Passive muscle stiffness is correlated with the intramuscular adipose tissue in young individuals
Passive muscle stiffness is correlated with the intramuscular adipose tissue in young individuals
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DOI：
10.1007/s00421-023-05137-z
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发表时间：
2023-01-13
影响因子：
3
通讯作者：
Akima, Hiroshi
中科院分区：
文献类型：
--
作者：
Yoshiko, Akito;Ando, Ryosuke;Akima, Hiroshi
目的探讨肌内脂肪组织与肥胖的关系。（IntraMAT）和肌肉僵硬（被动和机械）和延长，假设（1）被动肌肉僵硬与IntraMAT含量呈负相关，（2）IntraMAT含量与被动背屈时肌肉僵硬度和肌束长度的机械变化呈负相关。（20.3 +/- 1.3岁）参与了本研究。在内侧腓肠肌（MG）最厚点进行轴向T1加权磁共振成像，以测量IntraMAT横截面积（CSA）和肌肉组织CSA（单位：cm（2））。使用超声剪切波弹性成像和B型成像测量三个踝关节角度（即跖屈15度（PF 15）、中立位0度（NP）和背屈15度（DF 15））的剪切波速度（SWV）和肌束长度，作为肌肉刚度（单位; m/s）和延长（单位; cm）的参数。结果IntraMAT CSA与DF 15时的绝对SWV之间存在相关性（r = -0. 47，P <0. 05）。此外，观察到IntraMAT CSA与SWV和从NP到DF的束长度变化之间的关系15（r =-0.47和r = 0.59，P < 0.05）;而肌束长度的变化与肌SWV的变化无相关性结论IntraMAT CSA与被动肌强直之间存在生物力学和/或生理学相关性。
PurposeWe investigated the relationship between intramuscular adipose tissue (IntraMAT) and muscle stiffness (passive and mechanical) and lengthening in young individuals, hypothesizing that (1) passive muscle stiffness is negatively correlated with the IntraMAT content, and (2) the IntraMAT content is negatively correlated with mechanical changes in muscle stiffness and fascicle length during passive dorsiflexion.MethodsTwenty men and women (20.3 +/- 1.3 years) participated in this study. Axial T1-weighted magnetic resonance imaging was performed at the thickest point of the medial gastrocnemius (MG) to measure the IntraMAT cross-sectional area (CSA) and muscle tissue CSA (units; cm(2)). The shear wave velocity (SWV) and fascicle length at the three ankle joint angles, namely 15 degrees with plantarflexion (PF15), 0 degrees with neutral position (NP), and 15 degrees with dorsiflexion (DF15), were measured as parameters of muscle stiffness (unit; m/s) and lengthening (unit; cm) using ultrasound shear wave elastography and B-mode imaging. We further calculated the changes in SWV and fascicle length from PF15 to NP and from NP to DF15 as mechanical muscle stiffness and lengthening, respectively.ResultsThere was a relationship between IntraMAT CSA and absolute SWV at DF15 (r = - 0.47, P < 0.05). Further, a relationship was observed between IntraMAT CSA and change in SWV and fascicle length from NP to DF15 (r = - 0.47 and r = 0.59, P < 0.05); whereas no relationship was observed between changes in fascicle length and muscle SWV (r = - 0.23, P = 0.33).ConclusionThese results may indicate biomechanical and/or physiological associations between IntraMAT CSA and passive muscle stiffness.