Dear Friend and Fellow Athlete,
T3 (cytomel) (Liothyronine sodium)
Cytomel is the most common synthetic version of the T3 or triiodothyronine. T3 is not produced directly by the thyroid gland but by the thyroid-stimulating hormone or THS. THS is also responsible for the production of T4 or thyroxine.
Drugs with thyroid hormone activity, such as Cytomel, are used for the treatment of obesity since they are effective fat-burning agents.
Cytomel exerts its fat-burning ability via the following metabolic pathways and processes.
Cytomel up-regulates the beta-2 adrenergic receptors in fat tissues. In lipolysis, or the breakdown of fat in fat tissues, the enzyme HSL (hormone sensitive lipase) plays a significant part. HSL controls the rate of lipolysis. For HSL to be activated, epinephrine and nonepinephrine (catecholomines) are necessary. These catecholomines bind to the beta-2 receptors, and thus when Cytomel up-regulates the beta-receptors, there is a corresponding increase in the ability of catecholomines to activate HSL, resulting to increased lipolysis.
This drug is likewise known to increase the UCP-3 or uncoupling protein-3. This process significantly increases lipolysis. Further, Cytomel also stimulates growth hormone (GH) production, as substantiated by several studies. And since GH is a thermogenic, it contributes to this drug’s fat-burning action. This is why when athletes are using Cytomel they find no need to use HGH.
Advantages of Cytomel therapy
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With AAS use, the suppression occurs even after the therapy is stopped, sometimes in periods of weeks or months (especially in cases of long-term use). The same thing is observed during insulin intake, whereby the pancreas (the organ responsible for insulin production) ceases its production of insulin. Such is not the case with exogenous T3 hormone therapy. Several studies have concluded that thyroid therapy does not cause prolonged suppression of thyroid normal production. Thyroid function is normalized just days after medication is discontinued. In other words, there is no thyroid shutdown due to T3 supplementation; there is only a down-regulation of thyroid output during therapy.
Drawbacks of Cytomel therapy
Side effects of this class of drug include tachycardia and atrial arryhtmias, bone resorption, and loss of lean muscle tissue. Secondary side effects include insomnia, diarrhea, and nausea. These adverse reactions are highly possible if the user takes high dosages.
Notice that some of its major side effects relate to the cardiovascular system. This is because thyroid hormones have significant effects on cardiac structures (including cardiac muscles) and systems that alter cardiovascular hemodynamics.
Hyperthyroidism increases virtually all cardiac functions including heart rate and contractility, diastolic relaxation, and rate of ventricular pressure development. This results to an increased cardiac output by as much as 250 percent. These physiological changes are (most likely) the consequences of an increase in the expression of ATP and a decrease in the expression of ATP’s inhibitor, phospholamban.
Another drawback of Cytomel is its catabolic ability. When Cytomel exerts this ability on stored fats, this is an asset. However, this becomes a liability when it exerts this on bones and muscles. The negative result is bone resorption and muscle wasting (mentioned above). Moreover, this drug also diminishes GH’s nitrogen retention ability (although it stimulates GH’s production, as mentioned earlier).
There is consensus among Cytomel users that the dosage protocol with this drug is to ramp it up, which means you start at the lowest dosage then gradually move upward. However, there are divergent opinions on how long the ‘gradually’ part should be. There are those who say it should be every three days, and then some pharmacological studies endorse it from 1 to 2 weeks. However, the user’s tolerance level ultimately determines the timeframe; that is, if the user reacts really well with Cytomel, then the dosage can gradually increase every three days.
Users are advised not to ramp up and down the dosage during therapy as this causes fluctuations in hormone levels, which further results to hormonal imbalance. The more prudent practice is to taper off the dosage. The minimum daily dosage of T3 is 5mcg and the maximum is 100mcg.
Cytomel intake is not dependent on bodyweight or gender, but rather on the individual’s blood level. This means that females can take the same dosage volume and schedule as males.
Discuss Cytomel on the EliteFitness.com Forums
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