Effect of stretching training on the viscoelastic properties of human tendon structures in vivo
Effect of stretching training on the viscoelastic properties of human tendon structures in vivo
复制标题
DOI：
10.1152/japplphysiol.00658.2001
复制
发表时间：
2002-02-01
影响因子：
3.3
通讯作者：
Fukunaga, T
中科院分区：
文献类型：
--
作者：
Kubo, K;Kanehisa, H;Fukunaga, T
本研究的目的是研究拉伸训练是否会改变体内人体肌腱结构的粘弹性。8名男子进行了为期3周的拉伸训练。在拉伸训练前后，通过超声直接测量腓肠肌内侧肌腱和腱膜的伸长率，同时受试者进行坡道等距足底屈曲至任意最大值，然后进行坡道放松。在上升阶段，估计肌肉力（Fm）与肌腱伸长(L)之间的关系拟合为线性回归，其斜率定义为肌腱结构的刚度。在上升阶段，计算Fm-L回路内面积与曲线下面积的百分比，作为表示滞后的指标。为了评估灵活性，以5度/秒的恒定速度从0度（解剖位置）被动拉伸到25度背屈时测量足底屈肌的被动扭矩。将被动转角曲线线性部分在拉伸过程中的斜率定义为柔度指数。拉伸训练后柔韧性指数明显下降（-13.4 +/- 4.6%）。另一方面，拉伸训练没有产生明显的刚度变化，但显著降低迟滞从19.9 +/- 11.7到12.5 +/- 9.5%。目前的结果表明，拉伸训练影响肌腱结构的黏性，但不影响弹性。
The purpose of this study was to examine whether stretching training altered the viscoelastic properties of human tendon structures in vivo. Eight men performed the stretching training for 3 wk. Before and after the stretching training, the elongation of the tendon and aponeurosis of medial gastrocnemius muscle was directly measured by ultrasonography while the subjects performed ramp isometric plantar flexion up to the voluntary maximum, followed by a ramp relaxation. The relationship between the estimated muscle force (Fm) and tendon elongation (L) during the ascending phase was fitted to a linear regression, the slope of which was defined as stiffness of tendon structures. The percentage of the area within the Fm-L loop to the area beneath the curve during ascending phase was calculated as an index representing hysteresis. To assess the flexibility, the passive torque of the plantar flexor muscles was measured during the passive stretch from 0degrees (anatomic position) to 25degrees of dorsiflexion with a constant velocity of 5degrees/s. The slope of the linear portion of the passive torque-angle curve during stretching was defined as flexibility index. Flexibility index decreased significantly after stretching training (-13.4 +/- 4.6%). On the other hand, the stretching training produced no significant change in stiffness but significantly decreased hysteresis from 19.9 +/- 11.7 to 12.5 +/- 9.5%. The present results suggested that stretching training affected the viscosity of tendon structures but not the elasticity.