Influence of Exercise Load on Cortical Neural Activity Characteristics During Resistance Training:Evidence from fNIRS Study
This study aimed to measure the neural activity in the cerebral cortex during different resistance training loads,exploring the impact of high load training on neural activity characteristics.It included 18 males.A two factors within-subjects design was employed:exercise load(20%1RM,40%1RM,60%1RM,80%1RM)and regions of interest(primary motor cortex(M1),premotor cortex and supplementary motor area(PMC-SMA),dorsolateral prefrontal cortex(DLPFC).Near-infrared functional imaging device was utilized to measure the concentration of oxygenated hemoglobin(HbO)in the cerebral cortex during squatting.Subjective fatigue rating scales and heart rate watch were used to monitor internal exercise load.The results showed that higher loads resulted in lower HbOmean during the execution phase,while HbOmean increased from 20%1RM to 60%1RM range,but dropped at 80%1RM during the rest phase.M1 and PMC-SMA exhibited lower HbOmean than DLPFC during the execution phase,but showed higher HbOmean than DLPFC during the rest phase.There was an interaction between load and regions of interest.Exercise load had a more pronounced effect on HbOmean in the M1 and PMC-SMA compared to DLPFC during the execution phase.However,this regulatory effect tended to weaken during the rest phase.With higher load,there was a significant increase in the difference in subjective fatigue levels before and after training,as well as the average heart rate.It was conclude that the cerebral cortex undergoes an initial phase of negative activation induced by energy consumption during the early stages of resistance training,and the degree of negative activation was correlated with the magnitude of the load.Exercise load and cerebral cortex activation exhibited a non-linear correlation after movement execution,increasing synchronously within the low to moderate load but decreasing under high load.M1 and PMC-SMA played a more crucial regulatory role than DLPFC during resistance training.
万方数据
维普
