等长收缩干预肌腱病的作用机制研究进展

Research Progress on the Mechanisms of Isometric Contraction Intervention in Tendinopathy

摘要: 等长收缩因其快速镇痛和良好耐受性，已成为肌腱病管理的重要负荷策略。本文围绕疼痛调控的中枢与外周机制、力学信号与肌腱适应、中枢适应与负荷再分配三个维度，系统梳理等长收缩的作用机制研究进展。在中枢与外周层面，等长收缩通过下调皮质脊髓抑制、激活弥漫性伤害抑制性控制系统，发挥中枢镇痛效应，同时改善外周致痛微环境，阻断神经–血管长入的恶性循环。在力学信号层面，持续张力通过差异信号驱动ERK/Akt促合成代谢通路，促进I型胶原合成与肌腱刚度重建。在中枢适应层面，等长训练可诱导运动皮质良性重塑，优化肌肉激活模式，实现负荷再分配。本文进一步分析了镇痛效应的部位特异性、长期疗效的非特异性、剂量–效应关系不明及机制链条断裂等现存争议，并提出未来研究方向，以期为肌腱病的精准力学康复提供理论支撑。

Abstract: Isometric contraction has emerged as an important loading strategy in the management of tendinopathy, owing to its rapid analgesic effect and favorable tolerability. This review systematically summarizes the research progress on its underlying mechanisms across three dimensions: central and peripheral mechanisms of pain modulation, mechanical signaling and tendon adaptation, and central adaptation with load redistribution. At the central and peripheral level, isometric contraction exerts analgesic effects by downregulating corticospinal inhibition and activating the diffuse noxious inhibitory control system, while improving the peripheral nociceptive microenvironment and interrupting the vicious cycle of neurovascular ingrowth. At the mechanical signaling level, sustained tension drives ERK/Akt-mediated anabolic pathways through differential cellular responses, promoting type I collagen synthesis and restoration of tendon stiffness. At the central adaptation level, isometric training induces beneficial corticomotor reorganization, optimizes muscle activation patterns, and facilitates load redistribution away from the pathological tendon region. This review further analyzes existing controversies, including the site-specificity of analgesia, the non-specificity of long-term outcomes, the unclear dose-response relationship, and the fragmented mechanistic chain, and proposes future research directions, with the aim of providing theoretical support for precision mechanotherapy in tendinopathy rehabilitation.