Relationship between cortical oxygenation in the motor area and cardiovascular responses during preparation for exercise

本研究探讨了在准备和开始右手握力练习后，运动皮质(MCx)的激活与心血管反应的关系。用近红外光谱仪测定MCx中氧合Hb、脱氧Hb和总Hb水平，同时记录心率(HR)和平均动脉压(MAP)。我们研究了三个实验阶段，并得到了任何建议：(1)在运动准备阶段，心率和肌流率的增加与MCx激活的增加是相耦合的。(2)运动准备期间MCx中氧-Hb浓度差值与心率变化呈正相关。(3)握力训练开始后的MCx活性和感觉皮层反应不受MCx激活或运动准备过程中产生的与中枢指令有关的心率增加的影响。

The present study investigated the relationship between the activation in the motor cortex(MCx) and cardiovascular responses during preparation for and after starting right handgrip exercise. We measured levels of oxygenated hemoglobin(oxyHb), deoxygenated hemoglobin(deoxyHb) and total hemoglobin(totalHb) in the MCx by near-infrared spectroscopy and simultaneously recorded heart rate(HR) and mean arterial blood pressure. We studied three experiment sessions and obtained any suggestions ; (1) During preparation period for exercise, the increases in HR and muscle flow rate were coupled with the increase in the MCx activation. (2) The differential values of the oxyHb concentration in the MCx were positively correlated with HR changes during preparation period for exercise. (3) the MCx activities and sensory cortex responses after starting handgrip exercise are not affected by MCx activation or the increase in HR related to central command that develops during preparation for exercise.