Metabolism is a amount of events which are carried out in the human being body to develop energy and also other substances necessary for that is activities. In our biology there are catabolic and anabolic processes.

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Catabolism is a procedure during which organic matter is broken down and also the energy is simultaneously released. It is defined by missing reserves the glycogen and mobilisation of non-saccharide resources of power – fats and also proteins. Catabolism takes place throughout increased movement activity and is necessary to sustain life functions.

Anabolism, on the other hand, is a energy-consuming process during i beg your pardon substances room created. The substrate it is provided exceeds the prompt need. The organism creates power reserves, tissues are created and also renewed. Anabolic procedures are widespread in situations of lessened physical activity.

The straightforward nutrients (carbohydrates, lipids, proteins) are existing in food us eat. Those are transformed and took in through the cradle system. Carbohydrates failure into separation, personal, instance carbohydrates (monosaccharides) whereby the glucose ranks among the most necessary ones. Lipids break down into totally free fatty acids and glycerol. Proteins malfunction into amino acids. These an easy agents have the right to then become connected in more complex processes.

Carbohydrates are supplied in both anaerobic and aerobic activities. ATP resynthesizes indigenous glycogen (muscle glycogen, liver glycogen) which transforms into glucose. Provides of glycogen in the human body are restricted. Lipids are supplied in endurance-based movement task of short intensity. If the use of proteins in the ATP resynthesis is an extremely limited, complimentary fatty mountain are offered to a big extent. Glucose is produced through gluconeogenesis.

Muscle metabolism

Muscles need energy to produce contractions (Fig. 6). The power is obtained from adenosine triphosphate (ATP) existing in muscles. Muscles have tendency to save on computer only minimal quantities that ATP. When depleted, ATP demands to be resynthesized from various other sources, specific creatine phosphate (CP) and muscle glycogen. Various other supplies that glycogen are stored in the liver and also the human being body is likewise able come resynthesize ATP from lipids, i.e. Complimentary fatty acids. Different modes of energy coverage space used depending upon intensity and duration the the workload placed on the organism.

Figure 6 power for muscles

The ATP-CP system

The above mentioned ATP and also CP room the energy sources the muscle contraction (Fig. 7, 8, 9). The manufacturing of power used in muscle contraction takes place through the anaerobic way (without oxygen).

Figure 7 ATP molecule


Figure 8 ATPase (ATP breakdown and power production because that muscle contraction)


Figure 9 ATP resynthesis native CP

Anaerobic glycolysis

It is a chemical procedure during i m sorry ATP gets renewed indigenous glycogen, i.e. Glucose in one anaerobic way (without access to oxygen). In these processes lactate, i.e. Salt the the lactic acid is generated in muscles. This power system produce 2 molecules of ATP. Glycolysis - change of glucose right into 2 molecules of the pyruvate generating the network yield indigenous ATP molecules and also 2 NADH molecules (anaerobic break down of glucose right into pyruvate and lactate) – see. Fig. 10.

Oxydative system

This is a chemical procedure during which the ATP resynthesis takes location through one aerobic way (with accessibility to oxygen). Both glycogen or glucose and totally free fatty mountain act right here as sources of energy.

Aerobic glycolysis takes location in the cytoplasm the the cell where 34 ATP molecules are generated from the glycogen, i.e. Glucose with oxygen present (Fig. 10).

Figure 10 Anaerobic and also aerobic glycolysis


Free fatty acids current in mitochondria that muscle fibres transformed into acetyl CoA are provided in the ATP resynthesis. Acetyl CoA enters the Krebs cycle and also thus ATP molecules space generated.

Individual energy systems get associated according come the soot of a movement task carried out. If the performance is performed at the maximum level, over there is a progressive involvement of every the equipment (Fig. 11, 12).

Figure 11 power coverage under preferably workload


Figure 12 energy coverage under preferably workload


Types of muscle fibres

Human muscle fibres have distinct qualities. Return nowadays nearly 30 types of muscle fibres are known to be existing in the human body, we have tendency to work only with the adhering to three types:

Slow red muscle fibre ns (SO - slow oxidative fibres)

The sluggish red muscle fibre is typified through a high aerobic capacity and also resistance to fatigue. Together their anaerobic capacity is slow, they room not able to show an excellent muscle strength. Muscle contraction often tends to be slow – 110 ms/muscle contraction. One motoric unit contains around 10-180 muscle fibres.

Fast red muscle fibre IIa (FOG – rapid oxidative glycolytic fibres)

The rapid red muscle fibre shares part of features with a sluggish fibre or a fibre of IIx type. This fibre is typified by tool aerobic capacity and resistance to fatigue. It also shows high anaerobic capacity and also is able to display good muscle strength. The speed of contraction is 50 ms/muscle contraction. One motoric unit contains around 300-800 fibres.

Fast white fibre IIx (FG – quick glycolytic fibre)

Unlike the previously mentioned varieties the quick white fibre is identified by short aerobic volume and propensity to quick fatigue. ~ above the other hand, it has the greatest anaerobic capacity and also is able to display significant muscle strength. The speed of contraction is 50 ms/muscle contraction. One motor unit contains about 300-800 fibres.

The volume that this kind muscle fibres is genetically offered (up come 90 %) (Jančík et al., 2007) and also varies in individual persons. In the average populace the ratio of sluggish to rapid fibres is 1:1. The following number (Fig. 13) reflects the proportion of slow-moving to quick fibres in athletes engaged in different disciplines.

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Figure 13 ratio of quick (type FG and FOG) to slow-moving (type SO) fibres in different type athletes


In muscle convulsion individual types of muscle fibres acquire activated in accordance v the soot of muscle movement. Throughout low intensity exercise slow fibres are mostly recruited. However, with enhancing intensity the exercise quick fibres gain activated. It is essential to note right here that the fibre proportion differs in different muscles of the human body. For example, postural muscles often tend to contain much more slow fibres.