The Impact of Electrical Muscle Stimulation Frequency on Lower Limb Strength and Muscular Endurance During Squats

The purpose of this study is to compare the differences in muscle strength and muscular endurance resulting from changes in squat exercise and EMS (Electronic Muscle Stimulation) frequency settings and to suggest efficient EMS frequency settings.The study subjects were 7 healthy men and 5 women in their 20s, a total of 12 people (height: 167.7 ± 7.24 cm, weight: 66.3 ± 11.72 kg), and a single EMS was applied at each frequency (0Hz, 30Hz, 85Hz).For each frequency (0Hz, After squatting with EMS (30Hz, 85Hz), an isokinetic dynamometer was used to measure peak torque, Peak TQ/BW, AVG Power, and Total Work at an angular velocity of 60°/sec and 180°/sec, which are variables of muscle strength and muscular endurance.Statistics The treatment compared and verified the differences between groups using one-way ANOVA in the IBM SPSS 28.0 program, and the statistical significance level was set at a=.05.First, there was a significant difference in all angular velocities of Left/Right Extension of the variables Peak Torque, Peak TQ/BW, AVG Power, and Total Work (p<.001), and the 85Hz EMS applied squat group showed the highest effectiveness.Second, there was a significant difference in all angular velocities of Left/Right Flexion of the Peak TQ/BW variable (p<.001), and the squat group applying 85Hz EMS showed the highest effectiveness.Therefore, it is believed that squats using EMS with a frequency of 85 Hz have a positive effect on muscle strength and muscular endurance.If EMS is applied to subjects of various ages in subsequent EMS studies and compared, it is believed that EMS and squats can be used in more effective and diverse ways.