gh reducing the ability to form glycogen and metabolize glucose is basic metabolic information. it inhibits glucose uptake and negatively impacts glycogen synthesis capability in mmuscle.
as for effects on fiber type=
In addition to the potentially detrimental derangements in glucose metabolism mentioned above, GH administration in humans has been shown to induce a shift in muscle fiber type from type 2a to 2x (9, 10). The latter has been characterized as the “default” fiber type since the proportion of 2x fibers to type1 and type 2a is relatively high in “couch potatoes” compared to strength and power athletes. Resistance training induces a shift in the opposite direction from type 2x to 2a. During detraining, the muscle fiber type shifts back to 2x. The training induced shift is interpreted as an adaptive mechanism to the increased demands placed upon the muscle. If GH administration induces a shift in muscle fiber type away from the trained state, this could have negative implications for strength and power athletes.
(9) Hennessey JV, Chromiak JA, DellaVentura S, Reinert SE, Puhl J, Kiel DP, Rosen CJ, Vandenburgh H, MacLean DB. Growth hormone administration and exercise effects on muscle fiber type and diameter in moderately frail older people. J Am Geriatr Soc. 2001 Jul;49(7):852-8.
(10) Lange KH, Andersen JL, Beyer N, Isaksson F, Larsson B, Rasmussen MH, Juul A, Bulow J, Kjaer M. GH administration changes myosin heavy chain isoforms in skeletal muscle but does not augment muscle strength or hypertrophy, either alone or combined with resistance exercise training in healthy elderly men. J Clin Endocrinol Metab. 2002 Feb;87(2):513-23
as for effects on body compositiuon and strength=
Deyssig et al (5) conducted a similar study in trained power athletes. One group was given rhGH at 0.09 U/kgBW day while another was given placebo. Both groups participated in a resistance training program for six weeks. At the end of the study period changes in strength and body composition were measured in both groups. Again there was no difference between the two groups in the parameters measured. The authors concluded that GH treatment had no effect on strength or body composition in highly trained strength athletes.
(5) Deyssig R, Frisch H, Blum WF, Waldhor T. Effect of growth hormone treatment on hormonal parameters, body composition and strength in athletes. Acta Endocrinol (Copenh). 1993 Apr;128(4):313-8.
to conclude=
The results of studies of muscle protein synthesis, body composition, and strength in healthy young to middle aged humans tell a different tale: so far no robust, credible study has been able to show clear effects of either medium to long term rhGH administration, alone or in combination with a variety of training protocols or anabolic steroids, on muscle protein synthesis, mass or strength.
(7) Rennie MJ.Claims for the anabolic effects of growth hormone: a case of the emperor's new clothes? Br J Sports Med. 2003 Apr;37(2):100-5.
all of this taken directly out of karl hoffman ("nandi" on the forums) article "recombinant growth hormone and the athlete"... which can be found here
http://www.mindandmuscle.net/articles/karl_hoffman/growth_hormone_athlete
