Regional differences in hamstring muscle damage after a marathon
Regional differences in hamstring muscle damage after a marathon
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DOI：
10.1371/journal.pone.0234401
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发表时间：
2020-06-25
期刊：
影响因子：
3.7
通讯作者：
Hirose, Norikazu
中科院分区：
文献类型：
--
作者：
Higashihara, Ayako;Nakagawa, Kento;Hirose, Norikazu
先前的研究表明，马拉松跑会导致下肢肌肉损伤。本研究旨在通过横向弛豫时间（T-2）加权磁共振成像（MRI）检查马拉松后腘绳肌损伤的肌间和肌内差异。20名健康的大学生马拉松运动员（15名男性）被招募用于本研究。在马拉松前（PRE）和后1天（D1）、3天（D3）和8天（D8）进行T-2-MRI，计算每个腘绳肌远端、中间和近端部位的T（2）值。结果表明，在T2变化中没有观察到显著的肌间差异，并且，无论肌肉如何，远端和中间部位的T2值在D1和D3显著增加，并在D8恢复，尽管近端部位的这些值保持不变。D1时股二头肌长头远端和中部的T（2）显著增加（分别为p= 0.030和p = 0.004）和D3（分别为p= 0.007和p = 0.041），D1时远端股二头肌短头（p= 0.036），D1时远端半腱肌（p= 0.047）和D3（p= 0.010），D1时中半腱肌（p= 0.005）、D1（p= 0.008和p = 0.040）和D3（p= 0.002和p = 0.018）的半膜肌远端和中部。这些结果表明，腿筋肌肉的远端和中间部位更容易受到损伤引起的运行一个完整的马拉松。训练集中在腿筋肌肉的远端和中间部位，可能对改善长时间跑步后的恢复策略更有用。
Previous studies suggest that marathon running induces lower extremity muscle damage. This study aimed to examine inter- and intramuscular differences in hamstring muscle damage after a marathon using transverse relaxation time (T-2)-weighted magnetic resonance images (MRI). 20 healthy collegiate marathon runners (15 males) were recruited for this study. T-2-MRI was performed before (PRE) and at 1 (D1), 3 (D3), and 8 days (D8) after marathon, and the T(2)values of each hamstring muscle at the distal, middle, and proximal sites were calculated. Results indicated that no significant intermuscular differences in T(2)changes were observed and that, regardless of muscle, the T(2)values of the distal and middle sites increased significantly at D1 and D3 and recovered at D8, although those values of the proximal site remained constant. T(2)significantly increased at distal and middle sites of the biceps femoris long head on D1 (p= 0.030 andp= 0.004, respectively) and D3 (p= 0.007 andp= 0.041, respectively), distal biceps femoris short head on D1 (p= 0.036), distal semitendinosus on D1 (p= 0.047) and D3 (p= 0.010), middle semitendinosus on D1 (p= 0.005), and distal and middle sites of the semimembranosus on D1 (p= 0.008 andp= 0.040, respectively) and D3 (p= 0.002 andp= 0.018, respectively). These results suggest that the distal and middle sites of the hamstring muscles are more susceptible to damage induced by running a full marathon. Conditioning that focuses on the distal and middle sites of the hamstring muscles may be more useful in improving recovery strategies after prolonged running.