Abstract：
Objectives. Phase angle muscle imaging has been proposed by phase angle electrical impedance tomography (ΦEIT) under electrical muscle stimulation (EMS) for long-term monitoring of muscle quality improvement, especially focusing on calf muscles.Approach. In the experiments, twenty-four subjects are randomly assigned either to three groups: control group (CG,n= 8), low voltage intensity of EMS training group (LG,n= 8), and optimal voltage intensity of EMS training group (OG,n= 8).Main results. From the experimental results, phase angle distribution imagesФare cleared reconstructed by ФEIT as four muscle compartments over five weeks experiments, which are called theM1muscle compartments composed of gastrocnemius muscle,M2muscle compartments composed of soleus muscle,M3muscle compartments composed of tibialis-posterior muscle, flexor digitorum longus muscle, and flexor pollicis longus muscle, andM4muscle compartment composed of the tibialis anterior muscle, extensor digitorum longus muscle, and peroneus longus muscle.Фis inversely correlated with age, namely theФdecreases with increasing age. A paired samplest-test was conducted to elucidate the statistical significance of spatial-mean phase angle in all domain <Ф>Ωand in each muscle compartment <Ф>Mwith reference to the conventional phase angle Ф by bioelectrical impedance analysis, muscle grey-scaleGmuscleby ultrasound, and maximal dynamic strengthSMaxby one-repetition maximum test.Significance. From thet-test results, <Ф>Ωhave good correlation with Ф andSMax. In the OG, <ФW5>Ω,ФW5, and (SMax)W5were significantly higher than in the first week (n= 8,p< 0.05). A significant increase in the phase angle of bothM1andM4muscle compartments is observed after five weeks in LG and OG groups. Only the OG group shows a significant increase in the phase angle ofM2muscle compartment after five weeks. However, no significant changes in the spatial-mean phase angle ofM3compartment are observed in each group. In conclusion, ФEIT satisfactorily monitors the response of each compartment in calf muscle to long-term EMS training.
摘要：
相角肌肉成像已经提出了在EMS下通过相角电阻抗断层成像来长期监测肌肉质量的改善，尤其是关注小腿肌肉.在实验中,将24名受试者随机分为三组：对照组(CG，n=8),低压强度EMS训练组(LG，n=8),和EMS训练组的最佳电压强度(OG，n=8)。从实验结果来看,相角分布图像通过ΦEIT清除重建为四个肌肉隔室，经过五周的实验，它们被称为由腓肠肌组成的M1，M2由比目鱼组成，M3由胫骨后肌组成，趾长屈肌,和长屈肌，M4由胫骨前肌组成，趾长伸肌,还有PeronusLongus.与年龄成反比,即随着年龄的增长而减少。通过生物电阻抗分析，参照常规相位角Φ，进行了成对样本t检验，阐明了空间平均相位角在各域<Φ>Ω和各肌室<Φ>M中的统计显著性，肌肉灰阶肌肉通过超声波，和最大动态强度SMax通过一次重复最大测试。从t检验结果来看，<Φ>Ω与Φ和SMax具有良好的相关性。在OG中，<ΦW5>Ω,ΦW5和(SMax)W5显著高于第一周(n=8,p<0.05)。在LG和OG组中，五周后观察到M1和M4肌肉区室的相位角均显着增加。只有OG组在五周后显示M2的相位角显著增加。然而,各组M3的空间平均相位角均无明显变化.总之,ΦEIT可以令人满意地监测小腿肌肉中每个隔室对长期EMS训练的反应。
