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Delayed-onset muscle soreness (DOMS) is muscle pain that typically starts a day or two after a workout. Eccentric exercises, which involve forcibly lengthening the contracting muscle, are a common cause of DOMS. Two causes of muscle soreness after eccentric exercise include microscopic tears in muscle fibres and the muscle's response to repair the damage through inflammation.
| Characteristics | Values |
|---|---|
| Cause of Muscle Soreness | Delayed Onset Muscle Soreness (DOMS) |
| Type of Exercise | Eccentric Exercise |
| Muscle Condition | Microscopic Tears in Muscle Fibers |
| Muscle Response | Inflammation and Repair |
| Muscle Sensation | Stiffness and Soreness |
| Time of Onset | 12-48 Hours after Exercise |
| Pain Peak | 1-3 Days after Workout |
| Adaptation | Reduced Stiffness and Soreness with Regularity |
| Prevention | Gradual Increase in Exercise Intensity |
| Treatment | Rest, Hydration, Gentle Exercise, Stretching |
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What You'll Learn
Delayed-onset muscle soreness (DOMS)
Any exercise can cause DOMS, especially when starting a new routine or increasing the intensity. However, exercises that require eccentric muscle contractions are particularly likely to cause DOMS. Eccentric contractions occur when a muscle is forcibly lengthened while contracting to bear a load against gravity. Examples of eccentric exercises include downhill running, weight training exercises such as bicep curls, and the controlled, downward motion when straightening your forearm after a bicep curl.
The unique mechanical nature of eccentric contractions places more stress on the muscles, leading to microscopic tears in the muscle fibres. This damage triggers the body's repair response, releasing enzymes and increasing inflammation, resulting in muscle soreness and tenderness. The pain typically peaks about one to three days after the workout and then gradually improves.
While muscle soreness is often associated with a good workout, excessive or persistent soreness can hinder muscle recovery and negatively impact athletic performance. It is important to listen to your body and allow for adequate rest and recovery. Maintaining muscle activity through gentle exercises like walking or swimming can improve blood supply and speed up healing. Cross-training with different muscle groups and ensuring proper warm-up, cool-down, and stretching routines can also help manage and prevent DOMS.
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Muscle damage
Muscle soreness after eccentric exercise is caused by muscle damage. Eccentric exercises involve contracting muscles forcibly lengthening to bear a load against gravity. Examples include downhill running, walking downstairs, and the downward motion of a bicep curl.
During eccentric exercise, the muscle undergoes a unique mechanical process that differentiates it from concentric contractions, where the muscle shortens. The force generated by a muscle when lengthening is distinct from the force generated when it shortens. This means that the muscle is placed under more stress, which can lead to damage.
The damage caused by eccentric exercise can be observed at both the macroscopic and microscopic levels. At the macroscopic level, the muscle cell's cytoskeleton is disrupted, specifically the cytoskeletal protein desmin. This disruption occurs within minutes of the exercise. At the microscopic level, there is evidence of tiny, microscopic tears in the muscle fibres. These tears occur when muscles are stressed in a new way or beyond their capacity.
The body responds to this damage by releasing enzymes to repair the tears, which results in inflammation and soreness. This soreness is known as Delayed Onset Muscle Soreness (DOMS) and can last several days. DOMS is characterised by muscle tightness, tenderness, and pain. It is important to note that soreness does not always indicate a beneficial workout, and excessive soreness can hinder muscle recovery and athletic performance.
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Muscle repair
The repair process for DOMS typically takes a few days to complete. During this time, it is beneficial to keep the muscles active through gentle exercises like walking or swimming. Maintaining muscle activity improves blood supply and accelerates healing. However, it is important to listen to your body and understand the difference between moderate soreness and excessive pain. In cases of severe DOMS, complete rest for a day or more may be necessary to allow the muscles to recover.
To facilitate muscle repair and alleviate soreness, proper nutrition is essential. Consuming a balanced diet that includes all food groups provides the body with the necessary nutrients to support the healing process. Additionally, staying hydrated before, during, and after exercise has been shown to significantly reduce muscle soreness.
While muscle soreness is a common occurrence after eccentric exercises, it is important to be mindful of the intensity and frequency. Excessive or persistent soreness can hinder muscle recovery and negatively impact athletic performance. Cross-training by engaging different muscle groups allows for recovery time between workouts without interrupting your training regimen.
In summary, muscle repair involves addressing the microscopic tears in muscle fibres caused by strenuous exercise. This repair process triggers inflammation and soreness, known as DOMS. By staying active, maintaining proper nutrition and hydration, and varying workout routines, individuals can effectively manage and reduce muscle soreness while promoting repair and recovery.
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Muscle adaptation
Muscle soreness after eccentric exercise is a result of microscopic tears in the muscle fibres, which the body repairs by increasing inflammation. This is known as Delayed Onset Muscle Soreness (DOMS) and can occur regardless of fitness level, when muscles are challenged in a new way or beyond their capacity.
During eccentric exercise, the contracting muscle is forcibly lengthened, which is a unique feature of this type of exercise. The muscle fibres undergo damage, and the body responds by repairing the tears, which leads to the sensation of soreness. This soreness is an indication that the muscle has been worked, but excessive soreness can hinder muscle recovery and athletic performance.
The good news is that muscles can adapt to eccentric exercise, reducing the severity of DOMS. This is known as muscle adaptation, and it occurs when the body is exposed to a new stimulus and responds by becoming more resilient. In the case of eccentric exercise, a second bout of exercise a week after the first results in less stiffness and soreness. This is because the muscle has adapted to the new stress, and this adaptation provides an opportunity for clinical applications, such as protecting the muscle against more severe injuries.
The process of muscle adaptation involves a series of changes at the cellular level. One proposed mechanism is an increase in sarcomere number in muscle fibres, which leads to a shift in the muscle's optimum length for active tension. This shift may contribute to the reduced soreness experienced after subsequent bouts of eccentric exercise.
Additionally, keeping muscles active through gentle exercises like walking or swimming can improve blood supply and speed up healing, aiding the muscle adaptation process. Cross-training with exercises targeting different muscle groups can also provide recovery time between workouts, allowing muscles to adapt and grow stronger.
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Muscle contraction
Muscle soreness after eccentric exercise is caused by microscopic tears in the muscle fibres. Eccentric exercises involve contracting muscles while lengthening them, which can lead to muscle damage and soreness. This is known as delayed-onset muscle soreness (DOMS) and can occur even in elite athletes when they increase their training intensity or start a new exercise routine.
During eccentric contractions, the muscle is forcibly lengthened, which is mechanically distinct from the force generated when the muscle shortens. This unique feature of eccentric exercise can cause damage to muscle fibres and lead to muscle soreness. The muscle tissue responds to the tears by releasing enzymes to repair the damage, which results in inflammation and soreness.
One example of an eccentric exercise is downhill walking, where the quadriceps muscle controls the rate of knee flexion against the force of gravity. This type of exercise can cause muscle soreness due to the forced lengthening of the activated muscle. The soreness typically starts a day or two after the workout and can last for several days.
Another cause of muscle soreness after eccentric exercise is the disruption of the muscle cell's cytoskeleton. The forced lengthening of the muscle leads to specific disruptions of proteins within the cell known as cytoskeletal proteins. This disruption may contribute to the mechanisms of injury and subsequent muscle soreness.
Additionally, a second period of eccentric exercise, performed a week after the first, can result in reduced muscle damage and soreness. This is due to the muscle's ability to rapidly adapt and protect itself from further injury. The adaptation process may involve an increase in sarcomere number in muscle fibres, leading to a shift in the muscle's optimum length for active tension.
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