Athena Vale
Adaptive muscle shortening is a common issue for cyclists, caused by the repetitive motion of cycling, which involves concentric contractions (shortening) rather than eccentric contractions (lengthening). This can lead to muscle imbalances, causing problems, stress, strain, and even serious injury. To prevent and reverse adaptive muscle shortening, it is important to stretch and lengthen the shortened muscle and strengthen the lengthened muscle. This can be achieved through a corrective exercise program, which includes self-myofascial release, static stretching, and strengthening exercises.
| Characteristics | Values |
|---|---|
| Cause of muscle shortening | Lack of activity, incorrect loading, adaptive muscle shortening |
| Effect of muscle shortening | Reduced range of motion, injury, pain |
| Solution to muscle shortening | Stretching, resolving sticky adhesions, corrective exercise program |
| Types of muscle contractions | Concentric (shortening), eccentric (lengthening) |
| Types of muscle | Agonists, antagonists, stabilizers, assistors |
| Muscle imbalance | Occurs when one muscle is shortened and the other is not |
| Overactive muscles | Hypertonic, increased tone |
| Underactive muscles | Hypotonic, decreased tone |
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What You'll Learn
Adaptive shortening
When a muscle is in a shortened position for a prolonged period, it can lead to muscle tightness and a reduced range of motion. This tightness is caused by the cumulative time spent in certain positions, which affects the muscle structure. The muscle fibres shorten due to the repetitive motion, and this can lead to muscle imbalances, discomfort, and even injury.
To prevent and reverse adaptive shortening, it is essential to incorporate stretching and mobility routines into your daily life. Simple techniques and exercises, such as the Deep Squat Rest, can help improve your range of motion and flexibility. Compassionate touch and breathwork can also help improve mental, physical, and emotional health, contributing to overall well-being.
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Sticky adhesions
Muscles can feel tight or sticky due to adhesions, scar tissue, or dehydration. Adhesions are caused by a build-up of collagen that fuses with surrounding tissue fibres, such as fascia. Fascia is a layer of connective tissue that surrounds muscles, organs, and nerve fibres. It is designed to stretch as you move, but it can thicken and become sticky due to a lack of physical activity, repetitive movements, or poor posture. This can lead to reduced mobility and painful knots in the muscles, known as trigger points, which can cause myofascial pain syndrome.
Adhesions prevent muscles from sliding and gliding smoothly, which can directly affect your range of motion. Everyday movements like bending or walking may feel restricted, and muscles may get "stuck" in a shortened position, leading to compensations in other areas of the body. This creates inefficient movement and can lead to pain and injury. Therefore, it is important to address adhesions and restore smooth muscle function.
There are several methods to release sticky muscles and improve movement. One popular technique is foam rolling, which helps to loosen up adhesions and increase blood flow to the area. Muscle scraping, or Instrument Assisted Soft Tissue Mobilization (IASTM), involves using specialized tools to apply controlled pressure to tight muscle areas, breaking down scar tissue and promoting healing. Heat therapy can also help bring back tissue elasticity.
To prevent fascia-related problems, it is important to stay active and incorporate movement throughout the day. For those with desk jobs, taking breaks to stand up and move around can help keep the fascia supple. Additionally, a consistent but varied exercise routine can help maintain healthy fascia and prevent adhesions.
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Muscle imbalance
Lack of movement or a sedentary lifestyle can also cause muscle imbalances, especially in the hips. When sitting, the hip muscles contract, and the muscles responsible for extending the hips (gluteus maximus) are used less, leading to a muscle imbalance. Similarly, exercises involving single-plane movements, such as push-ups and squats, can also contribute to muscle imbalances if performed excessively.
To address muscle imbalance, targeted exercises can be employed. The Janda method, for example, treats the musculoskeletal and central nervous systems as interdependent, collectively referring to them as the sensorimotor system to achieve stability. Additionally, flexibility exercises can improve balance and enhance the range of motion by focusing on joints and moving fingers, wrists, knees, ankles, and toes.
It is important to note that muscle imbalance should not be confused with anatomically shortened muscles. Instead, it refers to a limitation in the natural range of motion, which can be caused by sticky adhesions that need to be resolved through appropriate treatments.
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Length-tension relationship
The length-tension relationship is a fundamental concept in muscle physiology, describing the connection between the length of a muscle and the force or tension it can generate. This relationship is often discussed in the context of muscle fibres, specifically sarcomeres, which are the basic units of muscle contraction.
The length-tension relationship is characterised by three main phases: the ascending limb, the plateau region, and the descending limb. At short lengths, the force or tension increases as the length of the muscle increases, which is known as the ascending limb. At intermediate lengths, there is a zero slope, or the plateau region, where the force remains relatively constant despite changes in length. Finally, at long muscle lengths, the force decreases as length increases, creating a negative slope called the descending limb.
The optimal length for tension development varies depending on the type of muscle. For skeletal muscle, the tension is typically maximal at a sarcomere length of about 2.7 μm, while for cardiac muscle, it is slightly shorter at 2.2 μm. This relationship was elucidated by the sliding filament theory, proposed by Huxley and Hanson in 1954, which suggested that tension is produced only at the region of overlap between actin and myosin filaments.
The practical implications of the length-tension relationship are important in understanding muscle function and performance. For example, in activities like cycling, repetitive concentric muscle contractions can lead to adaptive muscle shortening if not properly managed. This can impact efficiency, comfort, and even lead to injuries. Therefore, maintaining a healthy range of motion and flexibility through stretching programmes is crucial to prevent and reverse muscle shortening.
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Muscle action
Muscles are attached to bones (or sometimes other muscles or tissues) at two or more places. The attachment to a bone that remains immobile during an action is called an origin, while the attachment to a bone that moves during the action is called an insertion. For example, the triceps brachii has three bellies with varying origins (scapula and humerus) and one insertion (ulna). It is a prime mover of elbow extension, meaning it provides the primary force for this action.
Prime movers, also called agonists, are often paired with antagonist muscles on opposite sides of a joint. Antagonists provide resistance and/or reverse the movement. For example, the biceps brachii is the antagonist to the triceps brachii in elbow extension. Synergists are muscles that assist the prime mover, while stabilizers keep bones immobile when needed, such as back muscles maintaining posture.
- Concentric: when the proximal (nearest) and distal (farthest) attachments move towards each other.
- Eccentric: when the proximal and distal attachments move away from each other.
- Isometric: when the proximal and distal attachments do not move relative to each other, and the joint angle remains constant.
- Isotonic: constant muscle tension, often occurring under static conditions.
- Isokinetic: constant velocity of motion.
- Isoinertial: constant load.
It is important to note that muscles do not actually shorten. The term "contract" is now considered a less accurate description, as it was based on the understanding that muscle fibres run from one bone to another. However, muscle fibres may be in series or parallel, and the actin-myosin system behaves as a sliding filament model, with muscle filaments sliding between one another. Therefore, the term "muscle action" is preferred to describe the shortening of the distance between muscle attachments when a joint angle changes.
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Frequently asked questions
Muscle shortening, or adaptive muscle shortening, is when a muscle changes its functional resting length to adapt to the length at which it is habitually used or positioned.
Muscles will adaptively shorten when they are repeatedly contracted concentrically, rather than eccentrically. This is common in cycling, where the repetitive motion causes muscle fibres to shorten over time.
To lengthen a shortened muscle, you need to resolve any sticky adhesions of fascia, which lead to reduced relocatability of the fascia. This can be done through corrective exercises, such as stretching, or through self-myofascial release (SMR).
Overactive muscles are hypertonic, meaning they exhibit excessive tone or tension. Underactive muscles are hypotonic, meaning they lack tone. Overactive and underactive muscles are usually reflections of muscle imbalances and posture.
To prevent muscle shortening, it is important to have a balanced muscle routine that includes stretching. This is especially important for activities like cycling, where tight muscles or a limited range of motion can lead to injury.
