Creatine supplementation can increase performance by following way.
- Help performance by increasing resting PCr stores
- Increases the rate of PCr re-synthesis between bouts of exercise more PCr will be available to re-synthesis ATP.
- Increases Total Cr can increase the buffering ability within the cell.
- Increased PCr stores should assist in maintaining levels of ATP and
- Improve performance in short term high intensity exercise
- With Increased PCr concentration, high power outputs can be maintained longer which will in turn increase performance.
- Delay muscular fatigue
Many sports consist of repeated bouts of high intensity exercise with varying amounts of recovery time. In these type of activities most of the energy is derived from anaerobic pathways which makes quick recovery very important. The rate of PCr resynthesis will influence energy availability for the next bout of exercise. Phosphocreatine degradation is the major source of ATP utilization during repeated bouts of high intensity exercise. Therefore increased re-synthesis of PCr back to, or near resting levels could greatly increase performance in repeated exercise bouts.
Possible Health Benefits
Power is result of force of muscle contraction which is energy dependent. Creatine plays vital role in energy release thus helps to increase force of contraction so more power.
- Creatine is an example of a physiologically important nitrogenous compound synthesized from amino acids.
- Muscular contraction results in an accumulation of Cr because creatine plays an important role in the transfer of energy.
- Creatine depends on various dietary factors and body can conserve the dietary essential amino acids, arginine and methionine, during times of dietary insufficiency or stress.
- Growth hormone and thyroid hormone deficiency decrease AGAT (Enzyme that plays chief role in creatine synthesis) activity, thus decreases creatine synthesis.
- Limitations in Cr synthesis might exist during conditions of folic acid and/or vitamin B 12 deficiencies
- Testosterone stimulates AGAT expression and thus, Cr biosynthesis.
- The rate of Cr biosynthesis is on the order of 1-2 g/d.
How creatine helps in exercise and recovery
Exercise results in high demand of ATP which rapidly depleted and gives ADP and give required energy to muscle contraction
Exercise: ATP —(ATPase)—> ADP + Pi
High energy demand leads to depletion of ATP in muscle cell and creatine comes in metabolism to give energy for muscle contraction thus creatine depletes from cells
Exercise: PCr + ADP + H + —(CK)—>Cr + ATP
Creatine, in the form of PCr, is essential for replenishing ATP stores that are used immediately during high-intensity exercise & PCr is depleted very quickly. During recovery period if creatine is available in diet, faster creatine replenishment ensure faster recovery.
Recovery: PCr + ADP + H + <—(CK)—Cr + ATP
Studies have shown that prior creatine loading enhances glycogen storage and carbohydrate loading in a trained muscle, new research has shown that creatine can help buffer lactic acid that builds-up in the muscles during exercise and helps in faster recovery
- Improving the status of skeletal muscle-PCr stores through Cr ingestion can help delay PCr depletion and rapidly refresh stores of ATP to prevent the occurrence of fatigue during short-term muscular effort
- Reduces dependence on anaerobic glycolysis for energy production and reduces lactic acid formation.
- Helps muscle relaxation and recovery during repeated bouts of intense, short duration effort through increased rate of ATP and PCr resynthesis, thus allowing for continued high power outputs
- From the liver, Cr can be exported and transported throughout the bloodstream and taken up by Cr-requiring tissues, such as skeletal muscle, heart, and brain
- Dietary Cr has a very high bioavailability, passing through the digestive tract intact for transport directly into the bloodstream.
- Normal plasma levels of Cr are about 50 mmol/L, and increase sharply after supplementation with Cr or ingestion of meat.
- Research with food and supplement sources of Cr has shown that consuming 2 g of Cr in solution resulted in a peak plasma concentration of nearly 400 mmol/L at 30-60 min.
- Once absorbed into the bloodstream, Cr (from both endogenous and dietary sources) is either cleared by the kidneys or taken up at the tissue level, primarily skeletal muscle, to be used.
- With respect to dietary Cr. not all of the ingested Cr can be retained in the body once absorbed, especially when high doses of supplements are taken. A high proportion of Cr is usually retained in the initial days of Cr supplementation, but urinary Cr excretion progressively increases with continued ingestion.
- An explanation for the decrease in Cr retention with high-dose supplementation may be owing to the observation that, Cr supplementation can result in down regulation of the Cr transporter (CreaT) isoform expression in skeletal muscle. In other words, there are less Creatine receptors in muscle after supplementing with Cr. This effect on CreaT receptors is probably one reason why there appears to be a limit or maximal amount of Cr that can be stored
- Creatine accumulation might be increased slightly by ingesting insulin stimulating nutrients such as carbohydrate. Cr supplementation combined with 1 g glucose/kg body mass twice per day increased muscle total-Cr by 9% more than Cr supplementation alone.
- Creatine uptake has been shown to be stimulated following sub maximal exercise bouts.
- This increase in Cr uptake following exercise has been demonstrated to only occur in skeletal muscles involved in the exercise.
- Enhances the performance
- Increase lean body mass, strength, and total work
- Increase anaerobic work capacity
- Helps in protein synthesis for greater muscles gain
- Remove lactic acid from muscles after intense workout.
- Improves cognition and brain function
- Increase bone density
- Enhances glycogen storage and carbohydrate loading
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