A Study Of Walking,balance And Cognitive Characteristics In Young People With Different Blood Alcohol Concentrations

Objective :One person in the world is injured every 3 seconds by a road traffic accident,and alcohol intake is an important trigger for pedestrian safety accidents.Due to the impact of alcohol on the frontal lobe of the brain,the body posture control and cognitive ability of pedestrians after drinking will show a downward trend and increase the risk of falls.The purpose of this study was to analyze the effects of different blood alcohol concentrations(no blood alcohol concentration,0.04 %,0.08 %)on walking,balance and cognitive ability by using self-controlled experimental design,in order to clarify the internal mechanism of the effect of alcohol on pedestrian body posture control and cognitive ability,to reduce the social harm and personal burden caused by alcohol use,and to provide theoretical basis for the formulation of legal behavior standards such as life,production and labor.Methods :In this study,a single-blind self-controlled experimental design was used to recruit 8healthy adult males.All subjects had no alcoholism and alcohol dependence habits,and had no history of acute lower limb sports injury in the past half year.The subjects were tested in three states : no drinking,0.04 % blood alcohol concentration and 0.08 % blood alcohol concentration.The kinematics data of the subjects during natural walking were collected by the qualisys motion capture system,and the data sampling frequency was set to 200 Hz.The AMTI force platform was used to collect the dynamic data of the subjects during natural walking and the balance index during single foot landing.The sampling frequency was set to1000 Hz,and the collected kinematics and dynamics indexes were analyzed and processed by Visual3 D software.The Podmed force platform was used to collect the pressure center trajectory of standing with eyes open and feet open.The psytoolkit3.4.3 test system was used to collect the reaction time and error number of go,nogo and 2-back research paradigms.One-way repeated measures analysis of variance was used to determine the differences between the three states.When there were significant differences in analysis of variance,LSD method was used for post-hoc post-hoc test.The data were expressed as mean ± standard deviation(Mean ± SD).All the data in this study were processed by statistical software SPSS21.0(IBMS,NY,USA).The statistical significance level was set to 0.05.Results :With the increase of blood alcohol concentration,there are the following three results :1.Peak swing diameter and left and right track length increase before and after static balance,and the difference is significant;the dynamic balance indexes APSI and MLSI increased and the difference was significant,but there was no difference between VSI and DPSI.2.No difference in all gait indicators;there was no difference in other kinematic and dynamic indexes of hip-knee joint except for the increase of impulse moment during the whole support period.The peak angle of ankle plantar flexion and the touch plantar flexion torque increase while the abduction peak torque decreases.3.2.2-Back reaction time and error number increased and the difference was significant;there was no difference in go and nogo reaction time and error number.Research conclusion :1.With the increase of alcohol concentration,the decrease of balance ability shows directional anisotropy : the instantaneous balance decreases in the front and rear directions of static balance,while the process balance decreases in the left and right directions;the balance of the dynamic balance before and after and left and right directions decreased,while the vertical direction had no effect on the overall balance.2.With the increase of blood alcohol concentration,walking ability showed selective changes : the overall gait had no effect;increased hip-knee joint load indicates an increased risk of strain;it is mainly used to adjust the body imbalance caused by the increase of alcohol concentration by increasing the ankle joint pedaling angle and increasing the plantar flexion moment of touch.3.With the increase of blood alcohol concentration,the cognitive ability showed a decrease in the refresh function of executive function and no effect on inhibition function.