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The human body is an organism with interdependent systems, with over 600 muscles that help us move, breathe, and survive. Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse. This can impair movement coordination, proprioception, and muscle reaction time, which are crucial for maintaining postural balance. While most discussions revolve around the benefits of training local muscles versus global muscles, there is no consistent definition or agreement on which muscles are classified as local or global. Bergmark categorized muscles that stabilize the spine as either local or global, with the transversus abdominis and multifidi being local muscles. However, other sources suggest that the rectus abdominis, deltoid, and transverse abdominis are composed of both local and global muscle fibers. Understanding the distinction between local and global muscles can help design targeted exercise protocols and intervention programs for specific muscle groups and injuries.
| Characteristics | Values |
|---|---|
| Definition | Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse. |
| Muscles | The transversus abdominis (TA) and multifidi are local muscles, whereas the erector spinae, quadratus lumborum, obliques, and rectus abdominis are global muscles. |
| Functions | Most muscles in the forearms are named based on their function because they are located in the same region and have similar shapes and sizes. |
| Types | There are three types of muscle tissue: Visceral, cardiac, and skeletal. |
| Number | There are more than 600 muscles in the human body. |
| Weight | Muscles make up roughly half of a person's body weight. |
| Composition | Muscles are made of thousands of small fibers woven together. |
| Control | Skeletal muscles are voluntary — they move when you think about moving that part of the body. |
| Training | Low load and high rep exercises utilize muscles with more type I fibers, while high load, high velocity, and low rep exercises utilize more type II fibers. |
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What You'll Learn
Localized muscle fatigue
Several studies have investigated the effects of localized muscle fatigue on dynamic balance and postural control. One study focused on the impact of neuromuscular fatigue on calf muscle activation strategies and found that while it did affect those strategies, it did not impact dynamic postural balance control in healthy young adults. Another study examined the effects of exercise-induced fatigue on postural control of the knee, specifically looking at individuals with and without patellofemoral pain syndrome.
The recovery process from localized muscle fatigue is also an important area of research. It has been found that the recovery of a muscle appears to depend on the state from which it starts its recovery, rather than the exertion history. Additionally, the development of testable hypotheses and experiments has helped enhance our understanding of fatigue and recovery processes, with the potential to improve muscle performance and reduce the risk of musculoskeletal injuries.
In terms of practical applications, understanding localized muscle fatigue can be beneficial in occupational environments. For instance, the effect of cycle time on the development of localized muscle fatigue during intermittent isometric exertions has been studied, with shorter cycle times resulting in less fatigue development. Furthermore, the discussion surrounding "local" and "global" muscles has sparked interest, with some suggesting that local muscles need to be developed before efficient global muscles can be achieved. However, others argue that specific exercise protocols are not necessary for local or global muscles, and that a combination of low-load high-rep and high-load low-rep exercises is ideal for targeting both muscle types.
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Local vs global muscles
Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse. It impairs movement coordination, proprioception, and muscle reaction time, which are crucial for maintaining postural balance. Local fatigue may not necessarily reduce the ability to perform a specific task, as most daily activities involve submaximal force using synergistic muscle groups.
There is no consistent definition for "local" and "global" muscles, making it challenging to draw conclusions about their differences. However, Bergmark categorized muscles that stabilize the spine as either local or global. According to this classification, the transversus abdominis (TA) and multifidi are local muscles, while the erector spinae, quadratus lumborum, obliques, rectus abdominis, and other muscles are considered global.
The rotator cuff, rectus abdominis, deltoid, and transverse abdominis are composed of both Type I and Type II muscle fibers, which respond to loading and tasks rather than specific roles like stability or mobility. Training can lead to a shift in fiber type over time. Instead of focusing solely on local or global muscles, it is beneficial to incorporate a mix of low-load high-rep exercises and high-load low-rep exercises, as they target different muscle fiber types and improve endurance and explosive activities.
Some studies have explored the impact of core strength exercises on athletic performance. One experiment compared athletes who performed core strength exercises with those who did conventional strength exercises. The results showed that core strength exercises significantly improved grip strength, vertical jump, and the quality of explosive force in athletes. Another study examined the influence of head position during the prone plank exercise on core muscle activity and found that head flexion led to increased abdominal activation compared to neutral and extension positions.
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Muscle fibre types
Muscle fibres are the cells that make up skeletal muscles. There are over 600 skeletal muscles in the human body, comprising around 40% of body weight in healthy young adults. Skeletal muscles are part of the voluntary muscular system and are attached by tendons to bones to enable skeletal movement.
Skeletal muscle fibres can be classified based on two criteria: the speed of contraction and how they regenerate adenosine triphosphate (ATP). Using these criteria, there are three main types of skeletal muscle fibres: slow oxidative (Type I), fast oxidative (Type IIa), and fast glycolytic (Type IIx).
Slow oxidative fibres contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. They use aerobic metabolism to produce low-power contractions over long periods and are slow to fatigue.
Fast oxidative fibres contract relatively quickly and primarily use aerobic respiration to generate ATP. They produce higher-tension contractions than slow oxidative fibres.
Fast glycolytic fibres have the fastest contractions and rely on anaerobic glycolysis as their primary ATP source. They have a large diameter and contain large volumes of glycogen used in glycolysis to generate ATP quickly. Due to their anaerobic metabolism, these fibres do not have substantial numbers of mitochondria, a limited capillary supply, or significant amounts of myoglobin, resulting in a white colouration. Fast glycolytic fibres fatigue quickly and can only be used for short periods. However, they enable rapid and forceful contractions associated with quick, powerful movements.
It is important to note that most skeletal muscles contain all three types of fibres, although the proportions may vary. Additionally, there is evidence that training can shift fibre type over time. For example, endurance training can modify slow fibres to be more efficient by increasing the number of mitochondria and promoting more aerobic metabolism and ATP production.
The type of exercise performed can also influence muscle fibre recruitment. Low-load, high-repetition exercises tend to utilise muscles with more Type I fibres, which are better suited for endurance-based activities. In contrast, high-load, high-velocity, low-repetition exercises will engage more Type II fibres.
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Muscle groups
The human body has more than 600 muscles, which are responsible for everything from keeping us alive to moving our bodies. These muscles are made up of thousands of small fibres woven together, and they work together to move us.
Muscles are organised by tissue type, and there are three types of muscle tissue: visceral, cardiac, and skeletal. Visceral muscle is the weakest type of muscle tissue, and it is found inside organs like the stomach, intestines, and blood vessels. Cardiac muscle, meanwhile, is found only in the heart and is responsible for pumping blood throughout the body. Cardiac muscle tissue, like visceral muscle, cannot be controlled consciously. Skeletal muscles, on the other hand, are voluntary muscles that work with the bones, tendons, and ligaments of the musculoskeletal system to support our weight and move us.
While there is no consistent definition, muscles can also be classified as either "local" or "global". Local muscles are those that stabilise the spine, such as the transversus abdominis (TA) and multifidi. Global muscles, on the other hand, include the erector spinae, quadratus lumborum, obliques, and rectus abdominis. However, some muscles, like the rotator cuff, rectus abdominis, deltoid, and transverse abdominis, are composed of both type I and type II fibres.
In terms of exercise, it is beneficial to do both low-load high-rep exercises and high-load low-rep exercises, as this will utilise both type I and type II muscle fibres. Type I fibres are better for endurance-based activities, while type II fibres are better for high-velocity, endurance activities. It is important to note that you do not need to develop type I fibres before developing type II fibres.
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Muscle function
The human body has more than 600 muscles, which are responsible for everything from breathing to performing complex voluntary movements. Each muscle is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves.
Muscles are sometimes classified by the type of function they perform. For example, the flexor group of the forearm flexes the wrist and fingers, while the supinator supinates the wrist, allowing it to roll over to face palm up. In the leg, adductors are muscles that adduct, or pull together, the legs.
Skeletal muscles are part of the musculoskeletal system and work with bones, tendons, and ligaments to support the body's weight and enable movement. They are voluntary muscles, meaning they move when you consciously decide to move that part of your body. Some skeletal muscle fibres contract quickly and use short bursts of energy, while others, like back muscles, work more slowly to aid posture.
Muscles can also be categorized as local or global. For instance, the transversus abdominis (TA) and multifidi are local muscles, whereas the erector spinae, quadratus lumborum, obliques, and rectus abdominis are global muscles. However, the distinction between local and global muscles is not always clear-cut, and some muscles, like the rotator cuff, rectus abdominis, deltoid, and transverse abdominis, are composed of both type I and type II fibres.
Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse. It can impair movement coordination, proprioception, and muscle reaction time, which are essential for maintaining postural balance.
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Frequently asked questions
Localized muscles are those that stabilize the spine, such as the transversus abdominis (TA) and multifidi.
Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse.
Localized muscle fatigue can impair movement coordination, proprioception, and muscle reaction time, which are essential for maintaining postural balance.
Localized muscle fatigue can be measured using models like the three-compartment controller with enhanced recovery (3CC-r) model, which has been validated using different objective functions and data types.
Localized muscle fatigue may not always reduce the ability to perform specific tasks. Most daily activities involve submaximal force using multiple muscle groups, so the onset of local fatigue may not significantly impact performance.
