Effects of a mental task on splanchnic blood flow in fasting and postprandial conditions
Effects of a mental task on splanchnic blood flow in fasting and postprandial conditions
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DOI：
10.1007/s00421-009-1316-y
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发表时间：
2010-04-01
影响因子：
3
通讯作者：
Hayashi, Naoyuki
中科院分区：
文献类型：
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作者：
Someya, Nami;Endo, Masako Yamaoka;Hayashi, Naoyuki
我们测试的假设，一个精神的任务衰减膳食引起的内脏血管舒张。10名受试者在空腹和餐后条件下进行了5分钟的色词冲突测试（CWT）。餐后条件下的受试者在进行CWT（心理任务试验）或休息（休息对照试验）之前摄入能量含量为300千卡（1，255 kJ）的固体食物。测量腹腔动脉（CA）和肠系膜上上级动脉（SMA）的平均血流速度（MBV）和平均动脉压（MAP）。用MAP除以CA和SMA的MBV来评估血管传导性（VC）。空腹状态下，CWT显著增加CA和SMA的MBV。在餐后条件下，在CA和SMA的MBV显着增加后立即在精神任务和休息对照试验。空腹状态下，CWT可显著降低SMA中的VC，但不影响CA中的VC。在餐后条件下，有两个动脉的VC之间的心理任务和休息控制试验没有显着差异。这些结果表明，一个心理任务施加不同的影响，在空腹条件下，但不是餐后条件下的CA和SMA。精神活动对SMA的血管收缩作用不能抵消进食的血管舒张作用。
We tested the hypothesis that a mental task attenuates the meal-induced vasodilation in the splanchnic vasculature. Ten subjects performed a 5-min colour-word conflict test (CWT) under fasting and postprandial conditions. Subjects in the postprandial condition had ingested solid food with an energy content of 300 kcal (1,255 kJ) before either performing the CWT (mental task trial) or resting (resting control trial). The mean blood velocities (MBV) in the coeliac artery (CA) and superior mesenteric artery (SMA), and the mean arterial pressure (MAP) were measured. The MBV in the CA and SMA were divided by the MAP to assess the vascular conductance (VC). The MBV in the CA and SMA were significantly increased by the CWT under fasting conditions. In the postprandial condition, the MBV in the CA and SMA significantly increased immediately after the meal in both the mental task and resting control trials. The VC in the SMA, but not in the CA, was significantly decreased by the CWT under fasting conditions. In the postprandial conditions, there was no significant difference in the VC in both arteries between mental task and resting control trials. These results suggest that a mental task exerts different effects on the CA and SMA under fasting but not postprandial condition. The vasoconstrictive effect of a mental task on the SMA does not counter the vasodilatory effect of meal ingestion.