Nishihira Y, Araki H, Funase K, Imanaka K
Division of Physiology, University of Tsukuba, Ibaraki, Japan.
J Sports Med Phys Fitness. 1997 Mar;37(1):65-71.
We examined which components of somatosensory evoked potentials (SEP) were modulated during the voluntary movement of stimulated fingers and discuss our findings with respect to the decrease in SEPs in terms of both centrifugal and centripetal mechanisms.
The study was performed in the Laboratory of Physiology, Institute of Health and Sport Sciences, University of Tsukuba. Experiments were performed on 10 healthy young male subjects, aged 19-21 years. All subjects were right-handed and were free of neurological disease.
We found that N20-P25 (P22 at frontal area) -N35-(N30 at frontal) P45 (P40 at frontal area) components at the F3, the C3' and the P3 were consistently evoked, but N35 was increased at P3 and N30 attenuation at F3 during a sustained voluntary movement. Furthermore, the present experiments showed that frontal N30 was markedly decreased during a sustained voluntary movement. We also found that all SEPs components, except for parictal N35, were significantly decreased during sustained voluntary movement tasks.
We concluded that the suppression of SEPs appeared to be due to the interaction of both centrifugal and centripatal mechanisms. Namely, in a particular type of movement task, more prenounced afferent mechanisms may contribute to the decrease in SEPs, while in the other types of tasks, more pronounced afferent activities may contribute to the decrease in SEPs.
我们研究了在受刺激手指的自主运动过程中体感诱发电位（SEP）的哪些成分受到调制，并从离心和向心机制两方面就SEP的降低情况讨论我们的研究结果。
该研究在筑波大学健康与体育科学研究所生理学实验室进行。对10名年龄在19 - 21岁的健康年轻男性受试者进行了实验。所有受试者均为右利手且无神经系统疾病。
我们发现，在F3、C3'和P3处可稳定引出N20 - P25（额叶区域为P22）-N35-（额叶为N30）P45（额叶区域为P40）成分，但在持续自主运动期间，P3处的N35增加，F3处的N30衰减。此外，本实验表明在持续自主运动期间额叶N30明显降低。我们还发现，在持续自主运动任务期间，除顶叶N35外，所有SEP成分均显著降低。
我们得出结论，SEP的抑制似乎是由于离心和向心机制的相互作用。也就是说，在特定类型的运动任务中，更明显的传入机制可能导致SEP降低，而在其他类型的任务中，更明显的传入活动可能导致SEP降低。
