作者
Shigehiko Ogoh, Paul J Fadel, Peter Nissen, Øeivind Jans, Christian Selmer, Niels H Secher, Peter B Raven
发表日期
2003/7
期刊
The Journal of physiology
卷号
550
期号
1
页码范围
317-324
出版商
Blackwell Publishing Ltd
简介
We sought to quantify the contribution of cardiac output (Q) and total vascular conductance (TVC) to carotid baroreflex (CBR)‐mediated changes in mean arterial pressure (MAP) during mild to heavy exercise. CBR function was determined in eight subjects (25 ± 1 years) at rest and during three cycle exercise trials at heart rates (HRs) of 90, 120 and 150 beats min−1 performed in random order. Acute changes in carotid sinus transmural pressure were evoked using 5 s pulses of neck pressure (NP) and neck suction (NS) from +40 to −80 Torr (+5.33 to −10.67 kPa). Beat‐to‐beat changes in HR and MAP were recorded throughout. In addition, stroke volume (SV) was estimated using the Modelflow method, which incorporates a non‐linear, three‐element model of the aortic input impedance to compute an aortic flow waveform from the arterial pressure wave. The application of NP and NS did not cause any significant …
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