Influence of Physical Activity on T1 and T2*Relaxation Times of Healthy Achilles Tendons at 3T
Influence of Physical Activity on T1 and T2*Relaxation Times of Healthy Achilles Tendons at 3T
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DOI：
10.1002/jmri.24525
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发表时间：
2015-01-01
影响因子：
4.4
通讯作者：
Syha, Roland
中科院分区：
文献类型：
--
作者：
Grosse, Ulrich;Springer, Fabian;Syha, Roland
目的评价跟腱不同部位的纵向（T1）和横向（T2*）松弛时间（插入，中间部分，和肌肉肌腱区域）在一个队列的受试者与可变肌腱应变活动，材料与方法采用超声心动图（ultrashortechotime，UTE）测量跟腱T1和T2* 弛豫时间，并与正常对照组比较。在3 T全身临床磁共振（MR）扫描仪上具有翻转角和回波时间变化的成像序列。12名健康志愿者的24条肌腱和9名健康休闲长跑运动员的18条肌腱结果运动员的T1值与对照组相比无显著性差异，但T2* 松弛时间显著延长（P < 0. 05（平均百分比增加15.7 +/- 4.9%; P=0.0181）。关于所研究的跟腱止点、中部和肌腱区的组间差异，跑步组中只有跟腱中部的T2* 值显著更长（平均百分比增加29.1 +/- 23.0%; P=0.0420）与对照组相比。跑步者的跟腱部分可能反映了肌腱微结构对重复肌腱拉紧活动的适应。J. Magn. Reson. Imaging 2015;41：193-201. (c)2013 Wiley Periodicals，Inc.
PurposeTo evaluate longitudinal (T1) and transverse (T2*) relaxation times at different Achilles tendon locations (insertion, mid-portion, and musculotendinous area) in a cohort of subjects with variable tendon straining activity, but without any signs of tendinopathy.Materials and MethodsT1 and T2* relaxation times of the Achilles tendon were measured using an ultrashort echo time (UTE) imaging sequence with flip angle and echo time variation on a 3T whole-body clinical magnetic resonance (MR) scanner. Twenty-four tendons of 12 healthy volunteers and 18 tendons of nine healthy recreational long-distance runners (average weekly running distance of 47.45.3 km) were enrolled.ResultsMean T1 values of the whole tendon showed no marked group differences, whereas T2* relaxation times of runners were significantly longer (mean percentage increase 15.7 +/- 4.9%; P=0.0181) compared to controls. Regarding group differences for the investigated insertional, mid-portion, and musculotendinous area of the Achilles tendon, only the mid-portion of the Achilles tendon in the running group presented significantly longer T2* values (mean percentage increase 29.1 +/- 23.0%; P=0.0420) in comparison to the control group.ConclusionProlonged T2* values especially in the mid-portion of the Achilles tendon of runners are likely to reflect an adaptation of the tendon microstructure to repetitive tendon straining activity. J. Magn. Reson. Imaging 2015;41:193-201. (c) 2013 Wiley Periodicals, Inc.