| Lunge is not only a popular movement in lower limb training,but also a classic one sided lower limb training movement that requires the participation of all muscles and the coordination of multiple joints to complete a composite action.In the process of completing the lunge,not only does it require high flexibility and stability in the ankle,knee,and hip joints,but the nervous system is also better activated.The stride length between the front and rear legs,as well as the different heights of the front feet,are all biomechanical factors that affect the lunge squat movement.However,whether there are differences in the activation degree of lower limb muscle groups between different stride lengths and different heights of the front feet,and whether the best combination for developing lower limb muscle strength and improving lower limb stability still needs to be studied.Research purpose: This study aims to explore ways to maximize the activation of lower limb muscles,comprehensively evaluate the differences in lunge parameters with different forefoot heights and asynchronous combination methods from the perspective of electromyography,provide theoretical basis for preventing sports injuries,provide reference suggestions for fitness enthusiasts,those who need exercise rehabilitation,and various sports training,enhance training and fitness effects,and enrich the research of lunge movements.Research Method: This study recruited 14 students from the fitness and fitness elective class,and used NORAXON surface electromyography to test the electromyographic characteristics of lower limb muscle groups at a distance of 70% and 100% of leg length between the front and back legs,as well as at a height of flat ground and 15% of leg length between the front and back legs.The muscle activation status was analyzed to explore the changes in the surface electromyography of the main lower limb muscles under different heights and asynchronous distances in the lunge movement,In order to find the most suitable lunge squat for sports training and rehabilitation training.The results showed that when the front foot was flat and the stride distance was 70% and100% of the leg length,there was a significant difference(P<0.05)in the descending phase of the medial femoral muscle,lateral femoral muscle,and anterior tibial muscle,while there was a very significant difference(P<0.01)in the descending phase of the rectus femoris muscle.There was no significant difference(P>0.05)in the other muscles.The height of the forefoot is15% of the leg length.There is a significant difference between the lateral muscles of gastrocnemius muscle and gluteus maximus in the ascending stage(P<0.05),and there is no significant difference between the other muscles.When the stride is 70% and 100%,there is no significant difference in all muscles(P>0.05).When the stride is 70% leg length,the front foot height is flat and 15% leg length,there is a significant difference(P<0.05)in the ascending phase of the gluteus maximus muscle,while there is no significant difference(P>0.05)in the other muscles.When the stride is 100% leg length,the front foot height is flat and 15% leg length,and there is no significant difference in all muscles during the ascending and descending stages(P>0.05).Root mean square amplitude: When the front foot is flat and the stride distance is 70% and100% of the leg length,there is a significant difference(P<0.05)in the descending phase of the rectus femoris,lateral femoris,and medial femoris muscles.Among them,there is a very significant difference(P<0.01)in the descending phase of the rectus femoris and medial femoris muscles,while there is no significant difference(P>0.05)in the other muscles.When the front foot height is 15% of the leg length and the stride distance is 70% and 100% of the leg length,there is a significant difference(P<0.05)in the descending phase of the semitendinosus muscle,while there is no significant difference(P>0.05)in the other muscles.When the stride length is70% of the leg length,the front foot height is flat and 15% of the leg length,there is a significant difference in the descending phase of the medial thigh muscle(P<0.05),while there is no significant difference in the other muscles(P>0.05).When the stride is 100% leg length,the front foot height is flat,and the leg length is 15%,there is no significant difference in all muscles(P>0.05).Maximum amplitude: When the front foot is flat and the stride distance is 70% and 100%of the leg length,there is a significant difference in the descending phase between the rectus femoris(P<0.01)and the medial femoris(P<0.05),while there is no significant difference in the other muscles(P>0.05).When the forefoot height is 15% of the leg length,and the step distance is 70% and 100% of the leg length,there is a significant difference in the lateral head of the gastrocnemius muscle muscle in the ascending phase(P<0.05),and there is no significant difference in the other muscles(P>0.05).When the stride is 70% leg length,the front foot height is flat,and the leg length is 15%,there is no significant difference in the muscles during the ascending and descending stages(P>0.05).When the stride is 100% leg length,the front foot height is flat,and the leg length is 15%,there is no significant difference in the muscles during the ascending and descending stages(P>0.05).Compared to changes in forefoot height,changes in stride size have a greater impact on lower limb muscle activation.At steps of 70% and 100%,changes in front foot height do not have a significant impact on lower limb muscles.In the ascending stage of the lunge,at a 70%leg stride,the discharge of the semitendinosus and gluteus maximus muscles decreases as the height of the front foot increases.The discharge of the semitendinosus and gluteus maximus decreased by about 5% and 6% respectively,and the degree of muscle activation decreased by about 4% and 7%,respectively.The front foot is in flat ground mode,and as the stride length increases,the muscle activation of the rectus femoris and lateral muscles decreases.When the forefoot is 15% of the leg length and height,the activation degree of the semitendinosus,the lateral side of the gastrocnemius muscle muscle and the gluteus maximus muscle becomes greater.When the stride length is 70% of the leg length and the height of the forefoot increases,the activation degree of the semitendinosus and gluteus maximus muscles decreases.When the stride is 100% leg length,there is no significant change in muscle activation. |
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