Abstract：Objective To explore the changes of activation state of cortex in various functional areas of brain after exercise fatigue,
and understand the mechanism of central exercise fatigue as soon as possible. Methods A total of 32 healthy subjects were collected
and divided into right-handed group and left-handed group. The exercise schemes of power bicycle riding and two hands/one hand
fist clenching were designed for experimental research, functional magnetic resonance imaging (fMRI) was performed at the same
time. Results The results showed that when both hands were moving at the same time, the ω1 of the left M1 area corresponding
to the right hand was higher than that of the right M1 area corresponding to the left hand. When the right hand reached exercise
fatigue, the ω1 of left M1 area activated by the right hand was significantly higher than the ω1 of right M1 area activated by the left
hand. When both hands were moving, the ω1 value of the left hemisphere was lower than that of the M1 region of the right hand
movement, and the result of ω2 was the same as above. The experimental results of left hands were symmetrical. The Cho/Cr ratio
in the left basal ganglia was 1.16±0.53 at rest, after exercise fatigue, it was 0.71±0.52, the difference was statistically significant
(P<0.05). The NAA/Cr ratio in the left basal ganglia was 1.95±0.17 at rest and 2.81±1.88 after exhaustive exercise,
showing a significant increase (P<0.05). Conclusion The handedness has a longer cluster time response and a larger standard
deviation than the non-handedness. The decrease of Cho/Cr ratio in left basal ganglia after exercise fatigue was caused by exercise
fatigue limitation, and the increase of NAA/Cr ratio in left basal ganglia after exercise exhaustion was a limiting factor of exercise
exhaustion. In short, using fMRI to evaluate the activation of cerebral cortex after exercise fatigue is of great value to the research of
neuroscience and sports medicine.
孙海峰，王锐. 功能磁共振成像仪评估运动疲劳后大脑皮质的激活状态[J]. 中国医疗设备, 2022, 37(5): 95-99.
SUN Haifeng, WANG Rui. Evaluation of Activation State of Cerebral Cortex After Exercise Fatigue by
Functional Magnetic Resonance Imaging. China Medical Devices, 2022, 37(5): 95-99.
