The EMG Characteristic Analysis Of The Lower Limb Muscles In 24-style Taijiquan

Objective:Through using the method of electronic test this study attempts to conclude the lower limb muscle EMG features of high levels of 24-style Taijiquan practitioners, and analyzing the differences existed between the higher-level and the lower-level practitioners,and providing refrence for the low-level practitioners to improve the level of Tai Chi Chuan.Methods:Simultaneous ME-6000 apparatus and videotaping to the experiment of one set of 24-style Taijiquan for eight the higher-level and the lower-level practitioners,the study analyze the features of the lower limb muscle EMG in a whole 24-style Taijiquan and 24-type action and three steps (Part the Wild Horse's Mane on Right Side, Repulse Monkey, Wave Hands Like Clouds)by MegaWin software with simultaneous video. Data statistics processing uses independent samples t test and paired samples t test.Results:(1) The iEMG of vastus medialis and vastus lateralis tensor and fascia lata and tibialis anterior and rectus femoris is more in a whole 24-style Taijiquan of the low-level group; there is no significant difference between left and right side lower extremity muscles; there is fluctuating changes in muscle iEMG during 24-style Taijiquan and the peak and the trough appear at the same time. (2) The iEMG of right gastrocnemius, left gluteus maximus, left and right tensor fascia lata of the lower-level group is less than the higher-level group's during a whole 24-style Taijiquan;the iEMG of four or five musles is less than the lower-level group's in Wave Hands Like Clouds, Snake Creeps Down, Single Whip, Flash the Arm, Deflect Downward. (3) The three-step in the overall discharge of low-level group is relatively earlier than the high level group's, the discharge duration is relatively longer than the high-level group's. (4) The iEMG of the right gastrocnemius in Stride, the right gastrocnemius and right biceps femoris in Setback, the left calf and right femoral lateral muscle, left and right tensor fascia lata in Traverse-step of the lower-level group is less than the higher-level group's;the discharge time of the left vastus medialis in Stride, the right rectus femoris and vastus lateralis in Setback, the left vastus lateralis and left gluteus maximus in Traverse-step is shorter than the higher-level group's; the discharge time of the left and right tibialis anterior in Traverse-step is longer than the higher-level group's.Conclusions:(1) Vastus medialis and vastus lateralis tensor and fascia lata and tibialis anterior and rectus femoris the main force muscle in a whole 24-style Tai jiquan of the lower-level group; the left and right side lower limb exercise is balance. (2) Specification hip action is primary to improve the Taijiquan level of low-level group; low-level group is usually unstandard in the actions of Wave Hands Like Clouds, Snake Creeps Down, Single Whip, Flash the Arm, Parry and Punch. (3) The lower limb muscles discharge of low-level group in the three-step is less than the high-level group's, and little change. (4)Gastrocnemius, biceps femoris, vastus medialis, vastus lateralis, tensor fasciae latae of low-level group have not been stimulated enough in three steps.