It’s All Connected: How Strength Levels Affect Work Capacity and Body Composition
The Muscle Work Capacity Brachioradialis
When it comes to the muscles of your body, there are two types of fibers. Type I fibers are fast twitch and type II fibers are slow twitch.
Fast twitch muscle cells produce maximum force with little energy expenditure while slow twitch muscle cells require a great deal of energy but have high strength levels. There is no such thing as a “slow” or “fast” fiber; they all respond similarly to training stimuli.
Type I fibers are found primarily in the upper body and include the biceps, triceps, deltoids, pectorals, traps and lats. These fibers provide power for punching and throwing heavy objects.
They are responsible for generating large amounts of force when performing pull ups and chin ups. For example, if you want to lift a weight up from the floor using only your arms then you would use type I fibers (Figure 1).
Fast twitch muscle fibers also produce lactic acid which causes that burning sensation in muscles that are heavily worked. If you were to pick up a weight off of the floor using only your arms and hold it at your waist then the muscles that you use would feel a burning sensation.
This is because type I fibers predominate in these muscles and they produce a lot of force but fatigue quickly.
Lifting a weight from the floor and holding it at your waist only uses your arm muscles. This means that you could hold this position forever because the weight on the bar is very light.
If you were to perform a chin-up exercise then you would be able to lift your entire bodyweight using only your arms. This involves lifting your chest up to the bar and back down again. You will be able to lift your own body weight ten times without too much effort. As you become stronger and fitter, your strength and power increases.
Muscle Work Capacity Forearm
The forearm muscles are also divided into type I and type II muscle fibers. The muscles of the forearm cross the wrist and the back of the hand.
They allow you to make a fist and curl weights. The muscles in the front of your forearm bend your fingers. The extensors are on the back of your forearm and are used to straighten your fingers. The muscles that bend your wrist back are called the supinators, while the muscles that bend your wrist forward are called the pronators.
The extensors are type I muscle fibers and the other forearm muscles are type II muscle fibers (Figures 2 and 3). This means that they are able to produce large amounts of force but fatigue quickly.
The forearm muscles bend and straighten the wrist and fingers. When you make a fist or hold something in your hand the muscles that bend your wrist backwards contract.
If you hang from a bar and let your arms swing down then the muscles that bend your wrist forwards contract.
The muscles that bend your fingers are called the flexors. The extensor muscles straighten your fingers.
The muscles that bend your wrist inwards are called the supinators and the muscles that bend your wrist outwards are called the pronators.
These forearm muscles are very important when using a punching technique because they protect the bones in your wrist and allow you to grip onto something without excessive strain on your wrist joint. This is especially important for martial artists who practice full contact fighting.
The forearms are very susceptible to injury caused by overuse or sudden, heavy impact. Most martial artists use their hands for punching and blocking, which can easily lead to pain and injury.
Without the proper training, martial artists are more likely to injure themselves than their opponent. It is important that you learn how to punch without hurting yourself in the process.
The most common types of injuries are fractures, sprains and dislocations. The bones of the forearm are frequently fractured as a result of blocking a punch or a fall.
These types of fractures usually involve the bone splitting or breaking.
If the skin is broken then you are at risk of developing an infection. You should seek medical help if you experience any of the following symptoms: redness and swelling, warm to touch, increasing pain, fever or pus from the wound.
Tendon injuries are also common among martial artists. The most common types of tendon injuries involve the wrist extensors and the forearm pronators.
Tendon injuries can be very painful and may prevent you from practicing your art. Usually, these types of injuries heal well with rest and patience. However, some tendon injuries are so bad that surgery may be required in order to repair them.
Sprains and dislocations are also relatively common in martial artists and can occur to anyone. The wrist and hand are highly flexible and the small bones can be easily misaligned.
In order to prevent yourself from spraining or dislocating a wrist or finger you should always wear gloves when practicing your art. Using incorrect technique when punching or blocking may put you at risk of spraining or completely misaligning one of the small bones in your hand or wrist.
You may experience pain, tenderness or swelling. A sprain causes a stretched or torn muscle or tendon.
In order to heal, you should keep the injured area elevated and apply ice to reduce the swelling. A dislocation is when a bone slips out of its joint causing the joint to look weird and unnatural. This can be extremely painful and requires medical attention.
One of the most common martial arts injuries is the tearing of muscles and tendons. This is most common among martial artists who do not warm up before practicing their forms, or those who repeatedly practice incorrect form.
A muscle strain is when a muscle tears and you will experience severe pain and weakness in that area. There is a high risk of re-injuring a muscle that has already torn, so it is very important to let it heal properly.
You can reduce the risk of muscle strain by warming up before practicing your form, and by practicing the correct form. If you feel any pain or discomfort while practicing, then stop immediately and do not continue until the pain subsides.
Continuing to practice when you are hurt can lead to a more severe injury.
Tendonitis is when the tendon becomes inflamed due to overuse. Repeating the action that caused the injury will cause severe pain.
Applying ice and taking over the counter medication can help with the swelling and pain. In extreme cases you may need to see a doctor. Rest is very important when treating tendonitis.
Next, we will discuss ring (or mat) burns. It is not uncommon for martial artists to have ring (or mat) burns.
They are most common for those who practice forms that involve a lot of sliding such as Tai Chi. Some martial artists perform their forms in bare feet; this is a major reason why they get ring (or mat) burns. Even if you wear shoes, you can still get ring (or mat) burns.
Common symptoms of ring (or mat) burns include redness and pain. If you feel any abnormality then you should seek immediate medical attention.
The best way to avoid ring (or mat) burns is to wear shoes and to not perform your forms in bare feet.
Next, we will discuss blood blisters. Blood blisters are very common among martial artists who practice forms that require a lot of knuckle and finger movement.
Common symptoms include redness, swelling and pain around the affected area.
Sources & references used in this article:
The loss of skeletal muscle strength, mass, and quality in older adults: the health, aging and body composition study by BH Goodpaster, SW Park, TB Harris… – The Journals of …, 2006 – academic.oup.com
Transdermal testosterone gel improves sexual function, mood, muscle strength, and body composition parameters in hypogonadal men by C Wang, RS Swerdloff, A Iranmanesh… – The Journal of …, 2000 – academic.oup.com
The Long-Term Benefits of a Multicomponent Physical Activity Program to Body Composition, Muscle Strength, Cardiorespiratory Capacity, and Bone Mineral Density … by JM Cancela, CA Perez, LP Rodrigues… – Rejuvenation …, 2020 – liebertpub.com
Longitudinal changes in body composition in older men and women: role of body weight change and physical activity by VA Hughes, WR Frontera, R Roubenoff… – … American journal of …, 2002 – academic.oup.com
Iron deficiency and reduced work capacity: a critical review of the research to determine a causal relationship by JD Haas, T Brownlie IV – The Journal of nutrition, 2001 – academic.oup.com
Conjugated linoleic acid reduces body fat mass in overweight and obese humans by H Blankson, JA Stakkestad, H Fagertun… – The Journal of …, 2000 – academic.oup.com
A cross-sectional study of muscle strength and mass in 45-to 78-yr-old men and women by WR Frontera, VA Hughes, KJ Lutz… – Journal of applied …, 1991 – journals.physiology.org