the gradient showed a significant increase of the vastus lateralis at 20°, while the highest muscle activity at 20° was observed for the vastus medialis. In comparison of the change in lower limb muscle activity according to simultaneous stimulation, at a gradient of 10°, high activity was shown in muscle, while at 20°, high muscle activities were produced at 40 Hz in the vastus lateralis, 40 Hz in the rectus femoris, and both 30 and 40 Hz in the vastus medialis.
本研究旨在通过在深蹲练习中对二十多岁的成年人进行检查，考虑运动强度的两个变量（振动频率和坡度），来评估倾斜全身振动对下肢肌肉活动的影响。本研究纳入了20名二十多岁、有超过6个月重量训练经验且无既往病史的健康男性。实验通过参与由3组组成的深蹲练习（1组 = 5秒×3次重复运动）进行，并在坡度为0°、10°和20°以及振动频率为20、30和40赫兹的情况下测量股直肌、股外侧肌、股内侧肌的肌肉活动。在30赫兹和40赫兹时，股外侧肌的肌肉活动变化最大，而股内侧肌的活动也显著增加。根据坡度分析肌肉活动显示，在20°时股外侧肌显著增加，而股内侧肌在20°时肌肉活动最高。在根据同时刺激比较下肢肌肉活动的变化时，在10°的坡度下，肌肉显示出高活动，而在20°时，股外侧肌在40赫兹、股直肌在40赫兹以及股内侧肌在30赫兹和40赫兹时产生高肌肉活动。
