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Muscle adaptation is a well-studied phenomenon, with endurance training and strength training being the two most common types. However, it is uncommon to find an activity that relies purely on endurance or purely on strength. Most activities combine the two, and this type of training has been termed concurrent exercise. For example, endurance training leads to adaptations in the cardiovascular and musculoskeletal systems, increasing exercise capacity and performance. In contrast, strength training leads to muscle adaptations such as increased myofibrillar protein synthesis, resulting in increased muscle size, strength, and power. The rate and degree of muscle adaptation depend on various factors, including training intensity, volume, frequency, and initial fitness level.
| Characteristics | Values |
|---|---|
| Type of exercise | Endurance training or strength training |
| Endurance training | High repetition, low load contractions |
| Strength training | Low repetitions, high load contractions |
| Muscle adaptations | Increased myofibrillar protein synthesis |
| Neuromuscular adaptations | Neural adaptations, muscular adaptations |
| Training type | Concurrent training, combining endurance and strength |
| Training intensity | High-intensity training, low-intensity training |
| Training volume | Greater volume needed to increase mitochondrial mass |
| Training frequency | --- |
| Initial fitness level | Sedentary people with no training experience have the greatest adaptation potential |
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What You'll Learn
Endurance training increases the body's ability to transport and use oxygen
Endurance training involves performing exercises with a low load over a long duration, during which the muscles undergo repeated contractions. This type of training stimulates specific adaptations in the neuromuscular, cardiovascular, and respiratory systems, enhancing the body's ability to transport and utilize oxygen more efficiently.
The body's ability to transport oxygen begins with the lungs, which take in oxygen from the air and perfuse it into the bloodstream. Endurance training improves the ventilatory mechanics, leading to enhanced oxygen uptake and a more efficient exchange of gases. The heart and blood vessels then transport this oxygen-rich blood to the working muscles. Training increases the efficiency of oxygen transport within the body, ensuring that the muscles receive an adequate supply of oxygen to support their activity.
At the muscular level, endurance training induces local adaptations in skeletal muscle fibers, specifically the Type I slow-twitch muscle fibers. This includes an increase in capillary density, with the growth of new capillaries through a process called angiogenesis. This enhanced capillary network facilitates the diffusive exchange of gases, allowing for a greater supply of oxygen to the muscles and the removal of metabolic waste products like carbon dioxide and lactic acid. Additionally, endurance training increases mitochondrial biogenesis, boosting the capacity for energy production through the generation of adenosine triphosphate (ATP) and improving the muscle's ability to utilize oxygen for aerobic respiration.
The combined effect of these adaptations is a delay in the onset of muscle fatigue during prolonged aerobic performance. The improved oxygen transport and utilization enable the muscles to maintain their energy production and delay the accumulation of fatigue-inducing metabolites. As a result, individuals can perform at higher intensities or sustain activity for longer durations, ultimately enhancing their overall exercise capacity and performance.
Furthermore, endurance training also leads to adaptations in substrate utilization. There is an increased contribution of fatty acid oxidation to meet the energy requirements during submaximal exercise, with muscles utilizing intramuscular triglycerides as the primary fuel source. This shift in substrate utilization allows for a more efficient use of energy sources and contributes to the improved endurance capacity of the individual.
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Resistance training increases muscle protein synthesis
Muscle protein synthesis (MPS) is the metabolic process that describes the incorporation of amino acids into bound skeletal muscle proteins. The synthesis of myofibrillar proteins is primarily responsible for changes in skeletal muscle mass following resistance training.
The overarching concept is that initial increases in MPS are a biological response to support the remodelling of damaged muscle protein and eventually muscle hypertrophy. The synthesis of myofibrillar proteins is primarily responsible for changes in skeletal muscle mass following resistance training. This is in contrast to mitochondrial proteins, which are primarily synthesized in response to endurance-type training.
The rate of MPS is stimulated further by protein ingestion after resistance exercise. This combination results in the accretion of skeletal muscle protein, referred to as hypertrophy. By changing the nature of the exercise stimulus, it is possible to redirect the focus of the type of skeletal muscle proteins that are being synthesized during the recovery period. For example, endurance exercise training results in an increase in the expression of mitochondrial genes and proteins, leading to a shift toward an oxidative phenotype and improved fatigue resistance.
High-intensity interval exercise (HIIE) has been shown to increase myofibrillar MPS, although not to the same degree as resistance exercise. HIIE was also the only exercise modality to stimulate an increase in sarcoplasmic MPS, which was attributed to increased mitochondrial protein synthesis.
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Neural adaptations improve muscle coordination
Neural adaptations are an important aspect of strength training, influencing the brain's ability to coordinate muscle movements effectively. This process involves the brain recruiting the necessary muscles to contract and produce a desired movement. For instance, when performing a complex exercise such as a deep squat, the athlete's brain must coordinate the contraction of multiple muscle groups, including the hamstrings, hips, glutes, quads, and core.
During strength training, the brain undergoes neural adaptations to improve its ability to send signals to the muscles. These signals are transmitted along motor pathways, instructing the muscles on when, how quickly, and with how much power to contract. As a result, athletes can develop muscle memory, allowing them to execute movements with greater ease and efficiency. The more an athlete practices a particular exercise, the more ingrained the movement becomes, eventually becoming semi-automatic. This is achieved through the growth of motor neurons and muscle fibres, which ultimately leads to increased muscle mass.
The neural adaptations that occur during strength training can be further understood through the concept of muscle memory, also known as neuromuscular facilitation. Muscle memory is the process by which muscles become familiar with specific motor skills. As signals are repeatedly sent from the brain to the muscles, pathways are established, making the execution of these movements more automatic. This is particularly beneficial for athletes, as it allows them to access their movement patterns quickly during performances.
The type of exercise performed also plays a crucial role in neural adaptations. Endurance training, for example, focuses on increasing muscle fatigue resistance for longer durations. This type of training enhances the oxidative capacity and metabolic efficiency of skeletal muscle. On the other hand, strength training involves high load contractions that stimulate muscle adaptations such as increased muscle size, strength, and power. By understanding these differences, coaches can design strength training programs that incorporate sufficient resistance, velocity, and complexity to maximize performance and improve muscle coordination.
In conclusion, neural adaptations play a crucial role in improving muscle coordination during strength training. Through the development of motor neuron pathways and muscle memory, athletes can enhance their brain-body coordination, allowing for more efficient and powerful movements. By understanding these neural adaptations, athletes and coaches can design training programs that maximize performance and improve overall coordination.
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Mitochondrial adaptations enhance endurance
Endurance training focuses on increasing muscle fatigue resistance to enable the body to perform exercise for a longer duration. This type of training enhances the oxidative capacity and metabolic efficiency of skeletal muscle. Mitochondria, often referred to as the "powerhouses of our cells", are the primary drivers of bioenergetic reactions that fuel physical exertion. They are essential organelles located in the intracellular space of most functional cells.
Mitochondrial adaptations to endurance training vary across different fibre types, depending on the initial organelle content and the degree of motor unit recruitment during the training session. With endurance training, the mitochondrial content within any of these fibre types can be enhanced, indicating that mitochondrial adaptations are based on the stimulus and the recruitment of that fibre. For example, Type I fibres are most easily recruited at exercise intensities as low as 40% or lower. As the workload increases and exceeds 40%, Type IIa fibres are recruited, and Type IIx fibres are only engaged when the exercise intensity surpasses about 75%.
Endurance training increases the rate of mitochondrial biogenesis, which is the growth and assembly of mitochondria, leading to a greater capacity for aerobic ATP provision in skeletal muscle. This increase in mitochondrial volume, typically ranging from 40% to 50%, is accompanied by modest improvements in respiration and oxidative capacity per organelle. High-intensity training is particularly effective in increasing mitochondrial activity, while a greater training volume is required to increase mitochondrial mass.
In addition to mitochondrial adaptations, endurance training also results in local adaptations in skeletal muscle, such as increased capillary density, which aid in the body's ability to transport and utilise oxygen for energy production. This, in turn, delays the onset of muscle fatigue during prolonged aerobic performance.
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Cardiovascular adaptations increase exercise capacity
Exercise can be broadly categorized into aerobic/endurance and power/strength activities. Pure endurance and pure strength exercises are rare, as most activities combine both. However, endurance training leads to adaptations in the cardiovascular and musculoskeletal systems, resulting in an overall increase in exercise capacity and performance.
Endurance training enhances the oxidative capacity and metabolic efficiency of skeletal muscles. The adaptations achieved include oxygen utilization (mitochondrial adaptations), oxygen delivery (angiogenesis), and local substrate availability. Mitochondria are the primary organelles for energy production, and endurance training increases their density and capacity, leading to improved oxidative capacity.
Cardiovascular adaptations are essential for increasing exercise capacity. Aerobic exercise training leads to cardiovascular changes that increase aerobic power and improve endurance performance. The most important adaptation is the improvement in maximal cardiac output, achieved through an enlargement in cardiac dimension, improved contractility, and an increase in blood volume. This allows for greater filling of the ventricles and a larger stroke volume. The diameters of larger arteries increase, reducing resistance to flow, while the wall thickness decreases, contributing to increased arterial compliance. Additionally, endurance training may induce alterations in vasodilator capacity, particularly in individuals with reduced vascular function.
The microvascular network increases in size within the muscle, improving the capacity for oxygen extraction by providing a greater area for diffusion, a shorter diffusion distance, and a longer mean transit time for erythrocytes. These adaptations ensure that the cardiovascular system can meet the increased metabolic needs of the body during endurance exercises, thereby increasing overall exercise capacity.
In summary, endurance training leads to cardiovascular adaptations that increase aerobic power, enhance oxygen delivery, and improve endurance performance. These adaptations support an overall increase in exercise capacity by optimizing the interaction between the cardiovascular and musculoskeletal systems.
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Frequently asked questions
Muscle adaptation is the process by which the body alters its physiology in response to exercise, leading to improved performance and increased capacity.
Endurance training increases the body's ability to perform aerobic endurance activities by improving its ability to utilise oxygen for energy production and delaying muscle fatigue. This is achieved through increased mitochondrial biogenesis, capillary density (angiogenesis), and enhanced oxidative capacity.
Strength training leads to structural and functional changes in the body, resulting in increased muscle size, strength, and power. It also increases myofibrillar protein synthesis and causes neural adaptations, such as improved intermuscular coordination and motor unit recruitment.
Yes, the type of exercise performed influences the specific muscle adaptations that occur. Endurance training focuses on enhancing fatigue resistance, while strength training aims to increase muscle strength and size. However, most activities involve a combination of endurance and strength elements, leading to a range of muscle adaptations.
The majority of muscle adaptations are common and well-documented, such as increased endurance or strength. However, the specific adaptations can vary based on individual factors like training intensity, volume, frequency, and initial fitness level. Uncommon adaptations may occur in response to unique training programmes or specific physiological characteristics.
