@article{oai:mie-u.repo.nii.ac.jp:00002950,
 author = {脇田, 裕久 and Wakita, Hirohisa and 八木, 規夫 and Yagi, Norio and 長井, 健二 and Nagai, Kenji and 水谷, 四郎 and Mizutani, Shiro and 矢部, 京之助 and Yabe, Kyonosuke},
 journal = {三重大学教育学部研究紀要. 自然科学},
 month = {Mar},
 note = {application/pdf, Some reports on sex difference in physical fitness have been published by many investigators. These reports have pointed out that sex difference were found on some factors of physical fitness, but rarely on the function of nervous system. The purpose of this study is to investigate sex difference in the rate of appearance in premotion silent period (p. s. p.) which appears just before a rapid voluntary movement. Sixty-six healthy males and females ages 18-25 years were subjected to a series of experiment. Subjects were asked to exert muscle strength at 15 to 20% of their maximum elbow extension strength for two to five seconds. Then they were requested to extend their elbow joint responding to a flashing lamp as quickly as possible. The EMG activities of triceps brachii and biceps brachii were recorded by bipolar surface electrodes. The three conditions of  "complete p. s. p. ", "incomplete p. s. p. " and "without p. s. p･" were identified from the EMG recordings. The force curve of elbow extension was simultaneously recorded using a resistance strain gauge transducer, and the mechanogram was analyzed on the following items: A) The time from the signal to the onset of force curve (premotor time), B) The time from the onset to the peak of force curve (motor time) The followlng results were obtained: 1) The mean values of the rate of appearancein complete p. s. p. were 37･7% in male and 31.7% in female on the right elbow extension, and 32.4% and 28･0% on the left elbow extension, respectively. No significant sex difference was found. 2) The mean values of the rate of appearance in total p. s. p. (complete p. s. p. + incomplete p. s. p.) were 57.4% in male and 51･8% in female on the right elbow extension, and 52.3% and 51.2% on the left elbow extension, respectively. No significant sex difference was found. 3) The mean values of the premotor time were 199msecin male and 200msec in female on the right elbow extension, and 203msec and 208msec on the left elbow extension, respectively. No significant sex difference was found. 4) The mean values of the motor time were lO7msec in male and 125msec in female on the right elbow extension, and 110msec and 134msec on the left elbow extension, respectively. Significant sex difference was found at a level of 1% on each elbow extension. The fact that no sex difference was observed on the rate of appearance in premotion silent period and on the premotor time would suggest that there are no sex difference on such a function of the nervous system., 主動筋に軽度の随意的な緊張を与えた状態から急速に反応動作をおこすと、動作に先行して主動筋に Silent period が出現する。本実験は、肘関節伸展動作を用いて、この動作前 silent period 出現率および動作開始時間･動作時間における男女差の有無を究明しようとした。被検者は、健常な18～25オまでの男女大学生、各々33名、合計66名である。本実験結果は、次のようである。 1) P.S.P. 出現率について a. 右肘関節伸展動作時に出現する p.s.p. 出現率は、 complete p.s.p. 試行で男子37.7% (S.D. 27.93%)、女子31.7% (S.D. 29.01%)、incomplete p.s.p. 試行で男子19.5% (S.D. 10.26%)、女子21･5% (S.D. 12･34%)、total p.s.p. 試行で男子57.4% (S.D. 27.59%)、女子51.8% (S.D. 30.20%) であり、いずれの試行においても男女間に有意な差はみとめられなかった。 b. 左肘関節伸展動作時に出現する p.s.p. 出現率は、complete p.s.p. 試行で男子32.4% (S.D. 30.34%)、女子28.0% (S.D. 26.10%)、incomplete p.s.p. 試行で男子20.0% (S.D. 13.05%)、女子23･2% (S.D. 12.80%)、total p.s.p. 試行で男子52.3% (S.D. 26.49%)、女子51.2% (S.D. 26.13%) であり、いずれの試行においても男女間に有意な差はみとめられなかった。 2) 出現率の分布について a. complete p.s.p. 出現率は、男女とも0～100%まで幅広く分布し、出現率が高くなるにしたがって被検者数が減少する傾向を示した。 b. incomplete p.s.p. 出現率は、男女とも0～60%の範囲に分布していた。 c. total p.s.p. 出現率は、男女とも1～100%の範囲に分布し、最頻値は complete p.s.p. に比較して高くなった。 3) 右肘関節伸展動作時における全試行の動作開始時間の平均値は、男子199msec (S.D. 45.3msec)、女子200msec (S.D. 43.5msec) であり、左肘関節伸展動作時のそれは、男子203msec (S.D. 53･2msec)、女子208msec (S.D. 47.5msec) であり、男女間にはいずれも有意な差は認められなかった。 4) 右肘関節伸展動作時における全試行の動作時間の平均値は、男子107msec (S.D. 26.7msec)、女子125msec (S.D. 26.Omsec) であり、左肘関節伸展動作時のそれは、男子110msec (S.D. 25･3msec)、女子134msec (S.D. 32.5msec) であり、男女間にはいずれも1%水準で有意な差が認められた。これらの結果は、tonic discharge から phasic discharge へ移行する切り換え機構である動作前 silent period 出現率や刺激伝達時間である動作開始時間のような神経系の機能においては男女差のないことを示唆している｡},
 pages = {85--92},
 title = {動作前Silent Periodの出現率について : 第5報 男女差について},
 volume = {37},
 year = {1986}
}