| Project/Area Number |
08680117
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
体育学
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| Research Institution | Graduate School of Human Culture, Nara Women's University |
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Principal Investigator |
SADAMOTO Tomoko Chair of Human Behavioral Science, Division of Integrated Sciences, Graduate School of Human Culture, Nara Women's University, 大学院・人間文化研究科, 助教授 (30201528)
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| Co-Investigator(Kenkyū-buntansha) |
SADAMOTO Tomoko Chair of Human Behavioral Science, Division of Integrated Sciences, Graduate Sch (30201528)
藤倉 素子 奈良女子大学, 文学部, 講師 (30220198)
平井 タカネ 奈良女子大学, 文学部, 教授 (30107346)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | blood pressure / heart rate / central command / overground locomotion / mechanical load change / 負荷変化 / 予測 / 教示内容 / Locomotion / Central descending signal / Decerebrate cat / カテコールアミン / 機械的情報 / 反射性制御 |
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| Research Abstract |
EXPERIMENT I. To examine whether the cerebrum is essential for producing the rapid cardiovascular adjustment at the beginning at overground locomotion, we examined heart rate (HR), mean arterial blood pressure (MAP), and integrated electromyogram (iEMG) of the forelimb triceps brachialis muscle during locomotion in freely-moving decerebrate cats. Two to four days after decerebration surgery performed at the level of precollicular-premammillary body, the animals would spontaneously produce overground locomotion supporting body weight. HR began to increase immediately before the onset of iEMG, and MAP began to rise almost simultaneously with the iEMG onset. Their increases in HR and MAP(24 * 3 bpm and 22 * 4 mmHg) were sustained during locomotion. Sinoaortic denervation (SAD) did not affect the abrupt changes in HR and MAP at the beginning of locomotion (0-4 s from the onset of iEMG), whereas SAD had a contrasting effect during the subsequent period, a decrease in the HR response (9 * 1b
… More
pm) and an increase in the MAP response (30 * 3 mmHg). These results suggest that the cerebrum an the rostral part of the diencephalon are not essential for producing the rapid cardiovascular adjustment at the beginning of spontaneous overground locomotion. The arterial baroreflex does not contribute this rapid adjustment but play an important role in regulating the cardiovascular responses during the later period of spontaneous locomotion.
EXPERIMENT II. To examine the role of a sudden load change on the cardiovascular adjustments during the bicycling exercise. Fifteen healthy female volunteers performed the same bicycling exercise which included one abrupt change of load-up or load-down under three different conditions in which the preliminary instructions about the load change given verbally before the bicycling exercise were no, true or false. The true and false instructions both produced anticipatory increases in HR and MAP observed 30 s before the onset of the load change, whereas no instruction did not alter them. After the onset of load-up or load-down, the cardiovascular responses to true instruction were more rapid than to other instructions. These results suggest that preliminary instructive preparation for voluntary exercise could modify the cardiovascular adjustment to the abrupt load changes. Less
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