Differential arterial blood flow response of splanchnic and renal organs during low-intensity cycling exercise in women
Differential arterial blood flow response of splanchnic and renal organs during low-intensity cycling exercise in women
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DOI：
10.1152/ajpheart.91491.2007
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发表时间：
2008-05-01
影响因子：
4.8
通讯作者：
Fukuba, Yoshiyuki
中科院分区：
文献类型：
--
作者：
Endo, Masako Yamaoka;Suzuki, Rie;Fukuba, Yoshiyuki
为了研究运动开始时腹部动脉的局部血流动力学反应，并关注其瞬态反应，8名女性受试者（21-30岁）在半仰卧位下进行了40瓦4分钟的测力仪自行车运动。采用脉冲超声多普勒测量右肾动脉（RA）、肠系膜上动脉（SMA）和脾动脉（SA）的平均血流速度（MBVs），并测量心率（HR）和平均动脉压（MAP）。通过MBV/MAP计算各动脉血管阻力指数（RI）。运动时MAP （4min时76 +/- 9 ~ 83 +/- 8 mmHg）和HR （4min时60 +/- 7 ~ 101 +/- 9次/min）升高（P < 0.05）。RA和SA的MBV在运动开始后（30 s，分别为-19 +/- 5%和-19 +/- 12%）迅速下降，运动结束时分别达到-27 +/- 7%和-27 +/- 15% （P < 0.05）。RI在运动的最初30秒内没有变化，反映了MAP的减少，并在运动结束时增加（分别为+ 55 +/- 21%和+ 59 +/- 39%）。相反，在整个运动过程中，SMA的MBV和RI都保持不变。结果表明，在整个运动过程中，肾血管和脾血管的反应发生了相似的变化，而主要向肠道供血的SMA血管的反应在运动过程中没有变化。因此，我们得出结论，低强度的自行车运动导致供应腹部器官的动脉的血流反应不同。
To investigate the regional hemodynamic responses of abdominal arteries at the onset of exercise and to focus on their transient responses, eight female subjects (21-30 yr) performed ergometer cycling exercise at 40 W for 4 min in a semi-supine position. Mean blood velocities (MBVs) in the right renal (RA), superior mesenteric (SMA), and splenic (SA) arteries were measured by pulsed echo-Doppler ultrasonography, with beat-by-beat measurements of heart rate (HR) and mean arterial pressure (MAP). The vascular resistance index (RI) of each artery was calculated from MBV/MAP. MAP (76 +/- 9 to 83 +/- 8 mmHg at 4 min) and HR (60 +/- 7 to 101 +/- 9 beats/min at 4 min) increased during exercise (P < 0.05). The MBV of RA and SA rapidly decreased after the onset of exercise (30 s; -19 +/- 5% and -19 +/- 12%, respectively), reaching -27 +/- 7% and -27 +/- 15% at the end of exercise (P < 0.05). RI did not change during the initial 30 s of exercise, reflecting a reduction in MAP, and increased toward the end of the exercise (+ 55 +/- 21% and + 59 +/- 39%, respectively). In contrast, both the MBV and RI in the SMA remained constant throughout the exercise. The results indicate that, whereas the responses of renal and splenic vessels changed similarly throughout the protocol, the vascular response of SMA that mainly supplies blood to the intestinal tract was unchanged during exercise. We, therefore, conclude that low-intensity cycling exercise resulted in differential blood flow responses in arteries supplying the abdominal organs.