Comparison of the Electromyographic activity, Quadriceps: Hamstring coactivation ratio and strength changes of dominant leg muscles in collegiate football and volleyball players during different forms of exercises

  • TANZILA T
  • et al.
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Abstract

The preliminary study was aimed to compare Electromyographic (EMG) activity, Quadriceps: Hamstring coactivation (Q: H) ratio and 1- Repetition maximum (RM ) squat changes of dominant leg muscles in collegiate football and volleyball players during different forms of exercises. Surface EM G analysis was carried out in 24 university level trained male players, football (n=12) and volleyball (n=12) while performing the following exercises: unilateral bridges, lunges, lateral step up to a 20.32 cm (8 inch) platform, quadruped arm/ lower extremity lift in the first session. The EM G activities of vastus medialis obliquus (VMO) and hamstrings muscles of dominant leg of the players of both groups were recorded using Power Lab EM G system (Lab Chart, AD instruments, ML -818, Australia). On the next session, 1-RM squat tests were also performed on the same players of both groups. In footballers, the lateral step-up, lunges and quadruped arm/ lower extremity lift and in volleyball players, only lunges produced EM G levels greater than 45% maximum voluntary isometric contraction (MVIC) in the VMO, which suggests that they may be beneficial for strengthening that muscle. All the exercises produced EM G levels less than 45% MVIC in hamstrings in both groups of players, so they may be more beneficial for training endurance and stabilization. The study also revealed smallest Q: H coactivation ratio in all exercises in volleyball players suggesting more hamstring activity than quadriceps but in footballers, moderate Q:H coactivation ratios were obtained establishing the quadriceps dominant activation in all these exercises. The 1- RM squat testing also showed significantly greater value (p=0.00) in football players than volleyball players. The findings in this study may be used to select specific exercises to enhance a core training programme depending on the individual needs of an athlete or as per the requirement of the specific sport. ABSTRACT FROM AUTHOR

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TANZILA, T., & CHATTERJEE, S. (2015). Comparison of the Electromyographic activity, Quadriceps: Hamstring coactivation ratio and strength changes of dominant leg muscles in collegiate football and volleyball players during different forms of exercises. Biology of Exercise, 11(2), 73–88. https://doi.org/10.4127/jbe.2015.0093

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