Failed excitability of spinal motoneurons induced by prolonged running exercise
Failed excitability of spinal motoneurons induced by prolonged running exercise
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DOI：
10.1152/jn.00903.2006
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发表时间：
2007-01-01
影响因子：
2.5
通讯作者：
Perrey, S.
中科院分区：
文献类型：
--
作者：
Racinais, S.;Girard, O.;Perrey, S.
杨文龙，杨文龙，杨文龙.长时间跑步运动引起脊髓运动神经元兴奋性下降。J Neurophysiol 97：596-603，2007.首次发表于2006年11月8日; doi：10.1152/ jn.00903.2006。本研究的主要目的是探讨长时间运动活动引起的H反射和V波反应（脊髓环路特性）的调制。第二个目的是比较连续和间歇运行模式之间的中枢疲劳的发展。11名男性随机进行了两个90分钟的跑步练习，连续（CONT，第一解释阈值）或间歇（INT，150秒，速度比CONT/30秒的恢复速度高20%）。分别于运动前、运动后5 min和30 min进行足底屈肌神经肌肉测试（包括静息时的M波和H反射以及最大随意收缩（MVC）时的M波和V波）。在MVC期间，从运动前到运动后5分钟和30分钟（分别为-11%和-9%），比目鱼肌的RMS/M比（分别为-11%和-13%）和V/M比（分别为-19%和-37%）显著降低（P < 0.05）。安静时，H/M比值从运动前到运动后5分钟和30分钟也显著降低（P < 0.001）（分别为-61%和-55%）。最后，没有差异的脊髓回路属性的改变之间的CONT和INT。总之，关于H-反射和V-波的结果表明，第一次调制脊髓回路属性后，长时间运行。
Racinais S, Girard O, Micallef JP, Perrey S. Failed excitability of spinal motoneurons induced by prolonged running exercise. J Neurophysiol 97: 596-603, 2007. First published November 8, 2006; doi:10.1152/ jn.00903.2006. The main purpose of this study was to investigate the modulations in H-reflex and V-wave responses (spinal loop properties) induced by prolonged locomotion activities. The second purpose was to compare the development of central fatigue between continuous and intermittent running modes. Eleven males randomly performed two 90-min running exercises either continuously (CONT, first ventilatory threshold) or intermittently (INT, 150 s at a velocity 20% higher than that during CONT/30 s of recovery). Neuromuscular tests of the plantar flexors [including M-wave and H-reflex at rest and M-wave and V-wave during maximal voluntary contraction (MVC)] were performed before and 5 and 30 min after the running exercises. During MVC, the torque significantly decreased (P < 0.05) from preexercise to 5 and 30 min postexercise (-11 and -9%, respectively), as did the RMS/M ratio (-11 and -13%, respectively) and the V/M ratio (-19 and -37%, respectively) for the soleus muscle. At rest, the H/M ratio also decreased significantly (P < 0.001) from preexercise to 5 and 30 min postexercise (-61 and -55%, respectively). Last, no difference in the alteration of spinal loop properties was noted between CONT and INT. In conclusion, the results regarding H-reflex and V-wave suggest for the first time a modulation in spinal loop properties after prolonged running.