Surface Electromyographic Variations in Major Lower Limb Muscle Groups during a 400-Meter Race
OBJECTIVE:To evaluate surface electromyographic changes in major lower limb muscle groups during a 400-meter race.METHODS:21 healthy male subjects had electrodes attached to muscle bellies in the left and right lower limbs,capturing electromyographic signals during a 400-meter race on a circular track.RESULTS:Compared to the early phase of the 400-meter race,the mid-phase exhibited a significant reduction in the average amplitude of the right tibialis anterior muscle(P≤0.001),along with significant decreases in the average amplitude of the lateral gastrocnemius,left tibialis anterior,and right vastus lateralis muscles(P＜0.05).In the late phase,there were notable decreases in the average amplitude of the lateral gastrocnemius,right rectus femoris,right vastus lateralis,and right gastrocnemius muscles(P＜0.05).When comparing mid-phase to late-phase,there was a significant increase in the average amplitude of the left tibialis anterior muscle and a significant decrease in the average amplitude of the right rectus femoris muscle(P＜0.05).Regarding integrated electromyographic values,the mid-phase showed a significant decrease in the integrated electromyographic value of the lateral gastrocnemius(P＜0.05),and the late phase exhibited significant decreases in the integrated electromyographic value of the right rectus femoris(P＜0.05).When comparing mid-phase to late-phase,there was a significant increase in the integrated electromyographic value of the left tibialis anterior muscle and significant decreases in the integrated electromyographic values of the right rectus femoris and right vastus lateralis muscles(P＜0.05).In comparison to the early phase,the late phase displayed an extremely significant decrease in the peak electromyographic value of the left tibialis anterior muscle(P =0.001),along with significant decreases in the peak electromyographic values of the right rectus femoris and significant increases in the peak electromyographic value of the right tibialis anterior muscle(P＜0.05).When comparing mid-phase to late-phase,there was an extremely significant decrease in the peak electromyographic value of the left tibialis anterior muscle(P＜0.001)and a significant increase in the peak electromyographic value of the right tibialis anterior muscle(P＜0.05).The median frequency of the left rectus femoris,left tibialis anterior,right rectus femoris,right lateral gastrocnemius,and right tibialis anterior muscles exhibited an extremely significant decrease(P≤0.001),while the median frequency of the left rectus femoris,left adductor magnus,and right vastus lateralis muscles showed a significant decrease(P＜0.05).CONCLUSION:Overall,the study indicates distinctive changes in surface electromyography among six selected muscle groups during a 400-meter race.The altered muscle groups may potentially impact 400-meter race performance,suggesting targeted training for muscles with significant electromyographic decreases,such as the rectus femoris and tibialis anterior muscles.
万方数据
维普
