Early detection of exercise-induced muscle damage using elastography
Early detection of exercise-induced muscle damage using elastography
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DOI：
10.1007/s00421-017-3695-9
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发表时间：
2017-10-01
影响因子：
3
通讯作者：
Guilhem, Gael
中科院分区：
文献类型：
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作者：
Lacourpaille, Lilian;Nordez, Antoine;Guilhem, Gael
目的探讨离心性运动后30min(30min)肌肉剪切模量值的增加是否能反映运动后48h(48h)力亏缺的大小。四组受试者分别在低负荷或高负荷下重复偏心屈肘或伸膝。结果偏心训练48h后，屈肘和伸膝肌的峰值扭矩均显著降低(P均<0.001)。在30min时，低负荷(+153.9+/-192.4%，P<；0.001)和高负荷(+70.5%+/-44.3%，P<；0.001)屈肘肌群的剪切模量值显著增加。同样，膝关节伸肌在低负荷(+26.7%+/-19.1%，P<；0.001)和高负荷(+79.4%+/-67.1%，P<；0.001)下的剪切模数增加。肘屈肌(r=-0.80)和膝关节伸肌(r=-0.82)的峰值扭矩在30min时的相对增大与48h时的峰值扭矩的相对减小显著相关。进一步的分析表明，二头肌和股直肌更容易受到肌肉损伤的影响，而不是它们的协同作用。结论本研究表明，损伤运动后30min测量的肌肉剪切模数的增加反映了48H处的峰值扭矩的降低，因此，为教练员和临床医生提供了一种有用的工具，以非侵入性地估计损伤运动引起的肌肉损伤的量。
Purpose This study aimed to determine whether an increase in muscle shear modulus measured 30 min after eccentric exercise (30 min) reflects the magnitude of force deficit measured 48-h post-exercise (48 H).Methods A total of 53 healthy participants were distributed in five groups. Four groups performed either repeated eccentric elbow flexions or knee extensions at either a low or high load. A fifth group performed repeated concentric elbow flexions (control load).Results A significant decreased peak torque was found for elbow flexors and knee extensors 48 h after the eccentric exercises (all P values < 0.001). A significant increase in shear modulus was found at 30 min for the elbow flexors for low (+70.5 +/- 44.3%, P < 0.001) and high load (+153.9 +/- 192.4%, P < 0.001). Similarly, the shear modulus of knee extensors increased for low (+26.7 +/- 19.1%, P < 0.001) and high load (+79.4 +/- 67.1%, P < 0.001). The relative increase in shear modulus measured at 30 min was significantly correlated to the relative decrease in peak torque measured at 48 H for both elbow flexors (r = -0.80) and knee extensors (r = -0.82). A further analysis suggested that biceps brachii and rectus femoris were more affected by muscle damage than their synergists.Conclusion This study shows that an increase in muscle shear modulus measured 30 min after a damaging exercise reflects the decrease in peak torque measured at 48 H. Shear modulus may therefore, provide a useful tool for coaches and clinicians to non-invasively estimate the amount of muscle damage induced by a damaging exercise.