Nevertheless, the pectoralis major functions as the primary shoulder
horizontal flexor muscle and is twice as efficient than any other muscle in this role.
Not exact matches
As gravity wants to pull the head down, the upper cervical (neck)
flexor muscles and lower cervical extensor
muscles must contract to maintain this head and neck position when the body is
horizontal.
Sprint running ability seems to be mainly determined by the ability of the hamstrings to absorb energy at long
muscle lengths, and of the hip extensors (gluteus maximus, adductor magnus, and hamstrings) and hip
flexors to perform concentric work at high velocities while operating at short
muscle lengths, all in a
horizontal direction.