Research On The Relationship Between Body Parameters And SEMG Indicators Of STS

The human body maybe lost movement ability because of various subjective and objective limits.It not only affects the patients’psychological and physical state but also brings complex social problems. Stand up action (sit-to-stand, STS) is the vital factors that affect People’s Daily life activity, but in life, the action restricted by various factors, such as acute pain, physical injury and the absolute muscle strength decline with age, and so on. As a result, this group need auxiliary stand product to assist them complete action stand. In the design of auxiliary stand products, the problem of how to give appropriate force auxiliary,according to different user’s body parameters and the active state of lower limb muscles,is crucial. This topic is to study the relationship of human body parameters with lower limb muscle electrical indicators of healthy subjects when they complete the STS activity.The purpose is to provide design reference data support for the design of the auxiliary stand product.First of all, through the experiment 1 obtain the lower limb muscle electrical indicators of healthy subjects when they complete the STS activity. And get the Contribution rate of lower limb muscles, obtain the STS main work muscles of the lower limbs through the experiment 2.Secondly,time-domain analysis of the lower limb muscle electrical signals,obtain the electrical indicators.Finally,study the relationships of the STS main work muscles electrical indicators with the human parameters which have a significant impact on the electrical indicators.Subject indicates that the main working lower limb muscles of the STS are vastus medialis muscle, vastus lateralis muscle, tibialis anterior muscle, rectus femoris muscle; Height and time domain indexes of RMS and IEMG have remarkable linear relationship, and to get the regression relation model of height and the electrical indicators of main working muscles; Through analysis of male and female subjects electromyographic signal, respectively, in the STS action when men and women, women on average RMS and IEMG 1 electrical were greater than men, showed that women overall discharge level greater than men of lower limb muscles. Therefore, women need to raise more motion unit to complete the STS, which implies women lower limb muscles are more easily to get tired.The above conclusions will provide theoretical basis and design reference for evaluating the STS lower limb muscle activity state,and the design of the intelligent active auxiliary stand product.Meanwhile,the conclusions can jugde the muscle activity state through the human parameters.It will play a substantial role to the group which has the lower limb muscle dysfunction.