Giombini A, Menotti F, Laudani L, Piccinini A, Fagnani F, Di Cagno A, Macaluso A, Pigozzi F
Department of Medicine and Health Sciences, University of Molise, Via F. De Sanctis, 86100, Campobasso, Italy.
Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Piazza Lauro de Bosis 6, 00135, Rome, Italy.
Biol Sport. 2015 Sep;32(3):243-7. doi: 10.5604/20831862.1163369. Epub 2015 Jul 31.
Whole-body vibration (WBV) has been shown to enhance muscle activity via reflex pathways, thus having the potential to contrast muscle weakness in individuals with rupture of the anterior cruciate ligament (ACL). The present study aimed to compare the magnitude of neuromuscular activation during WBV over a frequency spectrum from 20 to 45 Hz between ACL-deficient and healthy individuals. Fifteen males aged 28±4 with ACL rupture and 15 age-matched healthy males were recruited. Root mean square (RMS) of the surface electromyogram from the vastus lateralis in both limbs was computed during WBV in a static half-squat position at 20, 25, 30, 35, 40 and 45 Hz, and normalized to the RMS while maintaining the half-squat position without vibration. The RMS of the vastus lateralis in the ACL-deficient limb was significantly greater than in the contralateral limb at 25, 30, 35 and 40 Hz (P<0.05) and in both limbs of the healthy participants (dominant limb at 25, 30, 35, 40 and 45 Hz, P<0.05; non dominant limb at 20, 25, 30, 35, 40 and 45 Hz, P<0.05). The greater neuromuscular activity in the injured limb compared to the uninjured limb of the ACL-deficient patients and to both limbs of the healthy participants during WBV might be due to either augmented excitatory or reduced inhibitory neural inflow to motoneurons of the vastus lateralis through the reflex pathways activated by vibratory stimuli. The study provides optimal WBV frequencies which might be used as reference values for ACL-deficient patients.
全身振动（WBV）已被证明可通过反射途径增强肌肉活动，因此有可能改善前交叉韧带（ACL）断裂患者的肌肉无力状况。本研究旨在比较ACL缺失个体与健康个体在20至45Hz频谱范围内进行WBV时神经肌肉激活的程度。招募了15名年龄在28±4岁的ACL断裂男性和15名年龄匹配的健康男性。在20、25、30、35、40和45Hz的静态半蹲姿势下进行WBV时，计算两侧股外侧肌表面肌电图的均方根（RMS），并将其标准化为保持半蹲姿势无振动时的RMS。在25、30、35和40Hz时，ACL缺失肢体的股外侧肌RMS显著高于对侧肢体（P<0.05），且在健康参与者的两侧肢体中也是如此（优势肢体在25、30、35、40和45Hz时，P<0.05；非优势肢体在20、25、30、35、40和45Hz时，P<0.05）。在WBV期间，ACL缺失患者受伤肢体与未受伤肢体相比，以及与健康参与者的两侧肢体相比，神经肌肉活动增强可能是由于通过振动刺激激活的反射途径，向股外侧肌运动神经元的兴奋性神经流入增加或抑制性神经流入减少。该研究提供了最佳的WBV频率，可作为ACL缺失患者的参考值。
