(Originals)Influence of Pre-contraction of an Agonist Muscle on Readiness Potential(RP)
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概要
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FUMOTO, M., NISHIHIRA, Y., HATTA, A. and KANEDA, T.,Influence of Pre-contraction of an Agonist Muscle on Readiness Potential(RP). Adv. Exerc. Sports Physiol., Vol.6, No.2 pp41-50, 2000. This study investigated the influence of sustained contraction (pre-contraction) on readiness potential (RP) and contingent negative variation (CNV) to evaluate the relationship between both potentials. Subjects were 20 normal volunteers. For the RP task, the subject spontaneously executed isometric wrist flexion movement as fast as possible (main action) following the establishment of a resting or contraction condition. For the CNV task, the subject made a movement similar to that in the RP task when guided by a warning (WS) and responsee signal (RS) (reaction). The Beritschaftspotential (BP), which was the carly component of the RP, and the late component of the CNV significantly decreased in the contraction condition. The attenuation of the BP was more obvious than that of the CNV. HOwever the negative slope (Ns') which was the late component of the RP was similar under both conditions at all electrodes. The modulation of the RP and CNV under the contraction condition could be divided into 4 patterns. The resultant force trajectory with the main action and reaction was also examined. For the RP task, the peak ampitude was similar under both conditions, but for the CNV task the amplitude was higher under the contraction condition. For both the PR and CNV tasks, the slope to the peak was similar under both conditions. For the CNV task, the EMG RT was shortened under the contraction condition. These results suggest that the attenuation of the late component of the CNV and RP is not related to the resultant motor parameters and to the psychological process, but to the pre-contraction preceding the motor activity.
著者
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Fumoto Masaki
Doctral Program in Health and sport Sciences,University of Tsukuba
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Nishihara Yoshiaki
Institute of Health and sport Sciences,University of Tsukuba
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Hata Arihiro
Institute of Health and sport Sciences,University of Tsukuba
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Kaneda Takeshi
Doctral Program in Health and sport Sciences,University of Tsukuba
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Fumoto Masaki
Doctral Program In Health And Sport Sciences University Of Tsukuba
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Nishihira Yoshiaki
Institute Of Health & Sports Sciences University Of Tsukuba
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Hata Arihiro
Institute Of Health And Sport Sciences University Of Tsukuba
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Kaneda Takeshi
Doctral Program In Health And Sport Sciences University Of Tsukuba
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Nishihara Yoshiaki
Institute Of Health And Sport Sciences University Of Tsukuba
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Hatta Arihiro
Institute of Health and sport Sciences,University of Tsukuba
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