中文摘要：

使用《运动想象问卷-修订版》筛选出的30名被试（男女各半）,采用功能性近红外光谱成像技术（fNIRS）监测被试在执行实际举哑铃（男生,4磅和8磅;女生,2磅和4磅）任务和想象举同等重量哑铃任务时,其大脑皮层氧合血红蛋白浓度的变化。结果发现：男女被试在运动执行与运动想象任务下都激活了主运动皮层;且运动执行的大脑激活水平高于运动想象。在执行实际运动任务时,运动强度显著影响大脑皮层血氧浓度的变化,表现出左半球偏侧化优势;在执行想象运动任务时,运动强度没有影响大脑皮层血氧浓度的变化,且无偏侧化现象。

英文摘要：

It is widely believed that activity in the primary motor cortex relates only to motor execution. However, the extent to which similar activity occurs when imagining motor movements remains to be determined and, while some researchers report activity in the primary motor cortex during both motor execution and motor imagery tasks（e.g.Solodkin et al., 2004; Sharma et al., 2008）, others report no effects of motor imagery（e.g., Binkofski et al., 2000; Hanakawa et al., 2003; Hétu et al., 2013）. It is still unknown whether brain activation patterns of motor execution and motor imagery are similar, and whether both tasks activate the primary motor cortex. In addition, it is also unclear about the effect of imagination intensity on the primary motor cortex（this effect has been well established in motor execution tasks）. Accordingly, the present research investigated the relationship between the intensity of real and imagined exercise on cortical activity using functional near-infrared spectroscopy（f NIRS）, especially in the primary motor cortex. A preliminary assessment used 10 participants（5 male, 5 female）, who did not take part in the main experiment, to establish an appropriate level of exercise intensity. For the main experiment, 30 participants（15 male, 15 female） with high imagination ability were selected using the Motor Imagery Questionnaire（Revised）. These participants performed a motor execution task in which they actually lifted dumbbells under two levels of exercise intensity（males, 4 pounds and 8 pounds; females, 2 pounds and 4 pounds） and an imagery version of this task in which they imagined lifting dumbbells of these weights. The f NIRS was used to measure cortical changes in oxygen level during the performance of the two tasks. Finally, on completion of the imagery task, the ＂motor imagery self-assessment questionnaire＂ was administered to assess the quality of the participants＇ imagination. All participants reported that they could imagine dumbbell movement under d