School of Allied Health Sciences, Menzies Health Institute Queensland, Griffith University, Australia.
School of Health, Medical and Applied Sciences, Central Queensland University, Australia.
J Sci Med Sport. 2018 May;21(5):473-478. doi: 10.1016/j.jsams.2017.09.016. Epub 2017 Sep 28.
The tendon conditioning effect is transient, but the time course of recovery from conditioning is not known. This study examined the time-course recovery of three-dimensional (3D) Achilles tendon (AT) deformation immediately following a standardised AT conditioning protocol.
Randomised crossover.
Ten healthy male adults (age: 24±5 years; height: 175.8±4.1cm; body mass: 78.4±6.3kg) attended the laboratory on 6 occasions. ATs were scanned using freehand 3D ultrasound during a 50% maximal voluntary isometric contraction (MVIC) of the plantarflexors immediately prior to and following the conditioning protocol (10×25s plantarflexion contractions at 50% MVIC), and then at either 15, 30, 60, 90 or 120min post-conditioning, randomised by session.
Free AT longitudinal strain was significantly increased from 3.13±0.19% pre-conditioning to 7.49±0.20% immediately post-conditioning and was accompanied by a corresponding reduction in free AT transverse strain from -5.35±0.48% to -10.16±0.49% (p<0.001). There were no significant differences in free AT longitudinal or transverse strains at 60min relative to 0min post-conditioning, or between pre-conditioning strains and strains measured at 2h (p>0.05).
The free AT undergoes a creep response during conditioning which is recoverable within 2h following conditioning. Recovery from conditioning has the potential to be a source of error during in vivo measurement of AT mechanical properties. The time window in which the free AT longitudinal and transverse strains could be achieved without a large confounding effect of creep recovery is 0-60min post-conditioning.
肌腱调理效果是短暂的，但调理后的恢复时间尚不清楚。本研究检查了标准化跟腱调理方案后，三维（3D）跟腱（AT）变形立即恢复的时间过程。
随机交叉。
10 名健康成年男性（年龄：24±5 岁；身高：175.8±4.1cm；体重：78.4±6.3kg）在实验室参加了 6 次。在足底屈肌 50%最大自主等长收缩（MVIC）之前和之后，使用自由手 3D 超声扫描 AT，然后在调理方案（50%MVIC 下进行 10×25s 跖屈收缩）后 15、30、60、90 或 120min 时随机按会议进行，随机分组。
自由 AT 纵向应变从调理前的 3.13±0.19%显著增加到调理后的 7.49±0.20%，同时自由 AT 横向应变从-5.35±0.48%减少到-10.16±0.49%（p<0.001）。与调理后 0min 相比，调理后 60min 时自由 AT 纵向或横向应变无显著差异，或与预调理应变和 2h 测量应变无显著差异（p>0.05）。
自由 AT 在调理过程中发生蠕变反应，调理后 2h 内可恢复。调理后的恢复有可能成为体内测量 AT 力学特性时的一个误差源。在没有明显的蠕变恢复干扰的情况下，自由 AT 纵向和横向应变可获得的时间窗口是调理后 0-60min。
