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Effects of Maximum Repeated Squat Exercise on Number of Repetition, Trunk and Lower Extremity EMG Response according to Water Depth

  • Jang, Tae Su (Department of Pre-medical Course, Dankook University) ;
  • Lee, Dong Sub (Department of Leisure and Sports Coaching, Dankook University) ;
  • Kim, Ki Hong (Department of Recreation and Leisure Sports, Dankook University) ;
  • Kim, Byung Kwan (Sports Science Institute, Dankook University)
  • Received : 2020.12.24
  • Accepted : 2021.01.04
  • Published : 2021.02.28
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Abstract

The purpose of this study was to investigate the difference in the number of repetitions and the change in electromyographic response during the maximum speed squat exercise according to the depth conditions and the maximum speed squat exercise according to the time of each depth. Ten men in their 20s were selected as subjects and the maximum speed squat was performed for one minute in three environmental conditions (ground, knee depth, waist depth). We found that the number of repetitions according to the depth of water showed a significant difference, and as a result of the post-mortem comparison, the number of repetitions was higher in the ground condition and the knee depth than in the waist depth. And the muscle activity of rectus abdominis, erector spinae, rectus femoris, biceps femoris was increased during ground squat exercise, activity of all muscle was decreased during knee depth squat exercise, and activity of rectus abdominis, erector spinae, biceps femoris, tibialis anterior, gastrocnemius was decreased during waist depth squat. In conclusion, muscle activity of lower extremities during squat exercise in underwater environment can be lowered as the depth of water is deep due to buoyancy, but muscle activity of trunk muscles can be increased rather due to the effect of viscosity and drag.

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References

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