Learning the muscular system involves memorizing details about each muscle, such as muscle attachments and Describing the rotation of the forearm back and forth requires special terms. Agonists, antagonists, and synergists of muscles. The Frontal plane divides the body from front to back. The Sagittal plane agonist/antagonist relationship changes depending on which muscle is expected to. Agonist muscles and antagonist muscles refer to muscles that Agonist muscles cause a movement to occur.
The antagonist muscle has several functions. It can relax lengthen in order to allow the agonist muscle to function to its fullest.Functional Roles of Muscles (Prime Mover, Synergist, Antagonist, Neutralizer, Stabilizer & Fixator)
It can also slow down the movement of the agonist muscle to prevent tearing or overuse. An example is the biceps and triceps muscle group.
When you do a biceps curl see image abovethe agonist muscle is the biceps, and the antagonist muscle is the triceps.
Now this is where it can get tricky. When you create the opposite movement—when you bring your hand AWAY from your shoulder see image below —the agonist muscle is the triceps and the antagonist muscle is the biceps. When you bring the hand away from the shoulder, the agonist is the triceps and the antagonist is the biceps.
This is because in order to create the movement of bringing the hand away, the triceps has to contract or shorten and the biceps has to lengthen or relax. Why is this important in yoga? Because if you understand the relationships between muscle groups, you can work smarter to get the most out of your practice! When you contract or shorten your quads agonistyou will help your hamstrings antagonist lengthen more effectively and more safely.
When you suck your stomach in, thus contracting your abs during a forward bend agonistyou will help to more efficiently stretch the muscles in your back antagonist. These two groups of muscles are important because they stabilize your spine. They need to have balance in order to keep your spine stable and healthy. The Purpose of a Back Extension Exercise Back Extension Muscles A back extension is slightly more complicated than a bicep curl because there are more muscles and more areas of the body involved.
During a back extension, you contract extensor muscles of the back like the multifidus and erector spinae. These muscles run up, along the spine, from the base to the skull.
Anatomical terms of muscle - Wikipedia
They act to extend the spine, bending it backwards. In a back extension these muscles are the agonist. Antagonist Muscles On the opposite side of the body from the multifidus and erector spinae are the abdominal muscles.
The most well-known ab muscle is the rectus abdominis, which is the muscle that you see when someone has a "six-pack. It acts to flex the spine, which is the opposite movement of the back extensor muscles. The rectus abdominis is not alone in its efforts to flex the spine. It also gets help from the external abdominal obliques and transversus abdominis. The external abdominal obliques are the ab muscles on the sides of your torso.
Anatomical terms of muscle
These muscles run from the bottom and sides of your ribs down into your pelvis. The transversus abdominis is the deepest ab muscle. It covers a large area, from the bottom of your sternum, down to the pelvis, and back to the sides of your hips. The rectus abdominis, external oblique, and transversus abdominis all flex the back, making them antagonists to the back extensor muscles.
Only those three abdominal muscles form the antagonist group for the back extension, leaving out the fourth abdominal muscle: This muscle is sandwiched between the external abdominal oblique and transversus abdominis and is used for rotation but not flexion of the spine.