Study On The Surface Emg Characteristics Of The Descending Movement Of Female Waltz Dancers

Waltz dance is the basic dance for dancers to learn standard dance.It plays a vital role in the study of five standard dances.Waltz descending movement training is an important special technical element,which is related to the stability of the dance process.It is also one of the important factors affecting sports performanceIn this paper,using literature methods,measurement methods,expert interview methods,and experimental methods,combined with related theoretical knowledge of sports medicine,sports biomechanics,and sports anatomy,to preliminary explore the angle state of the main lower limb joints of outstanding waltz movements Experimentally test the surface electromyography of waltz dance descending movements,explore the characteristics of muscle groups and myoelectric activity of waltz lower limb movements of different levels of players,and focus on analyzing female athletes' moments of muscle activation,muscle inactivation,sustained muscle discharge,and muscle integral electromyography.Provide basis for players and coaches to carry out targeted special training,put forward reasonable suggestions for improving the quality of players' movement completion,and then provide reference materials for enriching the theoretical system of waltz teaching and trainingIn view of the limited conditions,this article only studies the descent movement of the two feet in the waltz dance.The main findings are as follows1.The female waltz descending movement mainly involves the hip,knee and ankle.The muscles involved are the tibialis anterior muscle,biceps femoris,medial femoral muscle,lateral femoral muscle,medial head of gastrocnemius,Ten muscles of the lateral gastrocnemius,gluteus maximus,latissimus fasciae,and semitendinosus muscles2.The angle of hip joint of excellent female athlete is about 130°-145°,and the angle of knee joint is about 95°-100°.The angle of the ankle joint is about 26°-38°.Within this range,the player with the higher level has a smaller angle Regardless of the angle,the stability of the players should be maintained3.Regarding the moment of myoelectric activation of the descent movement of the waltz,in the first stage of energy storage,the hip,knee and ankle of ordinary female players started to activate first.The earliest activation was the lateral gastrocnemius muscle,and the activation time is 0.05 seconds.The female athletes to activate at this stage are also lateral to the gastrocnemius muscle.The activation time is 0.01 seconds,which is less than that of ordinary players.In the second stage of release,ordinary female players start to activate from the hip joint to the knee joint to the ankle joint,of which The earliest activation of the tibialis anterior muscle was 3.08 seconds.The outstanding female players mainly activated the hip and knee joints at this stage.The earliest activation was the lateral femoral muscle,and the activation time was 3.83 seconds.When maintaining strength in the third stage,ordinary female players kept too much on the hip biceps,and the activation time was 6.0 seconds.The activation sequence of the excellent female player is from the hip joint to the knee joint and finally stays on the ankle tibialis anterior muscle,and the activation time is 6.17s.The time sequence of the descending action of the outstanding female athletes is the lateral head of the gastrocnemius muscle?biceps femoris?latissimus fasciae?gluteus maximus?lateral femoris muscle?medial femoral muscle?semitendinosus muscle?rectus femoris muscle medial head?Tibia anterior muscle4.Regarding the moment of inactivation of myoelectricity in the descending action of the waltz,when the first stage was charged,the muscles in the hip joint,knee joint and ankle joint of the female player were the first to be inactivated.Among them,the ordinary female player was the first to live outside the gastrocnemius muscle The time of inactivation was 0.95 seconds.The earliest inactivation of outstanding female players is also the lateral gastrocnemius,and the moment of inactivation is 1.00 second.In the second stage of release,ordinary female players were mainly deactivated earlier by the hip and knee joints.The earliest inactivator was the tibialis anterior muscle,and the inactivation time was 3.20 seconds.At this time,the excellent female player had muscle inactivation in each joint.The earliest inactivated was the fascia lata muscle,the time of inactivation was 2.20 seconds,indicating that the excellent female player had both hip,knee,and ankle joints when doing descent.Muscles contract and are inactivated earlier.In the third stage of maintaining strength,the muscles of the knee and ankle joints of the average female player are inactivated at the latest,and they are finally maintained on the biceps femoris.The moment of inactivation is 6.92 seconds.At this time,the excellent female player is also the latest inactivator of the knee and ankle joints,but the excellent female player finally stays on the tibialis anterior muscle,and the moment of inactivation is 6.25 seconds.The sequence of the moment of muscle inactivation during the descending movement of the excellent female player is sequentially the lateral head of the gastrocnemius muscle?biceps femoris?gluteus maximus?latissimus dorsi muscle?lateral femoris muscle?medial femoral muscle?rectus femoris?medial gastrocnemius head?half Tendon muscle?tibialis anterior muscle5.In terms of the continuous discharge of the myoelectricity of the waltz dance,the longest moment of work is the muscle at the hip joint.The longest continuous discharge time for ordinary female players is the biceps femoris,which lasts for 0.920s;the shortest continuous discharge time is the rectus femoris,which lasts for 0.050s The longest continuous discharge time of excellent female players is also the biceps femoris,the continuous discharge time is 0.967s;the shortest continuous discharge time is also the rectus femoris,the continuous time is 0.030s.The length of the continuous discharge moment of the outstanding female athlete's descending muscles is biceps femoris?lateral gastrocnemius muscle?semitendinosus muscle?medial femoral muscle?fascia lata?medial gastrocnemius muscle?lateral femoral muscle?anterior tibialis muscle?hip Muscle?rectus femoris6.In terms of the integral electromyography and contribution rate of the descending movement of the waltz,the integral electromyography and contribution rate of ordinary female players are the rectus femoris muscle of the hip joint and the broad fascia tensor ankle muscle,of which the rectus femoris integrator muscle The electrical value is 0.872mv.s,with a contribution rate of 37.68%;the latissimus fasciae extensor myoelectric value is 0.324mv.s,with a contribution rate of 14%.The outstanding EMG and muscles with higher contribution rate are both rectus femoris and latissimus fasciae.Among them,the rectus femoris integral myoelectric value is 0.977mv.s,and the contribution rate is 39.20%.Myocardial EMG value is 0.345mv.s,and the contribution rate is 13.88%.From the point of view of the muscles with low integral electromyogram and contribution rate,ordinary female athletes have biceps femoris,which belongs to the hip joint.Their integral electromyography value is 0.053mv.s,and the contribution rate is 2.29%.It is the medial head of the gastrocnemius muscle and belongs to the knee joint.Its integral electromyogram is 0.54mv.s and the contribution rate is 2.15%.The most prominent contribution rate is the rectus femoris muscle,which has the strongest explosive power and action force,which should be paid special attention in teachingThe EMG value of each muscle of the outstanding female player in descending movements is rectus femoris?fascia lata?tibialis anterior muscle?medial femoral muscle?lateral gastrocnemius muscle?semitendinus muscle?lateral femoral muscle?gluteus maximus?femur Biceps?medial head of gastrocnemius.