Wahl P, Hein M, Achtzehn S, Bloch W, Mester J
Institute of Training Science and Sport Informatics, German Sport University Cologne, Germany.
J Musculoskelet Neuronal Interact. 2015 Mar;15(1):53-9.
The purpose of the present study was to evaluate the effects of superimposed electromyostimulation (E) during cycling on myokines and markers of muscle damage, as E might be a useful tool to induce a high local stimulus to skeletal muscle during endurance training without performing high external workloads.
13 subjects participated in three experimental trials each lasting 60 min in a randomized order. 1) Cycling (C), 2) Cycling with superimposed E (C+E) and 3) E. Interleukin-6 (IL-6), brain-derived neurotrophic factor (BDNF), creatine kinase (CK) and myoglobin were determined before (pre) and 0', 30', 60', 240' and 24h after each intervention.
Only C+E caused significant increases in levels of CK and myoglobin. BDNF and IL-6 significantly increased after C and C+E, however increases for IL-6 were significantly higher after C+E compared to C.
The present study showed that superimposed E during cycling might be a useful tool to induce a high local stimulus to skeletal muscle even when performing low to moderate external workloads. This effect might be due the activation of additional muscle fibers and mild eccentric work due to the concomitant activation of agonist and antagonist. However the higher load to skeletal muscle has to be taken into account.
本研究的目的是评估骑行过程中叠加肌电刺激（E）对肌动蛋白和肌肉损伤标志物的影响，因为E可能是一种在耐力训练期间对骨骼肌施加高局部刺激的有用工具，而无需施加高外部负荷。
13名受试者以随机顺序参加三项实验性试验，每项试验持续60分钟。1）骑行（C），2）叠加E的骑行（C + E）和3）E。在每次干预前（预）以及干预后0'、30'、60'、240'和24小时测定白细胞介素-6（IL-6）、脑源性神经营养因子（BDNF）、肌酸激酶（CK）和肌红蛋白。
只有C + E导致CK和肌红蛋白水平显著升高。BDNF和IL-6在C和C + E后显著增加，然而与C相比，C + E后IL-6的增加显著更高。
本研究表明，骑行过程中叠加E可能是一种有用的工具，即使在进行低至中等外部负荷时，也能对骨骼肌施加高局部刺激。这种效果可能是由于额外肌纤维的激活以及由于激动剂和拮抗剂的同时激活而产生的轻度离心运动。然而，必须考虑到对骨骼肌的更高负荷。
