Shenton D W, Heppenstall R B, Chance B, Glasgow S G, Schnall M D, Sapega A A
J Orthop Res. 1986;4(2):204-11. doi: 10.1002/jor.1100040209.
This study used phosphorous nuclear magnetic resonance (31P-NMR) spectroscopy to examine the metabolic demand resulting from electrical muscle stimulation (EMS) applied to human skeletal muscle. For each of six subjects, the forearm flexor muscle group was monitored with 31P-NMR during both maximum voluntary and 6-s EMS-induced contractions. A simple protocol using a tourniquet was added in one subject to assess the role of blood flow in this model. Eight hertz (nontetanic) EMS showed less (p less than 0.025) depletion of phosphocreatine (36%) than did tetanic 70-Hz EMS (60%), voluntary isometric (66%), and voluntary isokinetic (68%). The results of the tourniquet studies suggested that the nontetanic EMS allowed relatively increased muscle blood flow and oxygen supply during contraction. Tetanic EMS provided a similar metabolic demand to that of conventional resistive exercise, as measured by 31P-NMR spectroscopy.
本研究采用磷核磁共振波谱（31P-NMR）来检测施加于人体骨骼肌的电肌肉刺激（EMS）所产生的代谢需求。对于六名受试者中的每一位，在最大自主收缩和6秒EMS诱发收缩期间，均使用31P-NMR对前臂屈肌肌群进行监测。在一名受试者中增加了一个使用止血带的简单方案，以评估血流在此模型中的作用。8赫兹（非强直）的EMS显示磷酸肌酸消耗（36%）比强直的70赫兹EMS（60%）、自主等长收缩（66%）和自主等速收缩（68%）更少（p<0.025）。止血带研究结果表明，非强直EMS在收缩期间允许相对增加的肌肉血流和氧气供应。通过31P-NMR波谱测量，强直EMS产生的代谢需求与传统抗阻运动相似。
