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The effect of vocalization on spinal excitation as measured by H wave

机译：H波测量发声对脊柱兴奋的影响

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摘要

The aim of this study was to measure the H wave by using voice-activated electromyography to reveal how different speech outputs affect the spinal cord segments innervating the lower limb skeletal muscles. In 21 healthy adults (16 men and 5 women) seated in a semi-reclined position, the H wave was recorded using surface electrodes over the soleus muscle of the pivot leg after stimulating the tibial nerve. The amplitude of the H wave was 1.02 SD 0.69 mV under the prevocalization condition; 1.51 SD 0.76 mV under the submaximal vocalization condition (>= 60-<80 dB); and 1.13 SD 0.59 mV under the maximal vocalization condition (>= 80 dB), demonstrating that the amplitude generated with submaximal vocalization was significantly higher than the control and maximal vocalization conditions. Mean voice intensity was around 69 dB for submaximal vocalization and around 91 dB for maximal vocalization. Submaximal vocalization results in a higher H wave amplitude than the control condition, thus suggesting increased spinal cord excitation, which may be important for initiating activities of daily living (e.g., lifting objects) or mobility (e.g., moving from a sitting to a standing position).
机译：这项研究的目的是通过使用声控肌电图来测量H波，以揭示不同的语音输出如何影响支配下肢骨骼肌的脊髓节段。在21位健康的成年人（16位男性和5位女性）中半躺着坐着，在刺激胫神经后，使用枢轴腿比目鱼肌上方的表面电极记录了H波。在发声条件下，H波的振幅为1.02 SD 0.69 mV;在次最大发声条件下（> = 60- <80 dB）1.51 SD 0.76 mV;在最大发声条件（> = 80 dB）下的1.13 SD 0.59 mV，表明次最大发声产生的幅度明显高于对照和最大发声条件。对于次最大发声，平均语音强度约为69 dB，对于最大发声，平均语音强度约为91 dB。次最大发声会导致H波振幅高于控制条件，从而表明脊髓兴奋性增强，这对于启动日常生活活动（例如，举起物体）或活动性（例如，从坐姿到站立姿势）可能很重要）。

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