小腿三头肌低强度离心收缩与跟腱牵伸训练治疗跟腱挛缩的疗效对比研究

目的:对比常规康复基础上分别辅以小腿三头肌低强度离心收缩训练或跟腱牵伸训练对制动引起的跟腱挛缩的影响.方法 :选取踝关节骨折后制动引起跟腱挛缩的患者40例,随机将患者分为牵伸组和离心组,每组20例.2组均接受常规康复治疗,牵伸组在常规治疗基础上增加站斜板训练,离心组在常规治疗基础上增加小腿三头肌低强度离心收缩训练.比较...     

The effects of immobilization on the mechanical properties of the patellar tendon in younger and older men

Background

It remains unknown if inactivity changes the mechanical properties of the human patellar tendon in younger and older healthy persons. The purpose was to examine the effects of short-term unilateral immobilization on the structural and mechanical properties of the patellar tendon in older men and younger men, in vivo.

Methods

Eight older men and eight younger men underwent 14 days of unilateral immobilization. All individuals were assessed on both sides before and after the intervention. MRI was used to assess whole patellar tendon dimensions. The mechanical properties of the patellar tendon were assessed using simultaneous force and ultrasonographic measurements during isometric ramp contractions.

Findings

In older men, tendon stiffness [Pre: mean 2949 (SD 799) vs. Post: mean 2366 (SD 774) N mm^− 1, P < 0.01] and Young's Modulus [Pre: mean 1.2 (SD 0.3) vs. Post: mean 1.0 (SD 0.3) GPa, P < 0.05] declined with immobilization on the immobilized side. On the control side, tendon stiffness [Pre: mean 3340 (SD 1209) vs. Post: mean 2230 (SD 503), P < 0.01] and Young's Modulus [Pre: mean 1.5 (SD 0.4) vs. Post: mean 0.9 (SD 0.3) GPa, P < 0.05] also decreased with immobilization. In younger men, tendon stiffness [Pre: 3622 (SD 1760) vs. Post: mean 2910 (SD 1528) N mm^− 1, P < 0.01] and Young's Modulus [Pre: mean 1.7 (SD 1.1) vs. Post: mean 1.4 (SD 0.8) GPa, P < 0.05] decreased only on the immobilized side.

Interpretation

Short-term immobilization led to impaired mechanical properties of the patellar tendon on the immobilized side in both younger men and older men, which can influence the function of the muscle–tendon complex.