室伏由佳 : 順天堂大学大学院スポーツ健康科学研究科 (Graduate School of Health and Sports Science. Juntendo University)
抄録
Abstract
Support around the pelvis stabilizes the pelvis, preventing posterior pelvic tilt. The back muscles elongate, allowing the correct posture to be maintained. In other words, the activity of the erector spinae presumably increases as a result of support around the pelvis, and an increase of about 24% has been noted. Compression shorts cover the thighs, so the vastus medialis (part of the quadriceps muscle group that is used to swing the knee forward) also provides support. This stabilizes the pelvis when the knee is swung forward. Thus, the activity of the vastus medialis presumably increases, and an increase of about 64% has been noted. The hamstring (at the back of the thigh) and the lateral gastrocnemius are muscles that are active when the foot comes in contact with the ground, so their activity will not change substantially as long as there are no changes in weight or changes in the exercise load. Accordingly, activity of the hamstring and lateral gastrocnemius was roughly the same with an average weight and exercise load. Activity of the rectus abdominis was about the same, and there were no marked differences. These electromyographic findings revealed that X was significantly greater than C for the vastus medialis and erector spinae. X was greater than C for 3 other muscles. When C was considered to be 100%, X had an increase in muscle activity of about 22.9% in comparison to C.
Energy expenditure was gauged based on heart rate and metabolism while walking. X tended to be about 5% greater than C, i.e. energy expenditure was about 280 kcal in terms of daily metabolism and about 12 kcal in terms of hourly metabolism. In other words, an exercise load results in a metabolism while walking that is about 3 times the metabolism at rest. The load was comparable to moderate walking, resulting in increased energy expenditure in conjunction with an increase in muscle activity.
骨盤ショーツにおける歩行時の生理応答
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