A Study On The Mechanism Of Cortical Blood Oxygen Dynamical Variation Caused By Different Upper Limb Training Modes

Motor function is indispensable to human production and life.Patients with motor dysfunction due to the loss of part or all of their motor ability,causing serious distress in their daily activities.Rehabilitation exercise is an important means for patients with motor dysfunction to restore their limb movement ability.Rehabilitation is usually carried out based on the principle of repetitive appropriate training to induce brain function reorganization.However,continuous training can easily lead to physical fatigue and adversely affect rehabilitation treatment.This paper designs different task modes based on the grasping action,and recruits participants to carry out sports training research,using functional near-infrared spectrodccopy(fNIRS)to monitor the training process and its physiological state,and record related brain functions Regional cortical hemodynamic response,explore the relationship between different exercise training modes and the dynamic changes of blood oxygen in the functional areas of the brain,in order to provide a new theoretical basis for the rehabilitation of patients with motor dysfunction.In this study,through the design of software and hardware,the synchronous acquisition of cerebral blood oxygen signals,upper limb strength signals,and surface electromyography(sEMG)signals was realized.In order to explore the dynamic response of brain activation with changes in physiological state under different exercise modes,with the level of grasping strength as an indicator,different task modes with constant strength,gradual and adaptive adjustment of strength based on muscle physiological fatigue were designed.Recruit healthy volunteers to perform sports training tasks at different strength levels and task modes.Experiments show that under different modes,the subjects’ kinematic performances such as endurance,accuracy,and fatigue time are different.Correspondingly,the dynamic change of cortical blood oxygen level changes with the change of the mode.In the training process,the task force level is adaptively adjusted according to the fatigue of the subjects,which can improve the exercise performance of the subjects,and the blood oxygen activation level in the cortical areas of the brain is also more active.Rehabilitation treatment is often a long-term and continuous training process,and the treatment mode adopted is critical to the final treatment effect.In order to explore the effect of task mode on the dynamic changes of cerebral blood oxygen during long-term exercise training,this study recruited 36 healthy subjects,randomly divided into three groups,and performed different modes Constant force,progressive and adaptive adjustment based on fatigue)training task,start an 8-day continuous exercise training.Through signal processing,the brain activation feature values are extracted and cortical activation during exercise training is analyzed.At the same time,it uses the attributes of the small world to analyze the brain network,and explores the impact of long-term exercise training on the efficiency of brain network information transmission.The experimental results show that the increase in exercise training duration can promote the subjects’ endurance,exercise accuracy and maximum voluntary contraction.The blood oxygen activation level in the cortex of the brain changes dynamically with the training,showing "expansion-normalization" The process of change.The small-world attribute results show that exercise training can significantly improve the brain network connection,and the exercise training mode that is adaptively adjusted based on fatigue can better improve the efficiency of information transmission.This study combines fNIRS and exercise physiological signals to explore the blood oxygen response of the cerebral motor cortex during upper limb strength control training under different task modes.Through the analysis of brain activation characteristic values and changes in brain network connections,it explores sports training patterns and training.The dynamic change mechanism of cerebral blood flow during the process.Studies have shown that adaptively adjusted exercise patterns based on exercise fatigue can significantly improve exercise behavior and brain network transmission efficiency.