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Muscle shortening occurs when muscles contract or tense, causing them to pull short and grip. This can happen involuntarily, such as when attempting to lift a weight that is too heavy, or voluntarily, such as when flexing the bicep muscle. Adaptive shortening refers to the process where muscles and connective tissues shorten over time due to being held in shortened positions, often from prolonged sitting. This can cause discomfort and reduced mobility, and may require targeted exercises to regain and maintain muscle length and flexibility. While muscle contraction and shortening are related, they are not synonymous, as tension can be produced in a muscle without a change in length.
| Characteristics | Values |
|---|---|
| Definition | Adaptive shortening refers to the physiological process where muscles and connective tissues shorten their length or become “tight” over time as a result of being chronically held in shortened positions. |
| Cause | Prolonged sitting or repetitive postural positions. |
| Symptoms | Pain, specifically low back pain or hip pain. |
| Affected Areas | Hips, hamstrings, shoulders, neck, and hip flexors. |
| Treatment | Identify the source of the issue and stretch the affected muscles. |
| Prevention | Avoid sitting for prolonged periods and regularly engage in activities that maintain muscle mobility. |
| Types of Muscle Contractions | Isometric, Isotonic, Concentric, Eccentric. |
| Isometric Contraction | Muscle tension changes but the muscle length remains the same. |
| Isotonic Contraction | Muscle tension remains the same but the muscle length changes. |
| Concentric Contraction | Muscle length shortens during contraction. |
| Eccentric Contraction | Muscle lengthens during contraction. |
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What You'll Learn
Adaptive shortening
The term "adaptive" refers to muscle bellies and connective tissue adapting to the positions in which we place our bodies daily. The seated position is the most obvious position that is typically overused. Sitting for long periods can cause muscle imbalances, such as weak hamstrings and glutes, with tight quads and hip flexors. This combination results in a rounded-forward posture with a pelvic tilt.
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Muscle contraction
There are several types of muscle contractions, including isometric, isotonic, concentric, and eccentric. Concentric contractions occur when muscle tension overcomes the load, resulting in muscle shortening. For example, when performing a biceps curl, the bicep muscle contracts and shortens to lift the weight. Eccentric contractions, on the other hand, occur when the muscle lengthens as it opposes the load, such as when slowly lowering the weight back down during a biceps curl.
Adaptive shortening is a physiological process where muscles and connective tissues shorten over time due to being held in shortened positions. This commonly occurs in the hips, shoulders, and neck due to prolonged sitting or repetitive postures. It can cause stiffness, pain, and reduced mobility.
To address adaptive shortening, it is important to stretch and strengthen the affected muscles to regain and maintain mobility. Additionally, creating balance in the body by strengthening all muscles equally can help prevent pain and injury, improve balance, and protect joints.
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Tension and load
Muscle shortening and contraction are not synonymous. Tension within a muscle can be produced without a change in its length, such as when holding a heavy object in the same position. This is known as an isometric contraction, where muscle tension changes but the muscle length remains the same.
Muscle contraction can be described in terms of two variables: length and tension. Force can be differentiated as either tension or load. Tension refers to the force exerted by the muscle on an object, while load refers to the force exerted by an object on the muscle.
When a muscle contracts, it can either shorten or lengthen. A shortening contraction is called a concentric contraction, and it occurs when there is sufficient muscle tension to overcome the load, causing the muscle to shorten. For example, when performing a bicep curl or standing up from a squatting position, the bicep muscle contracts concentrically.
On the other hand, an eccentric contraction occurs when the muscle lengthens as it works to decelerate a joint at the end of a movement. This can happen involuntarily, such as when attempting to lift a weight that is too heavy, or voluntarily, such as when slowly lowering a weight.
Isotonic contraction is a type of contraction where there is constant muscle tension with a change in muscle length. This occurs when the contraction force matches the total load on the muscle. Isotonic contractions are seen in activities such as walking, running, or squatting.
Adaptive shortening refers to the process where muscles and connective tissues shorten or become "tight" over time due to being held in shortened positions for prolonged periods. This commonly occurs due to prolonged sitting or repetitive postural positions. Adaptive shortening can lead to reduced mobility, stiffness, and pain, particularly in the hips, neck, and back.
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Lengthening muscles
Muscle shortening, or adaptive shortening, occurs when muscles and connective tissues gradually shorten and become tight due to being chronically held in shortened positions. This is commonly seen in muscles around the hips, shoulders, neck, and back, often as a result of prolonged sitting or repetitive postural positions. Symptoms of adaptive shortening include pain, stiffness, and a reduced range of motion.
To lengthen muscles, it is important to identify the source of the issue and address any underlying causes. Discontinuing prolonged sitting may be beneficial, but it is not always feasible. Instead, focusing on lengthening and strengthening the shortened muscles can help improve mobility and flexibility.
Eccentric training and eccentric strengthening have been highlighted as effective methods to lengthen muscles. Eccentric exercises involve muscles lengthening while under tension or load, often referred to as the "negative" phase of an exercise. For example, during a bicep curl, the eccentric phase occurs when the weight is slowly lowered, causing the bicep muscle to lengthen while resisting the load. Eccentric exercises help improve the tissue's ability to contract while lengthening, increasing muscle length, and improving range of motion.
Nordic Hamstring Exercises, such as Nordic hamstring curls or tempo squats, are commonly recommended for eccentric training. These exercises help lengthen the hamstring, increase force production, and reduce the risk of injury. Additionally, static stretching, dynamic stretching, foam rolling, and other tools can be used to improve flexibility and range of motion alongside eccentric training.
It is important to note that simply stretching tight muscles may not always be the solution. Instead, strengthening the muscles can improve their ability to control movements through a full range of motion, reducing sensations of tightness. Therefore, a combination of eccentric training and strengthening exercises can be beneficial for lengthening muscles and improving overall physical capacity.
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Joint mobility
Joints are the points at which two or more bones meet and are responsible for movement and stability. Joint mobility refers to a joint's ability to move freely through its range of motion. Joint stability, on the other hand, is the ability of a joint to remain in a fixed position and resist unwanted movement. Joint mobility and stability are critical to the body's ability to move in a coordinated manner and provide flexibility. An appropriate balance between the two allows for optimal performance and a reduced risk of injury.
The range of motion of a joint is influenced by the configuration of bone surfaces within the joint, the joint capsule, and the ligaments, tendons, and muscles acting on the joint. Muscles that are inflexible tire more quickly, leading to muscle fatigue and an increased risk of injury. Therefore, it is important to maintain joint flexibility through stretching and exercise. Just 10 minutes of stretching three times a week can help improve the range of motion.
There are three types of range-of-motion exercises: Active Range of Motion (AROM), Passive Range of Motion (PROM), and Active Assisted Range of Motion (AAROM). AROM refers to the movement of a joint achieved entirely by the individual performing the exercise, without any outside force aiding in the movement. PROM, on the other hand, involves movement applied to a joint by another person or a passive motion machine when the individual is unable to move the joint on their own. AAROM is a combination of the two, where the joint receives partial assistance from an outside force.
In addition to stretching and range-of-motion exercises, activation drills can also help improve joint mobility and stability. These exercises stimulate the nervous system, strengthen the muscle groups around a joint, and improve posture, balance, and stability, ultimately reducing the risk of injury.
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Frequently asked questions
Adaptive shortening occurs when muscles and connective tissues shorten or become "tight" over time due to being held in shortened positions. This commonly occurs as a result of prolonged sitting or repetitive postural positions.
Shortened muscles can restrict mobility and flexibility, jam joints together, and increase the risk of pain and injury.
Lengthening shortened muscles involves stretching and strengthening them to regain lost mobility. Once mobility is regained, it's important to consistently engage in activities that maintain it.
