Correlation Analysis Between Angle Changes Of Knee Joint And Lower Limb SEMG In Tai Chi Typical Movement

Research Objectives： Through the study methods of electricity (biological feedbacksignal),Research the LAN tails action supporting leg flexor squat down different perspectives,different toe direction corresponding changes in muscle, observe LAN tails action methods ofelectric changes of lower limb, and the relationship between the joint Angle and electromyography,explore suitable LAN tails practice the most suitable Angle, to help beginners to correct improperway of practice, looking for suitable for tai chi chuan LAN tails action is the most suitable flexorsquat Angle and toe direction, science, health for beginners to practice tai chi chuan has a certainreference.Research Methods：Based on16female students from Shanghai university of Sports, Keeppracticing tai chi for more than16weeks, and did not receive professional Taijiquan team training.We try to take24tai chi LAN finches tail action as an example through setting Three differentknee flexion Angles to analyze the correlation between the lower limb muscle force and thechange of the knee joint rotation angle.Research Results：Different squatting height arrow quiver, stroke, squeeze, the four phases kneesquatting120°knee flexion squatting150°comparison of the vastus lateralis, biceps femorisEMGrms(%MVC) there is a significant difference in the crowded stage, squatting135°to150°and squatting comparison of lower extremity vastus lateralis and biceps femoris significantdifference in the arrow quiver stage, squatting120°and squatting for a comparison of150°, themedial femoral muscle EMGrms (%MVC) with a significant difference.Height of squatting in arrow quiver, stroking, squeezing, the four phases knee squatting120°squat with knee flexion of150°comparison of the vastus lateralis, biceps femoris EMGrms (%MVC) the existence of significant differences in the crowded stage, squatting135°to150°andsquatting comparison, with a significant difference between the lower limb vastus lateralis andbiceps femoris, the the arrow quiver stage, Qu squatting120°compare squatting150°, also on thelower extremity of the vastus medialis EMGrms (%MVC) with a significant difference.Research Conclusions: LAN tail action stroke, squeeze, stage by stage, in the direction of thesame toe angle control with the knee squatting reduce its lower limb biceps femoris, vastusmedialis, vastus lateralis muscle discharge volume increased Meanwhile, the amount of thesemitendinosus discharge amount and vastus lateralis discharge, the biceps femoris discharge andthe the vastus medialis discharge amount appears symmetrical phenomenon of change; arrow quiver, stroke, squeeze, press four stages, squatting heighttiptoe direction of the femoral bicepsdischarge volume in stroke, squeeze, stage by stage, toe direction for the vastus medialis muscledischarge had a significant effect;45°toe direction for medial femoral muscle and shares twostimulation of the muscle EMGrms (%MVC) than by the other two toes.Toe direction of60°, under three different height squatting, squatting135°arrow quiver,stroking, squeezing, four stages are the smallest, arrow quiver, stroking, squeezing, four stages inthe same squatting height toe direction90°, the knee spin angular toe direction90°for theinfluence of the angle of rotation within significantly larger than the toe direction and toe direction45°60°impact;90°for rotation of the inner angle of the toe direction the impact wassignificantly greater than the toe direction45°impact and toe directions of60°.In arrow quiver stage, lower limb surface EMG and knee spin memory low degree ofnegative correlation in stroke, squeeze, stage by stage, lower extremity of surfaceelectromyography knee spin angular unrelated.