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Muscle strains, or pulled muscles, are a common but painful injury. They are caused by microscopic tears in the muscle fibres, which can be damaged to varying degrees. The tears can be caused by overstretching, overusing, or improperly using the muscle. This can lead to soreness, stiffness, weakness, swelling, and spasms. In more severe cases, a complete muscle tear may occur, requiring surgery to stitch the muscle back together. In some cases, muscle damage can lead to rhabdomyolysis, a serious condition where muscle fibres die and release their contents into the bloodstream, potentially causing kidney failure. However, muscle damage is also believed to be a mechanism for muscle growth, as the repair process involves rebuilding the muscle to be bigger and stronger.
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What You'll Learn
Muscle strains
There are several risk factors that can contribute to muscle strains, including muscle stiffness, imbalances, and previous injuries. When muscles are tight and inflexible, the fibres are more prone to breaking. Favouring certain muscles over others can also lead to imbalances and weaken the underused muscles. Additionally, muscles that have been previously torn are more likely to tear again.
The symptoms of a muscle strain include sudden pain, swelling, bruising, loss of strength, and reduced range of motion. The severity of a strain can be assessed by the loss of strength and range of motion, which can also indicate the expected recovery time. Healthcare providers classify muscle strains into three grades based on their severity: Grade 1 involves minor damage with a few broken fibres, Grade 2 involves more extensive damage with more fibres affected, and Grade 3 involves a complete tear of the muscle.
Treatment for muscle strains typically involves the RICE method: rest, ice, compression, and elevation. This helps relieve pain and inflammation during the initial days of recovery. After a few days, gentle movement can be introduced. In severe cases, surgery may be required to stitch the torn ends of the muscle back together.
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Muscle stiffness
Stiff muscles can also be caused by microscopic tears in the muscle fibres, which can happen during or after exercise. This is known as delayed onset muscle soreness (DOMS) and is characterised by localised tenderness and soreness. DOMS typically peaks between 24 to 72 hours after exercise and disappears after five to seven days.
To relieve muscle stiffness, it is recommended to rest, stretch, exercise more frequently, and improve your posture. Over-the-counter pain relievers, such as nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, can also help. If muscle stiffness lasts more than a few days or is accompanied by other symptoms, it is advised to consult a healthcare provider.
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Microtears
Muscle strains, or pulled muscles, are common soft tissue injuries. They are caused by overworking muscles, which weakens the fibres. This can happen when muscles are stretched and pulled, or when they are contracted forcefully. Strains can be mild, moderate or severe, with mild strains breaking only a few fibres and severe strains tearing all the way through the muscle.
When microtears occur, the body sends increased blood flow and nutrition to the affected area to heal it. This process, known as hypertrophy, leads to the growth of new muscle mass and increased muscle strength. However, it is important to allow muscles adequate time to recover between workouts, as repetitive microtrauma that are not allowed to heal can result in more serious conditions. Rest, proper nutrition and hydration are critical to the muscle repair process.
To maximise hypertrophy and minimise the risk of overfatigue, it is recommended to seek guidance from a strength coach or athletic trainer. It is also important to warm up before strength training to prevent cramping and injury, and to cool down with static stretches. Additionally, it is suggested to vary workouts and choose activities that do not target the same muscle groups to allow for active rest.
Overall, microtears are a natural and beneficial part of muscle growth, but proper recovery and rest are essential to prevent further injury and promote healthy muscle development.
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Exercise-induced muscle damage (EIMD)
EIMD can have a significant impact on athletic performance and training quality, particularly for individuals with limited recovery time between training sessions or competitions. The negative outcomes of EIMD can be mitigated through various interventions, including nutritional and pharmacological strategies, electrical and manual therapies, and exercise. Nutritional interventions targeting oxidative stress and inflammation have been explored, but the long-term use of supplements and functional foods to manage EIMD is debated.
Some nutritional strategies that have been studied include the use of antioxidants, beta-hydroxy-beta-methylbutyrate, protein ingestion before and after exercise, and omega-3 fatty acid supplementation. Additionally, prior eccentric exercise has been shown to have a protective effect against subsequent damaging exercise.
The recovery process for EIMD involves rest, ice, compression, and elevation to manage pain and inflammation. This is followed by a gradual return to movement to aid in the healing process and prevent chronic pain. Overall, EIMD is a well-studied phenomenon with a range of interventions available to prevent and treat its negative effects.
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Muscle cramps
Certain groups of people are more prone to muscle cramps, including pregnant women, individuals over the age of 65, and people with obesity. Additionally, athletes and those who engage in physical exercise may experience muscle soreness after intense or unaccustomed activity, known as delayed onset muscle soreness (DOMS). This typically peaks between 24 to 72 hours after exercise and can last up to seven days. DOMS is characterised by localised tenderness, soreness, prolonged strength loss, reduced range of motion, and elevated levels of creatine kinase in the blood, indicating muscle damage.
To prevent and treat muscle cramps, it is recommended to stretch the muscles, especially before and after exercising. Staying hydrated is also important, and sports drinks can help replace electrolytes lost during intense or hot workouts. In some cases, healthcare providers may prescribe medications to prevent cramps, but these may have side effects and are not always effective. If muscle cramps are chronic and accompanied by symptoms like pain, muscle weakness, or poor coordination, it is advised to consult a healthcare professional to rule out any underlying neurological issues.
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Frequently asked questions
Damaged muscle fibers occur when the internal structures of a muscle fiber or its outer wrapping layers are harmed. This can be caused by microscopic tears, muscle strains, or pulls, which can be mild or severe.
Muscle fibers can become damaged due to various reasons, including overexertion, improper use, or external trauma. In the case of athletes, this often occurs in contact sports or during periods of rapid acceleration and deceleration.
The healing process for damaged muscle fibers involves rest, ice, compression, and elevation to reduce pain and inflammation. The body then repairs the fibers by fusing them, increasing muscle mass and strength. Adequate rest, a balanced diet, and hydration are crucial for effective healing.
Signs and symptoms of damaged muscle fibers include muscle soreness, stiffness, weakness, swelling, and spasms. More severe damage may result in muscle pain, dark urine, and in extreme cases, kidney failure if the contents of the muscle fibers leak into the bloodstream.
