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題 名 | Role of the Autonomic Nervous System in Minimizing Acceleration-Induced Pressure Fluctuations in Intact Dog=自主神經系統在減少加速度誘導的狗血壓波動之角色(振溫性G力的研究) |
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作 者 | Randall,David C.; Knapp,Charles F.; Evans,Joyce M.; Wang,Mao; | 書刊名 | 中華民國航空醫學會刊 |
卷 期 | 12:1 1998.12[民87.12] |
頁 次 | 頁66-74 |
分類號 | 412.85 |
關鍵詞 | 自主神經系統; 血壓波動; 振溫性G力; Autonomic nervous system; Acceleration-induced pressure fluctuations; |
語 文 | 英文(English) |
英文摘要 | Low frequency accelerations during flight maneuvers can destabilize a pilot's arterial blood pressure. This experiment used a centrifuge to evaluate the autonomic control of arterial blood pressure during sinusoidal acceleration. Blood pressure, left ventricular stroke volume, heart rate and total peripheral resistance were recorded or calculated in intact dogs. The animals were sedated and positioned horizontally on a platform mounted on the arm of the centrifuge. Rotation of the centrifuge produced a radially outward acceleration of ± 2G. The platform on which the dog was positioned was turned at each of 12 different rates while the centrifuge was rotating to produce sinusoidal, ± 2G accelerations along the dog's z (spinal) axis. The platform rotation periods ranged from 125 sec. to 4.3 sec. The resulting changes in the dog's cardiovascular function were tested in 5 control dogs, in 5 dogs subject to complete cardiac denervation, and in 6 dogs whose hearts were paced at 120 bpm. The blood pressure fluctuations were smaller in the control animals than in the cardiac denervated subjects. Large increases and decreases in blood preseeure in the denervated dogs at frequencies between 0.02-0.07 Hz were caused primarily be lack of well-timed changes in heart rate and in total peripheral resistance and by failure to minimize inappropriate changes in stroke volume. Fixing the heart rate by pacing significantly diminished the otherwise normal dog's ability to minimize acceleration-induced blood pressure changes. We concluded that (1) the regulation of blood pressure in the lowest frequency range (0.005-0.012 Hz) in neurally intact dogs was primarily by appropriately timed adjustments in total peripheral resistance and stroke volume; (2) reflex regulation of heart rate as important for minimizing blood pressure fluctuations within the range from 0.032-0.077 Hz; and (3) blood pressure oscillation at frequencies >0.1 Hz was minimized primarily by the low-pass filter characteristics. |
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