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

Figure 3. Percentage of maximum voluntary isometric contraction (%MVIC) and standard deviation for the rectus abdominis (RA), rectus femoris (RF) and biceps femoris (BF) during supine bridge exercises at knee flexion angles of 60º, 90º and 120º. *p < 0.05.