Nandrolone Decanoate (Deca Durabolin)
Nandrolone Decanoate is one of the most widely used anabolic steroids. Structurally nandrolone decanoate is very similar to testosterone, although it lacks a carbon atom at the 19t” position (hence its other name 19-nortestosterone). The resulting structure is a steroid that exhibits much weaker androgenic properties than testosterone. This steroid is an extremely long acting compound, with the decanoate ester the release time of up to three or four weeks.
This anabolic androgenic steroid has gained huge acceptability among professional bodybuilders and athletes, Deca Durabolin or Nandrolone Decanoate is undoubtedly the second-best known injectable steroid after Testosterone. Nandrolone decanoate injection is intended for deep intramuscular injection only, into the gluteal muscle preferably.
The use of androgenic-anabolic steroids (AAS) among bodybuilders to increase muscle mass is widespread. Nandrolone decanoate (ND) is one of the most popular misused AAS, although the effects on body composition are equivocal. Therefore, the purpose of this study was to determine the effect of ND on body composition in male bodybuilders, with special reference to muscle mass alterations.
Using a randomized “double-blind” “placebo-controlled” design, 16 experienced male bodybuilders (age: 19-44 yr) either received ND (200 mg.wk(-1), intramuscularly) or placebo for 8 wk. Body composition was assessed using the four-component model, combining results from underwater weighing, dual-energy x-ray absorptiometry (DXA), and deuterium dilution. Total bone mineral content and density were measured using DXA. Water compartments (extracellular water [ECW] and intracellular water [ICW]) were determined using deuterium dilution and bromide dilution.
ND administration resulted in significant increments of body mass (+2.2 kg), fat-free mass (FFM: +2.6 kg), and total body water (+1.4 kg). No significant changes in fat mass, percentage fat, ECW, ICW, ECW/ICW ratio, hydration of the FFM, and on bone mineral measurements were observed.
The results show that the administration of 200 mg.wk(-1) of ND (intramuscularly) for 8 wk significantly increased body mass and FFM, whereas fat mass, bone mineral content, bone mineral density, and the hydration of the FFM remained unaffected. These data indicate that the changes can be attributed to an increase of muscle mass.
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