Research On Design Of Inclined Standing Platform Based On SEMG

At present,many types of workers,such as supermarket cashiers,assembly and quality control workers,are required to stand up for work for a long time,and standing for a long time can lead to various health problems such as low back pain,lower limb discomfort,heart disease and varicose veins..Because of the flexibility and freedom of legs,standing posture can improve the efficiency of workers,so standing posture is a common working condition,and standing for a long time will lead to workers’ physical discomfort and muscle fatigue.Working in this condition for a long time may lead to occupational injury.Because standing for a long time has many negative effects,we should study some methods to solve or reduce the harm to the body.Many studies have shown that floor mats and insoles are effective ways to improve physical comfort and occupational health when standing for a long time.Nelson et al.found that standing on an inclined platform significantly reduced the discomfort of the waist and back of subjects,and attributed this phenomenon to the reduction of lumbar protrusion at the end of the lumbar spine and the increase of movement posture.However,up to now,few studies have considered standing platform as an intervention to reduce long standing muscle fatigue.Therefore,this paper takes the long-standing worker as the research object,studies the comfort effects of different tilt angle platforms on the long-standing worker,uses plantar pressure,surface muscle power and skin temperature to analyze and test the physiological changes of the long-standing worker in the experimental process,and uses subjective methods such as visual analogue scale to measure their psychological fatigue,from the material of the tilt platform,soft and hard.The optimum design scheme of inclined platform is discussed by changing the parameters of degree and inclination angle,which provides an effective scheme and theoretical basis for solving the comfort of longstanding crowd.Analysis conclusion:1)When standing on a 15° tilting platform,the leg’s self-adjusting ability is worse,and the body is more fatigued,which is not suitable for long standing.2)Standing on the inclined platform at different angles,the muscle fatigue of the human waist does not change much,that is,the standing at different inclination angles has no significant influence on the waist.3)Through the analysis of the EMG signal data of the leg and the subjective fatigue data,it can be known that when the standing time is 0-40 minutes,standing on the 0° platform is less fatigued than the other inclined angle platforms..When the subject is standing for about 40-60 minutes,the subjective fatigue of the body and the objective data of the muscle signals of the leg muscles will reach a maximum.After standing for 40 minutes,the leg muscles will slowly return to a state of recovery.According to the EMG signal data,the self-regulating effect of the leg muscles standing on the inclined platform at different angles is: 10°>5°>0 °>15°,that is,after 40 minutes,it is better to stand on a 10° inclined platform.