Logan Steele
Horizontal adduction is a transverse plane joint action that results in movement toward the midline of the body. This can occur at the shoulder joint, where the humerus moves toward the midline, or at the hip joint, where the femur moves toward the midline. The ability to perform horizontal adduction is assessed through manual muscle testing, which can help identify any deficiencies or imbalances in muscle strength and endurance. Understanding the mechanics of horizontal adduction is crucial for fitness professionals and athletes aiming to improve performance and prevent injuries.
| Characteristics | Values |
|---|---|
| Definition | Horizontal adduction is a transverse plane joint action that results in movement toward the midline of the body. |
| Other Names | Horizontal flexion, osteokinematic motions, osteokinematic joint actions |
| Examples | Bringing your hands together in front of your chest, as you do during a chest flye; the femur moving toward the midline of the body in the transverse/horizontal plane during a seated adductor (inner thigh) machine exercise; the humerus moving toward the midline of the body in the transverse plane during chest exercises like push-ups, bench press, and dumbbell press. |
| Muscles Involved | Pectoralis major, anterior deltoid |
| Muscle Testing | For grades 4 to 5, apply resistance to the forearm just proximal to the wrist in the opposite direction of horizontal adduction. |
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What You'll Learn
Horizontal adduction is a transverse plane joint action
In the shoulder joint, also known as the glenohumeral joint, horizontal adduction occurs when the humerus moves toward the midline of the body in the transverse plane. This can be observed during chest exercises like push-ups, bench presses, and dumbbell presses. The anterior deltoid and pectoralis major muscles are involved in shoulder horizontal adduction.
In the hip joint, horizontal adduction occurs when the femur moves toward the midline of the body in the transverse or horizontal plane. This can be observed during exercises such as the seated adductor machine, which targets the inner thigh.
It is important to note that horizontal adduction is different from simply "adduction." Adduction refers to the movement of a bone towards the midline, but this occurs in the frontal plane rather than the transverse plane. For example, during a lat pull-down exercise, the arms move towards the sides of the body, which is an adduction movement.
To assess the strength of the muscles involved in horizontal adduction, manual muscle testing can be performed. For grades 4 to 5, resistance is applied to the forearm, opposite to the direction of horizontal adduction. To meet the criteria for normal muscle performance, a patient must be able to move through a complete range of motion or maintain an endpoint range against maximum resistance.
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It results in movement towards the midline of the body
Horizontal adduction is a transverse plane joint action that results in movement towards the midline of the body. This movement can occur at the shoulder or hip joint. During shoulder horizontal adduction, the humerus moves towards the midline of the body, as observed during chest exercises like push-ups, bench presses, and dumbbell presses. The anterior deltoid and pectoralis major muscles are involved in shoulder horizontal adduction.
To assess the strength of the muscles involved in shoulder horizontal adduction, manual muscle testing can be performed. For grades 4 to 5, resistance is applied to the forearm, just proximal to the wrist in the opposite direction of horizontal adduction. To satisfy grade 5 'normal muscle' performance, the individual being tested must be able to move through a complete range of motion against this resistance.
In the case of the hip joint, horizontal adduction occurs when the femur moves towards the body's midline in the transverse or horizontal plane. This movement can be observed during exercises using a seated adductor (inner thigh) machine.
It is important to note that horizontal adduction is different from simply "adduction". Adduction refers to the movement of a bone towards the midline, but in the frontal plane. An example of adduction would be the movement of the arms returning to one's sides during a lat pull-down exercise.
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It occurs at the shoulder and hip joints
The shoulder and hip joints are complex structures that allow for a wide range of movements, including horizontal adduction.
Shoulder Joint
The shoulder joint, or glenohumeral joint, is a ball-and-socket joint that connects the head of the humerus (upper arm bone) to the scapula's (shoulder blade) glenoid cavity. This joint has the highest degree of mobility among all human joints, allowing for a wide range of motion in multiple planes.
During horizontal adduction, the humerus moves toward the midline of the body in the transverse plane, as seen in exercises like push-ups, bench presses, and dumbbell presses. This movement is driven by muscles such as the pectoralis major, latissimus dorsi, and teres major. The deltoid muscle, specifically its middle fibers, also plays a role in shoulder abduction and can assist in horizontal adduction.
The shoulder's complex musculature includes global movers and fine-tuning stabilizers. The larger muscles, such as the trapezius, levator scapula, pectoralis, deltoids, serratus anterior, and latissimus dorsi, enable gross motor movements. The fine-tuning stabilizers, including the supraspinatus, subscapularis, infraspinatus, and teres minor (collectively known as the rotator cuff complex), are crucial for coordinated and smooth shoulder movements.
Hip Joint
The hip joint is a large joint that connects the femur (thigh bone) to the pelvis. During horizontal adduction, the femur moves toward the body's midline in the transverse or horizontal plane, as observed during exercises like the seated adductor (inner thigh) machine.
The hip joint also relies on a combination of muscles and soft tissues for stability and movement, although the specific muscles involved in hip horizontal adduction were not readily apparent in the search results.
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Muscles involved include the pectoralis major and anterior deltoid
Horizontal adduction is a transverse plane joint action that results in movement toward the midline of the body. This can occur at the shoulder or hip joint. During shoulder horizontal adduction, the humerus moves toward the midline of the body in the transverse plane, as observed during chest exercises like push-ups, bench presses, and dumbbell presses. The muscles involved in this movement include the pectoralis major and anterior deltoid.
The pectoralis major is a large, fan-shaped muscle that originates from the clavicle (collarbone) and attaches to the humerus (upper arm bone). It is the main muscle responsible for horizontal adduction of the shoulder. This muscle is crucial for many upper body movements and is often targeted in exercises such as chest flyes, where the arms are brought together in front of the chest.
The anterior deltoid, also known as the front shoulder muscle, is responsible for various shoulder movements, including horizontal adduction. It originates from the clavicle and attaches to the humerus, allowing for forward and upward movements of the arm.
Together, the pectoralis major and anterior deltoid muscles work synergistically to bring the arm across the body during horizontal adduction. This movement is essential for various functional and athletic activities, such as reaching across the body or performing certain swimming strokes.
It is important to note that while these muscles are primarily involved in horizontal adduction at the shoulder, horizontal adduction can also occur at the hip joint. During hip horizontal adduction, the femur moves toward the midline of the body in the transverse plane, as seen during exercises like seated adductor machine workouts that target the inner thigh muscles.
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Horizontal adduction is distinct from adduction, which occurs in the frontal plane
Horizontal adduction is a transverse plane joint action that results in movement toward the midline of the body. It is also known as horizontal flexion. To horizontally adduct the shoulder, the anterior deltoid and pectoralis major muscles are used.
Horizontal adduction occurs when the humerus moves toward the midline of the body in the transverse plane, as observed during chest exercises like push-ups, bench presses, and dumbbell presses. This is distinct from adduction, which occurs in the frontal plane. Adduction refers to a bone moving closer to the midline in the frontal plane, such as when the arms return to your sides during a lat pull-down.
The difference between horizontal adduction and adduction can be observed in the plane of motion. Horizontal adduction occurs in the transverse plane, while adduction occurs in the frontal plane. The transverse plane is an imaginary line that divides the body into top and bottom halves, while the frontal plane divides the body into front and back halves.
Another way to differentiate between the two movements is by observing the direction of the humerus bone. In horizontal adduction, the humerus moves toward the midline of the body in the transverse plane. In adduction, the bone moves closer to the midline in the frontal plane.
Understanding the difference between horizontal adduction and adduction is important for properly isolating and targeting specific muscle groups during exercise. For example, during a chest fly, the hands come together in front of the chest, requiring horizontal adduction of the pectoralis major. In contrast, during a lat pull-down, the arms move toward the midline of the body from the sides, involving adduction.
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Frequently asked questions
Horizontal adduction is a transverse plane joint action that results in movement toward the midline of the body.
The pectoralis major, anterior deltoid, and femur muscles are involved in horizontal adduction.
Bringing your hands together in front of your chest, as in a chest fly, and doing a chest exercise like push-ups, bench press, or dumbbell presses are examples of horizontal adduction.
Adduction is the movement of a bone towards the midline in the frontal plane, such as when your arms return to your sides during a lat pull-down. Horizontal adduction occurs in the transverse/horizontal plane.
You can test your horizontal adduction strength by applying resistance to your forearm, just proximal to the wrist, in the direction opposite to horizontal adduction.
