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Fig. 3 | The Journal of Physiological Sciences

Fig. 3

From: Effects and biological limitations of +Gz acceleration on the autonomic functions-related circulation in rats

Fig. 3

The mean responses of heart rate (HR), central venous pressure (CVP), and arterial pressure at the level of the brain (brain AP) to +5.0 Gz acceleration in ten rats without anti-G equipment. HR was determined using a cardiotachometer coupled triggered by the R wave of the electrocardiogram. A CVP catheter was inserted from the right jugular vein and the catheter tip was put in the superior vena cava. The pressure transducer was fixed at the level of the rat heart. The loaded G is expressed as a logarithmic scale. Acceleration of +5.0 Gz without anti-G equipment decreased CVP from around a zero to −10 ± 1 mmHg, and increased HR from around 380–471 ± 20 bpm. CVP became a marked negative pressure, and arrhythmia occurred during the peak of +5.0 Gz and the G-decreasing phase [15, 16]

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