In recent years, it has become vital to demand the stability of the body trunk when athletes train or when treating low back pain. According to the theory Cresswell advocates, to stabilize the trunk muscles, of the two muscles of the trunk muscle, the local muscles, rather than the global muscles need to be exercised. In our previous work, we reported on the effectiveness of using high load exercise to stimulate the local muscles. However, though this method was effective with athletes, it was not appropriate for people in a weakened state or the elderly. So in order to develop a method that would use a light load to stimulate the local muscle, this time we experimented with vibration stimulation.The subjects were 52 men in normal health (17.0±0.8 years old, 171.0±5.5cm, and 63.2±5.4kg). The evaluation method measured a muscular thickness of the external oblique, the internal oblique muscle, and the transversus abdominis muscle by using ultrasonic diagnostic equipment. The ratio of each muscle was calculated from the combined thickness of these three muscles. The vibrational frequency was 30Hz and the amplitude was set at low, using the Redcord Stimula. The movement task was a push up position suspended in the air by using two Redcord trainers. The vibratory stimulation was separately stimulated from the part of the hand and the part of the foot and trunk muscles thickness was then measured. As a result, it was confirmed that vibration from the upper extremities maximized the contraction of the TrA local muscle. Moreover, it was confirmed to oppress the shrinkage of the external oblique and the internal oblique muscle that are Global muscles. It was concluded that vibration stimulation is effective in stimulating Local muscles.
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