Before revision: One aspect that both research agree on is that there is no difference in activation of upper rectus abdominis and lower rectus abdominis as it is speculated that the muscle acts as one and cannot be differentiated.
After revision: ,One aspect that both research agree on is that there is no difference in activation of upper rectus abdominis and lower rectus abdominis as it is speculated that the muscle acts as one and cannot be differentiated.