Influence Of Different Load-bearing Methods On Walking Characteristics Of Lower Limbs

Weight-bearing walking may be an effective training method,which combines the advantages of high efficiency and various methods of weight training,as well as the characteristics of low technical difficulty and high health benefits of walking.Research Objectives: The aim of this experimental research is to explore different weight comprehensive way on foot,kinematics parameters,energy metabolism,multi-channel semg indicators related to the parameters,the relationship between the military professional training for athletes and provides the basis theory of biomechanics,provide a reference for the army,the training of the athletes,coaches,and finally guide the scientific and reasonable training methods to reduce the damage from movement and joint stress,in the development of sports ability and reduce the incidence of injury.Research Methods: Twelve male players of the high-level sports team of Nanjing University of Physical Education were recruited and walked for 30 minutes under the condition of vest loading,calf loading and foot loading respectively,and the relevant indicators during the process were collected and analyzed.Results: The results of surface electromyography showed that time and processing factors had significant effects on i EMG of quadriceps femoris,biceps femoris and gastrocnemius.Iegm of quadriceps femoris was significantly lower after foot loading than before;iegm of biceps femoris was significantly higher after vest loading and foot loading than before;i EMG of gastrocnemius was significantly higher after vest loading and leg loading than before.The results showed that the AEGM of quadriceps femoris was significantly lower after weight-bearing than before;the AEGM of biceps femoris was significantly higher after weight-bearing than before;the AEGM of tibialis anterior was significantly lower after weight-bearing than before;the AEMG of gastrocnemius was significantly lower after weight-bearing than before.At the same time,the values of MF and MPF of quadriceps femoris under foot load were significantly lower than those under vest load and leg load;the values of MF and MPF of Gastrocnemius after vest load were significantly lower than those before load.The results of kinematics showed that trunk flexion,trunk lateral bending,left knee flexion,vertical displacement of center of gravity and vertical displacement of center of gravity changed significantly under different loads.Before and after foot loading,there were significant differences in trunk flexion and extension angle,left foot pronation and supination angle,vertical displacement of center of gravity and percentage of vertical displacement of center of gravity.Vertical displacement of center of gravity,percentage of vertical displacement of center of gravity and trunk flexion increased with time,right foot pronation angle decreased,and right foot pronation showed a trend.Compared with normal gait and the other two ways of weight-bearing,foot weight-bearing significantly changed the spatiotemporal parameters of gait.The results of metabolic correlation showed that respiratory rate,relative oxygen uptake and energy consumption were significantly higher in the three load-bearing modes than in the quiet state,and the foot negative weight-bearing mode was the highest.The maximum heart rate and average heart rate of foot negative reorganization were higher than those of vest negative reorganization and calf negative reorganization.Conclusion: 1.The influence of vest weight-bearing walking on biceps femoris,tibialis anterior muscle and gastrocnemius muscle is the most obvious,and quadriceps femoris has higher adaptability to vest weight-bearing walking.In addition,compared with the other two ways of weight-bearing,vest weight-bearing has less influence on walking kinematics,heart rate and energy consumption.In addition to sweating,the subjects did not feel obvious joint and muscle discomfort.2,The fatigue degree of gastrocnemius is higher than that of the rest of lower limb muscles,and the degree of leg pain is also higher than that of the other two ways.This may be due to the influence of sandbag bandage on muscle contraction and local muscle blood flow.Its heart rate performance is similar to vest weight-bearing,and its energy consumption is between vest weight-bearing and foot weight-bearing.In addition,the adaptive changes of spatial parameters such as trunk flexion angle suggest that the lower leg weight-bearing may bring injury risk.3,Compared with no weight-bearing,vest weight-bearing and leg weight-bearing,foot weight-bearing walking has a greater impact on human joints.In addition,the spatial parameters of the lower limbs changed asymmetrically with the control of other variables except the way of loading.This suggests that the walking style of foot loading may bring higher potential risk to the non dominant side of lower limbs.However,the gait structure of human body changes obviously when the foot is loaded.The specific performance is that the step length of foot weight-bearing walking is significantly increased compared with that of vest weight-bearing walking.This may be due to the increase of lower limb stiffness caused by foot load,which increases the impact force between the foot and the ground,and then leads to the increase of limb pressure in the buffering process of lower limb muscles and joints,resulting in the acceleration of fatigue process.In the three ways of weight-bearing,the intensity of exercise is the largest and the energy consumption is the largest.Combined with the results of heart rate,subjective evaluation scale and electromyography and kinematics parameters,compared with the other two weight-bearing methods,foot weight-bearing seems to bring greater burden to the respiratory system and skeletal muscle system,but it is not clear whether it will bring potential health risks.4,in conclusion,the experimental results can provide reference for the selection of reasonable weight,weight bearing walking foot because of its high energy consumption,suitable sports load need more people to improve the training effect;Vest load can improve energy consumption without causing obvious discomfort to joints and muscles,and it is more suitable for public fitness people who do not need excessive amount of exercise.