Acute hyperglycemia can decrease endogenous GH secretion, that has nothing to do with the GH that you inject..
There's nothing wrong with morning/daytime GH injections, the food you eat will not make the GH you inject ineffective...
As for the insulin+GH combo, there is some evidence that insulin can upregulate GH receptors...
Many vets have made great gains on that stack.
Here's a study which shows that insulin + GH is superior than either of them alone...
Growth hormone and insulin combine to improve whole-body and skeletal muscle protein kinetics.
Wolf RF, Heslin MJ, Newman E, Pearlstone DB, Gonenne A, Brennan MF.
Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.
BACKGROUND. A cooperative effect of exogenous insulin and recombinant human growth hormone (r-hGH) with respect to whole-body and skeletal muscle protein metabolism has not been demonstrated previously. This study examined the effect of r-hGH and insulin administration during euglycemic clamping and concurrent amino acid supplementation. METHODS. Twenty-three normal volunteers in the postabsorptive state were either treated with r-hGH for 3 consecutive days before a metabolic study (GH group; n = 10) or not treated (CTRL group; n = 13). The r-hGH dose was 0.2 mg/kg/day (n = 5) or 0.1 mg/kg/day (n = 5). All subjects then received an infusion of 14C-labeled leucine and tritiated phenylalanine, followed by measurement of baseline protein kinetics (GH and CTRL). Subsequently a euglycemic insulin infusion (1 mU/kg/min) with concurrent amino acid infusion was administered, and protein kinetic measurements were repeated at steady state. RESULTS. GH and insulin separately produced an increase in whole-body and skeletal muscle protein net balance. GH plus insulin was associated with a higher net balance of protein than was insulin alone. CONCLUSIONS. r-hGH and insulin in the presence of amino acids and glucose combine to improve whole-body and skeletal muscle protein kinetics.
Timing of GH administration may not be relevant in GH deficient subjects:
Horm Res 1993;39(5-6):188-91 Related Articles, Links
Effect of timing of growth hormone administration on plasma growth-hormone-binding activity, insulin-like growth factor-I and growth in children with a subnormal spontaneous secretion of growth hormone.
Zadik Z, Lieberman E, Altman Y, Chen M, Limoni Y, Landau H.
Pediatric Endocrine Unit, Kaplan Hospital, Rehovot, Israel.
Since normal pulsatile growth-hormone (GH) secretion displays a major and consistent surge during sleep, we studied the effect of timing of GH supplementation on plasma GH-binding protein activity (GH-BP), insulin-like growth factor-I (IGF-I) and growth. 34 prepubertal subjects (28 boys, 6 girls) aged 8-11 years, of short stature (< 2 SD for age), with a GH response to provocative test > 10 micrograms/l and a subnormal 24-hour GH secretion (< 3 micrograms/l), were randomly allocated to receive Bio-Tropin (recombinant GH, Bio-Technology, Israel) 0.81 IU/kg/week in 3 equally divided doses. GH was administered either at 8.00-10.00 h (M group), 14.00-16.00 h (AN group) or 19.00-21.00 h (NT group). Height velocity, IGF-I and GH-BP were determined prior to and after 6 and 12 months on GH therapy in the three groups. There was no significant difference between the three groups in the growth response, IGF-I and GH-BP increase, all of which increased significantly during GH therapy. Although GH levels after the injection decline to preinjection levels after 10 h, the changes induced by GH therapy, as reflected in IGF-I and GH-BP, last in the circulation long enough to prevent fluctuations in its action. The similarity of IGF-I and of GH-BP levels in the three treatment groups might explain the similar growth effects of the 3 protocols.