Research article - (2023)22, 430 - 434
DOI: https://doi.org/10.52082/jssm.2023.431
Comparison of Muscle Activity and Muscle Thickness According to Knee Flexion Angle during Supine Bridge Exercises using the Abdominal Drawing-in Maneuver on an Unstable Surface
Sumin Kim1, Junhyung Park2, Jingang Her1,
1Department of Physical Therapy, Hallym Polytechnic University, Chuncheon-si, Republic of Korea
2Department of Physical Therapy, Dongguk University Medical Center 27, Goyang-si, Republic of Korea

Jingang Her
✉ Hallym Polytechnic University, 48, Janghakgil, Dong-Myeon, Chuncheon-si, Gangwon-do, Republic of Korea
Email: jghur7@empas.com
Received: 23-05-2023 -- Accepted: 13-07-2023
Published (online): 01-09-2023
ABSTRACT

This study evaluated changes in deep trunk muscle thickness and lower extremity muscle activities during bridge exercises with the abdominal drawing-in maneuver. Bridge exercises were conducted on an unstable surface at different knee flexion angles (60º, 90º and 120º), with the aim of identifying more effective angles for bridge exercises. This study included 21 healthy adults, aged 20–27 years. Biceps femoris (BF), rectus abdominis, and rectus femoris activity was measured using surface electromyography. The thicknesses of the transverse abdominis (TrA), external oblique (EO) and internal oblique (IO) muscles were measured. BF (p = 0.000, partial η2 = 0.670) activity increased considerably as the knee flexion angle decreased. TrA (p = 0.000, partial η2 = 0.883) and IO (p = 0.000, partial η2 = 0.892) thickness significantly increased, while EO (p = 0.000, partial η2 = 0.893) thickness decreased as the knee flexion angle decreased. When performing bridge exercises using the abdominal drawing-in maneuver on an unstable surface, the knee flexion angles should be at 120º and 60º to increase trunk stability and lower extremity muscle activity, respectively.
Key words: Electromyography, deep trunk muscle, lower extremity muscle, muscle activity, muscle thickness

Key Points
  • Different methods for bridge exercises should be performed depending on the purpose and goals of rehabilitation.
  • To increase trunk stability, a knee flexion angle of 120º should be used when performing supine bridge exercises using the abdominal drawing-in maneuver on an unstable surface.
  • To increase lower extremity muscle activity, a knee flexion angle of 60º should be used when performing supine bridge exercises using the abdominal drawing-in maneuver on an unstable surface.








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Comparison of Muscle Activity and Muscle Thickness According to Knee Flexion Angle during Supine Bridge Exercises using the Abdominal Drawing-in Maneuver on an Unstable Surface
Sumin Kim, Junhyung Park, Jingang Her
2023(22), 431 - 435.
DOI: https://doi.org/10.52082/jssm.2023.431