Alec Titan
There are more than 600 muscles in the human body, and they are all susceptible to injury and health conditions. Muscle strength testing is an important component of a physical exam that can reveal information about neurologic deficits and evaluate weakness. There are various ways to test muscle strength, including the Medical Research Council Manual Muscle Testing scale, which involves testing key muscles and grading the patient's strength. Additionally, there are muscular potential calculators that can estimate an individual's muscle-building potential based on factors such as genetics, bone structure, muscle belly length, and muscle fiber dominance. These calculators can provide insights into an individual's potential for muscle growth.
| Characteristics | Values |
|---|---|
| Muscle strength testing | Can reveal information about neurologic deficits and is used to evaluate weakness |
| Muscle strength grading | Can differentiate true weakness from imbalance or poor endurance |
| Muscle strength evaluation | May be performed by nurses, physicians, physical therapists, occupational therapists, chiropractors, and other practitioners |
| Muscle belly length | The longer a muscle belly is, the more potential it has for size |
| Muscle fibres | The two main types are fast twitch fibres, which are responsible for explosive strength, and slow twitch fibres, which are responsible for endurance |
| Maximising muscle growth | Eat 0.8-to-1 gram of protein per pound of body weight per day |
| Maximising muscle gain | Maintain a calorie surplus of about 10% |
| Bone structure | Can help predict your lifetime muscle gain potential |
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What You'll Learn
Muscle strength testing
The most commonly accepted method of evaluating muscle strength is the Medical Research Council Manual Muscle Testing scale. This method involves testing key muscles from the upper and lower extremities against the examiner’s resistance and grading the patient’s strength on a 0 to 5 scale accordingly. Commonly tested muscles include the shoulder abductors, elbow flexors, elbow extensors, wrist extensors, finger flexors, hand intrinsics, hip flexors, knee extensors, dorsiflexors, great toe extensor, and plantar flexors.
If the patient is unable to engage the muscle with gravity eliminated, the examiner should place a hand on the muscle and ask the patient to contract his or her muscles again. This allows the examiner to feel for a muscle twitch, even if a twitch is not visible. This observation would differentiate a score of 0 from a score of 1. When the patient demonstrates the full range of motion with gravity eliminated, the test should be repeated against gravity for the full range of motion. If this is successful, the patient should be challenged by the addition of a small degree of resistance, then maximal resistance by the examiner.
The Oxford Scale is another commonly accepted scale that does not require special equipment and demonstrates reasonable inter-rater reliability. More precise methods of measurement, such as hand-grip dynamometry, are less subjective and provide a quantifiable measurement that can be tracked over time.
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Muscle belly length
The muscle belly is the meaty part of a muscle. The length of the muscle belly determines the potential for muscle size. For example, if the muscle belly is short and the calves are high, the potential for muscle growth is lower than in the case of longer muscle bellies. High-level bodybuilders tend to have long muscle bellies, which make them look more muscular.
The length of the muscle belly is determined by genetics. The biceps, for instance, can vary in length from person to person. While stretching can add length to the muscle fibres, this is at a microscopic level and will only have a limited impact on overall muscle length.
The best way to change the shape of muscles is through resistance training. Barbell curls, for example, are a great overall mass builder and should be part of a biceps routine. However, cambered-bar preacher curls can help target the lower bicep area.
While muscle building potential is largely determined by genetics, there are other factors that can be controlled to maximise muscle growth. These include training, diet, and lifestyle.
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Fast-twitch vs slow-twitch muscle fibres
The two main types of muscle fibres are fast-twitch and slow-twitch. Fast-twitch muscle fibres are responsible for explosive strength and grow at a faster rate and get bigger overall when compared to slow-twitch fibres. They are used for activities that require a sudden burst of energy, like sprinting or hopping. They fatigue quickly as they use up a lot of energy in a short space of time.
Slow-twitch muscle fibres, on the other hand, are responsible for endurance and power low-intensity activities. They are used for activities that require muscles to work for a long time, like long-distance running. They have a bigger blood supply and more blood vessels, and they need a good, constant supply of blood and oxygen to function. They use an aerobic energy system, which means they run on oxygen and can work for a long time without getting tired.
Most people are born with about the same amount of both types of muscle fibres, but some may have more of one type, which might make them better at certain sports. For example, those with more slow-twitch fibres might be better at endurance sports, while those with more fast-twitch fibres might excel at sprinting events.
It is possible to "change" muscle fibres to some extent through training. For example, long-distance runners will have longer slow-twitch fibres, while those who lift weights or sprint will have bigger fast-twitch fibres. However, training cannot make slow-twitch fibres as powerful as fast-twitch, nor can it make fast-twitch fibres as fatigue-resistant as slow-twitch.
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Genetic factors
Genetics plays a significant role in determining an individual's muscle viability. Genetic factors can influence muscle growth, strength, and overall athletic performance. While the specific genetic underpinnings are complex and not yet fully understood, certain genes and genetic variations have been identified that impact muscle viability.
One key genetic factor that affects muscle growth and strength is the distribution of muscle fiber types. There are two main types of muscle fibers: slow-twitch (Type I) and fast-twitch (Type II). Slow-twitch fibers contract slowly but can work for extended periods without tiring, making them ideal for endurance activities like long-distance running. On the other hand, fast-twitch fibers contract quickly and are associated with explosive power and strength, benefiting activities such as sprinting or weightlifting. Genetic variations can influence the ratio of Type I to Type II fibers in an individual's muscles, impacting their athletic performance and muscle growth potential.
The ACTN3 and ACE genes, for example, are associated with athletic performance and influence muscle fiber type. The ACTN3 gene provides instructions for making alpha-actinin-3 protein, predominantly found in fast-twitch muscle fibers. A variant called R577X leads to the production of an abnormally short form of this protein, which is quickly broken down. This genetic variation can impact an individual's muscle strength and endurance capabilities.
Additionally, genetics can influence muscle protein synthesis, the process by which muscles repair and grow after exercise. Some people have a greater capacity for protein synthesis, allowing them to build muscle more efficiently. Genetic factors can also impact hormone production and nutrient utilization, both of which play a role in muscle growth and maintenance. For instance, genes regulating testosterone levels can indirectly impact muscle tissue, as low testosterone can make developing muscle mass more challenging.
While genetics plays a crucial role in muscle viability, it is important to remember that environmental factors and training methods also significantly contribute to muscle growth and performance. Understanding one's genetic predispositions can help tailor training and nutrition strategies to optimize muscle development and overall health. Genetic tests can provide valuable insights into muscle fiber type, hormone levels, and nutrient utilization, allowing individuals to design personalized workout, nutrition, and supplement plans to maximize their muscle-building potential.
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Muscle soreness
There are two types of muscle soreness: acute muscle soreness and delayed-onset muscle soreness (DOMS). Acute muscle soreness is the burning sensation felt during or immediately after a workout due to a quick buildup of metabolites during intense exercise. It usually disappears shortly after exercising. DOMS, on the other hand, normally starts a day or two after a workout and is caused by muscle damage and microscopic tears, not lactic acid buildup as previously thought.
There are several ways to ease post-workout muscle soreness. Staying hydrated is important, as dehydration can intensify and prolong soreness. Massages can also help to relieve tension and restore blood flow to sore muscles, and gentle stretching can prevent stiffness while muscles recover. Using a foam roller can increase blood flow to the muscles through applied pressure. While it may not be feasible to get a massage after every workout, self-massage with oil or lotion can also help.
If muscle soreness persists for more than a few days or worsens despite rest, it could be a sign of a more serious issue that requires professional care. It is important to know the difference between muscle soreness and an overuse injury. If you are unable to flex and extend your limbs without pain after a couple of days, you should consult a doctor.
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Frequently asked questions
Checking muscle viability is best done by a healthcare professional. They can perform a muscle strength test to evaluate weakness and differentiate it from imbalance or poor endurance. This can be done by a nurse, physician, physical therapist, chiropractor, or other qualified practitioners.
The most commonly accepted method of evaluating muscle strength is the Medical Research Council Manual Muscle Testing scale. This involves testing key muscles against the examiner's resistance and grading the patient's strength on a scale of 0 to 5. Commonly tested muscles include shoulder abductors, elbow flexors, and finger flexors.
If you experience long-term muscle pain, weakness, or other symptoms such as trouble breathing or swallowing, you should seek medical advice. A healthcare provider can determine if a muscle strength test is necessary and advise on the best course of action.
Yes, there are several ways to improve muscle strength. These include consuming an adequate amount of protein, focusing on compound exercises, and maintaining a calorie surplus. It is also important to note that getting enough sleep and rest is crucial for muscle recovery and growth. Additionally, factors such as genetics, bone structure, and muscle fiber type can influence an individual's muscle-building potential.
