Institute of Movement Sciences and Sport Medicine, University of Geneva, Geneva, Switzerland.
Muscle Nerve. 2010 Dec;42(6):894-900. doi: 10.1002/mus.21776. Epub 2010 Oct 6.
We evaluated the use of direct muscle stimulation for quantifying quadriceps inactivation at different contraction levels as opposed to conventional twitch interpolation using nerve stimulation. Fourteen healthy volunteers were tested. Paired stimuli were delivered to the femoral nerve or to the quadriceps muscle belly during voluntary contractions ranging from 20% to 100% of maximum, and the amplitude of the superimposed doublet was quantified to investigate inactivation. Superimposed doublet for muscle and nerve stimulation, respectively between the range of 60% to 100% of maximum (e.g., at 100%, muscle stimulation was 14 ± 5 Nm and nerve stimulation was 15 ± 6 Nm). Despite higher current doses, muscle stimulation was associated with less discomfort than nerve stimulation (P < 0.05). Collectively, our data suggest that direct muscle stimulation could be used to assess quadriceps inactivation at maximal and quasi-maximal contraction levels as a valid alternative to motor nerve stimulation.
我们评估了直接肌肉刺激在不同收缩水平下定量测量股四头肌失活的用途，与使用神经刺激的传统颤搐插值相反。对 14 名健康志愿者进行了测试。在从 20%到 100%最大的自愿收缩期间，向股神经或股四头肌腹部递送成对刺激，量化叠加双脉冲的幅度以研究失活。在最大（例如，在 100%时）的 60%到 100%范围内，分别对肌肉和神经刺激进行叠加双脉冲（例如，在 100%时，肌肉刺激为 14 ± 5 Nm，神经刺激为 15 ± 6 Nm）。尽管电流剂量较高，但肌肉刺激引起的不适程度低于神经刺激（P < 0.05）。总的来说，我们的数据表明，直接肌肉刺激可用于评估最大和准最大收缩水平下的股四头肌失活，作为运动神经刺激的有效替代方法。
