Kamiue Masanori, Ito Tomotaka, Tsubahara Akio, Kishimoto Tomoya
From the Doctoral Program in Rehabilitation, Graduate School of Health Science and Technology, Kawasaki University of Medical Welfare, Kurashiki, Japan (MK); Department of Physical Therapy, Faculty of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Japan (TI, AT); and Department of Rehabilitation, Yamamoto Orthopedic Clinic, Kurashiki, Japan (TK).
Am J Phys Med Rehabil. 2024 Jan 1;103(1):24-30. doi: 10.1097/PHM.0000000000002299. Epub 2023 Aug 7.
The study aimed to determine the relationship between knee extension torque induced by repetitive peripheral magnetic stimulation and the characteristics of the participants.
This was a basic study with noninvasive intervention. Knee extension torque induced by repetitive peripheral magnetic stimulation (repetitive peripheral magnetic stimulation-induced torque) and maximum voluntary contraction were measured. Stepwise method of multiple regression was performed to determine the factors affecting repetitive peripheral magnetic stimulation-induced torque at 100% intensity and repetitive peripheral magnetic stimulation-induced torque divided by maximum voluntary contraction (percent maximum voluntary contraction). Subcutaneous fat thickness, vastus lateralis muscle thickness measured by ultrasound, maximum voluntary contraction, and mean power frequency of electromyography during maximum voluntary contraction were selected as independent variables.
Repetitive peripheral magnetic stimulation was applied to the right vastus lateralis of 30 young healthy adults (average age, 21.1 ± 0.3 yrs). In the multiple regression analysis, repetitive peripheral magnetic stimulation-induced torque ( P < 0.001) was shown to be independently and significantly associated with maximum voluntary contraction (β = 0.510), subcutaneous fat thickness (β = -0.358), and vastus lateralis muscle thickness (β = 0.208), while percent maximum voluntary contraction value ( P < 0.05) was independently and significantly associated with vastus lateralis muscle thickness (β = 1.059).
Repetitive peripheral magnetic stimulation-induced torque decreases with thicker subcutaneous fat and increases with stronger maximum voluntary contraction or with thicker muscle.
本研究旨在确定重复性外周磁刺激诱发的膝关节伸展扭矩与参与者特征之间的关系。
这是一项采用非侵入性干预的基础研究。测量了重复性外周磁刺激诱发的膝关节伸展扭矩（重复性外周磁刺激诱发扭矩）和最大自主收缩。采用多元逐步回归方法确定在100%强度下影响重复性外周磁刺激诱发扭矩以及重复性外周磁刺激诱发扭矩除以最大自主收缩（最大自主收缩百分比）的因素。选取皮下脂肪厚度、超声测量的股外侧肌厚度、最大自主收缩以及最大自主收缩期间肌电图的平均功率频率作为自变量。
对30名年轻健康成年人（平均年龄，21.1±0.3岁）的右侧股外侧肌进行了重复性外周磁刺激。在多元回归分析中，重复性外周磁刺激诱发扭矩（P<0.001）显示与最大自主收缩（β=0.510）、皮下脂肪厚度（β=-0.358）和股外侧肌厚度（β=0.208）独立且显著相关，而最大自主收缩百分比值（P<0.05）与股外侧肌厚度（β=1.059）独立且显著相关。
重复性外周磁刺激诱发扭矩随皮下脂肪增厚而降低，随最大自主收缩增强或肌肉增厚而增加。
