class="Heading">Background class="Para">Previous surface electromyogram (EMG) studies have shown that chronic rotator cuff tears (RCT) may be associated with a altered activation of adjacent shoulder muscles. The effect of RCT on central neuromuscular control mechanisms of the shoulder girdle muscles such as the deltoideus muscle (DM), a key muscle of shoulder function, has as not yet been studied in detail. class="Heading">Materials and methods class="Para">This study investigated the corticospinal excitability of the DM to assess the effects of RCT on the central neuromuscular function of proximal upper limb muscles. The motor-evoked potentials (MEP) in response to transcranial magnetic stimulation of DM on both sides were obtained from patients with unilateral RCT and compared with healthy control subjects. class="Heading">Results class="Para">In patients, stimulus response curves of DM demonstrated a bilateral hyperexcitability at rest and a hypoexcitability during voluntary activation (F?=?3.82, P?=?0.007). class="Heading">Conclusions class="Para">The DM hyperexcitability may be related to alterations in the sensory output from the shoulder. The insufficient facilitation of the DM points toward a bilateral central activation deficit. These findings seem to be assigned to adaptive changes in the motor cortex as a consequence of chronic RCT, and the neuromuscular alteration of the DM should be considered when treating patients with RCT.
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机译：class =“ Heading”>背景 class =“ Para”>先前的表面肌电图（EMG）研究表明，慢性肩袖撕裂（RCT）可能与相邻肩部肌肉的激活改变有关。 RCT对肩部三角肌（DM）（肩部功能的关键肌肉）等中枢神经肌肉控制机制的影响尚未得到详细研究。 class =“ Heading” >材料和方法 class =“ Para”>该研究调查了DM的皮质脊髓兴奋性，以评估RCT对近端上肢肌肉中枢神经肌肉功能的影响。从单侧RCT患者的两侧经颅磁刺激DM诱发的运动诱发电位（MEP）均与健康对照组比较。 class =“ Heading”>结果 class =“ Para”>在患者中，DM的刺激反应曲线显示了静止时的双侧过度兴奋性和自愿激活期间的低兴奋性（ F ？=？3.82， P ？=？0.007）。 class =“ Heading”>结论 class =“ Para”> DM超兴奋性可能与在肩膀的感觉输出。 DM的促成作用不足，提示双侧中枢激活不足。这些发现似乎与慢性RCT导致运动皮层的适应性变化有关，在治疗RCT患者时应考虑DM的神经肌肉改变。
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