The Case Compare Research Of Main Muscle Group’s Working Feature In Lunge With Different Unstable Surfaces

Objective:Discuss the activation differences between related muscles on lunge motion in different unstable surface by analysis the major muscle group’s working feature and its training effect. Meanwhile, explore the relationship between major muscle’s activation level and training intensity in different unstable surface by EMG test.Methods:The three different unstable surfaces, combine with16-channel telemetry electromyography (megawin6000-16), infrared high speed camera system and three-dimensional force platform, are used in this study. The target muscle’s maximum isometric strength has to be assessed before the experiment. Infrared camera is using for motion assessment. Plantar pressure and center of gravity’s change can be tested by force platform. When everything is ready, we are going to determine the electro-discharge reaction of lunge motion’s major working muscle in different unstable surface. In results analysis, we need to calculate integrated electromyogram (IEMG) of one movement, duration (S), and average integrated electromyogram (IEMG/S) in the movement process. When all the data is obtained, either similarities or differences of related muscles’working feature can be analysis.Results:1When lunge motion was done in two kinds of acting frequency of three different unstable surfaces, the front muscles of both thigh have shown the most active EMG performance in all the major working muscles. In front support leg, the most obvious electro-discharge was tested on internal and external side of quadriceps. In rear support leg, we can see severe electro-discharge on rectus femoris, internal and external side of quadriceps and tensor fascia lata together.2No matter what kind of acting frequency we used, in the ground state, the major working muscles’general electro-discharge of two legs are in the same level;In the rest two unstable states, the major working muscles’general electro-discharge level of rear support leg is higher than the front support leg, only gluteus maximus has shown a fairly strong electro-discharge in the front support leg.3No matter what kind of acting frequency we used, compared with ground state, the electro-discharge of thigh’s front muscles in front support leg has became weaker with two unstable surfaces; For rear support leg, the EMG performance of thigh’s front muscles has shown a more intense activation with two unstable surfaces. This feature is represented more obvious in full gas balance pad state than normal gas balance pad state.4When lunge motion was done in two types of acting frequency of each kind of unstable surface, the average IEMG value of related muscles’electro-discharge in three-second movement cycle is greater than six-second movement cycle. Compare the both legs as the rear support leg in lunge motion, the front muscles’EMG performance of weak leg’s thigh is more intense than the front muscles of strong leg’s thigh.Conclusions:1When lunge motion was done in two kinds of acting frequency of three different unstable surfaces, the front muscles of both thigh have shown the most obvious contribution in all the major working muscles. In front support leg, the most prominent strength was tested on internal and external side of quadriceps. In rear support leg, we can see significant contribution on rectus femoris, internal and external side of quadriceps and tensor fascia lata. In the ground state, the major working muscles’ general strength of two legs are in the same level.2When lunge motion was done in two kinds of acting frequency of full gas balance pad state and normal gas balance pad state, the rear support leg used more strength than front support leg. Compared with ground state, the strength of thigh’s front muscles in front support leg has became weaker with two unstable surfaces; For rear support leg, the strength of thigh’s front muscles is increasing with two unstable surfaces; Meanwhile, the strength of gluteus maximus in front support leg is increasing too with two unstable surfaces. All these features above is represented more significant in full gas balance pad state than normal gas balance pad state.3When lunge motion was done in two types of acting frequency of each kind of unstable surface, the average strength of related muscles’ contribution in three-second movement cycle is greater than six-second movement cycle. Compare the both legs as the rear support leg in lunge motion, the front muscles’ strength of weak leg’s thigh is greater than the front muscles of strong leg’s thigh.4In some extent, the quality and the stability of lunge motion can be used to judge the practical effect of related skills in actual combat.