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Muscle fatigue is a commonly experienced phenomenon that limits athletic performance and other strenuous or prolonged activity. It can be described as a feeling or sensation of weakness or muscle pain. Physiologists, however, have a more restricted definition of muscle fatigue, which they describe as a failure to maintain the required or expected force. Muscle fatigue can occur following a period of sustained activity, and there are several factors that contribute to it. These include impaired blood flow, ion imbalance within the muscle, nervous fatigue, and the accumulation of lactic acid in the muscle.
| Characteristics | Values |
|---|---|
| Definition | A reversible decline in an objective measure of performance (i.e. maximum voluntary contraction) that occurs as a result of both submaximal and maximal exercise |
| Causes | Accumulation of metabolites within muscle fibres, generation of an inadequate motor command in the motor cortex, depletion of necessary substances, accumulation of catabolites, decrease in the number of recruited motor units and their discharge rate |
| Types | Central fatigue, peripheral fatigue |
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What You'll Learn
- Muscle fatigue is a decline in performance, limiting athletic performance and strenuous activity
- It can be caused by the accumulation of metabolites within muscle fibres
- It can also be caused by the generation of an inadequate motor command in the motor cortex
- Peripheral fatigue is produced by changes at or distal to the neuromuscular junction
- Central fatigue originates at the central nervous system (CNS)
Muscle fatigue is a decline in performance, limiting athletic performance and strenuous activity
Muscle fatigue can occur in two basic mechanisms: central fatigue and peripheral fatigue. Central fatigue originates at the central nervous system (CNS), which decreases the neural drive to the muscle. It is caused by an inhibition elicited by nervous impulses from receptors in the fatigued muscles. Peripheral fatigue, on the other hand, is produced by changes at or distal to the neuromuscular junction. This may be due to the depletion of necessary substances and/or the accumulation of catabolites or other substances set free by muscle activity.
The development of muscle fatigue is typically quantified as a decline in the maximal force or power capacity of the muscle. This can be measured through force, power, and torque recordings. The mechanisms that cause fatigue are specific to the task being performed, and there is no global mechanism responsible for muscle fatigue. However, it is known that fatigue can be caused by many different mechanisms, such as the accumulation of metabolites within muscle fibres or the generation of an inadequate motor command in the motor cortex.
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It can be caused by the accumulation of metabolites within muscle fibres
Muscle fatigue can be caused by the accumulation of metabolites within muscle fibres. This is one of many physiological impairments that can cause muscle fatigue.
Metabolites are substances that are set free by muscle activity. When you exercise, substances such as inorganic phosphate (in ATP), protons, lactate, and free Mg2+ (an electrolyte) accumulate within muscle cells. This accumulation of substances causes a decline in performance, which is known as muscle fatigue.
Muscle fatigue is a commonly experienced phenomenon that limits athletic performance and other strenuous or prolonged activity. It is also increased and restricted in daily life under various pathological conditions, including neurological, muscular (e.g. MND) and cardiovascular disorders, as well as ageing and frailty.
The development of muscle fatigue is typically quantified as a decline in the maximal force or power capacity of the muscle. This means that submaximal contractions can be sustained after the onset of muscle fatigue.
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It can also be caused by the generation of an inadequate motor command in the motor cortex
Muscle fatigue can be caused by the generation of an inadequate motor command in the motor cortex. This is one of many physiological impairments that can cause muscle fatigue, which is a commonly experienced phenomenon that limits athletic performance and other strenuous or prolonged activity. It is also increased and restricted in daily life under various pathological conditions, including neurological, muscular (eg MND) and cardiovascular disorders, as well as ageing and frailty.
Muscle fatigue can be described as a feeling or sensation of weakness or muscle pain. Physiologists, however, have a more restricted meaning for muscle fatigue. For example, Edwards (1981) described muscle fatigue as a “failure to maintain the required or expected force”, and Vollestad (1997) described it as “any exercise-induced reduction in the capacity to generate force or power output”.
The development of muscle fatigue is typically quantified as a decline in the maximal force or power capacity of muscle, which means that submaximal contractions can be sustained after the onset of muscle fatigue. It can be caused by repeated, intense use of muscles, which leads to a decline in performance. When you experience fatigue, the force behind your muscles’ movements decrease, causing you to feel weaker. Physical exercise affects the biochemical equilibrium within the exercising muscle cells. For example, inorganic phosphate (in ATP), protons, lactate (see anaerobic capacity) and free Mg2+ (an electrolyte) accumulate within these cells.
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Peripheral fatigue is produced by changes at or distal to the neuromuscular junction
Peripheral fatigue is one of two basic mechanisms of muscle fatigue. The other is central fatigue, which originates in the central nervous system (CNS) and decreases the neural drive to the muscle. Central fatigue is caused by an inhibition elicited by nervous impulses from receptors in the fatigued muscles.
Muscle fatigue is a commonly experienced phenomenon that can be described as a feeling or sensation of weakness or muscle pain. It can also be defined as a failure to maintain the required or expected force. The development of muscle fatigue is typically quantified as a decline in the maximal force or power capacity of muscle.
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Central fatigue originates at the central nervous system (CNS)
Central fatigue is one of two basic mechanisms of muscle fatigue. The other is peripheral fatigue, which is produced by changes at or distal to the neuromuscular junction. Peripheral fatigue may be caused by the depletion of some necessary substance(s) and/or the accumulation of catabolites or other substances set free by the muscle activity.
Muscle fatigue can be described as a feeling or sensation of weakness or muscle pain. It is a commonly experienced phenomenon that limits athletic performance and other strenuous or prolonged activity. It is also increased and restricted under various pathological conditions, including neurological, muscular (e.g. MND) and cardiovascular disorders, as well as ageing and frailty.
The development of muscle fatigue is typically quantified as a decline in the maximal force or power capacity of muscle. It can arise from many points of the body and can be caused by the accumulation of metabolites within muscle fibres or the generation of an inadequate motor command in the motor cortex.
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Frequently asked questions
Muscle fatigue is a decline in performance, where the force behind your movements decreases, causing you to feel weaker.
Muscle fatigue can be caused by many different mechanisms, including the accumulation of metabolites within muscle fibres, the depletion of necessary substances, and inadequate motor commands in the motor cortex.
Muscle fatigue can affect the body in different ways, depending on the individual and the specific activity being performed. It can lead to a reduction in the capacity to generate force or power output, and it may also impact daily life, especially under pathological conditions such as neurological, muscular, or cardiovascular disorders.
Muscle fatigue is often characterised by a feeling of weakness or muscle pain. It can also be measured objectively through force, power, and torque recordings, as well as the ability to sustain submaximal contractions.
To prevent or manage muscle fatigue, it is important to understand the specific causes and how they relate to your activities. This may involve monitoring your exercise intensity, ensuring proper nutrition and hydration, and allowing for adequate rest and recovery between workouts.
