Key result
Growth hormone administration did not impair insulin-stimulated myocardial glucose uptake compared to control (0.34 vs 0.31 micromol/g/min; P=0.18) despite decreasing whole body glucose disposal.
Why the study?
Does growth hormone administration reduce insulin-stimulated myocardial glucose uptake in healthy males?
Does growth hormone administration reduce insulin-stimulated myocardial glucose uptake in healthy males?
Growth hormone induces whole-body insulin resistance but does not impair insulin-stimulated myocardial glucose uptake in healthy males, suggesting myocardial insulin resistance is not an inherent consequence of whole-body insulin resistance.
Does not support cardiac glucose uptake concerns with short-term GH in healthy males; leaves open effects in disease or chronic use.
Cardiac muscle is characterized by insulin resistance in specific heart diseases such as coronary artery disease and congestive heart failure, but not in generalized disorders like diabetes mellitus and essential hypertension when cardiac manifestations are absent. To examine whether the insulin antagonistic effect of growth hormone (GH) acts upon the heart, we compared insulin-stimulated whole body and myocardial glucose uptake with and without GH administration during a 3.5-h euglycemic-hyperinsulinemic clamp in eight healthy males. Myocardial 2-deoxy-2-[(18)F]fluoro-D-glucose uptake was measured with positron emission tomography. The data were converted to myocardial glucose uptake by tracer kinetic analysis. GH did not change the rate-pressure product. GH decreased whole body insulin-stimulated glucose disposal by 26% (48.0 +/- 12.1 vs. control 62.8 +/- 6.1 micromol. kg(-1). min(-1), P < 0.02). Free fatty acids were suppressed to a similar extent with and without GH during the insulin clamp. Insulin-stimulated myocardial glucose uptake was similar in the presence and in the absence of GH (0.34 +/- 0.05 and 0.31 +/- 0.03 micromol. g(-1). min(-1), P = 0.18). In conclusion, GH does not impair insulin-stimulated myocardial glucose uptake despite a considerable whole body insulin antagonistic effect. Myocardial insulin resistance is not an inherent consequence of whole body insulin resistance.
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Bøtker et al. (2000) studied Healthy (n=8). Growth hormone (GH) vs. Without GH administration was evaluated on Insulin-stimulated myocardial glucose uptake (p=0.18). Growth hormone administration did not impair insulin-stimulated myocardial glucose uptake compared to control (0.34 vs 0.31 micromol/g/min; P=0.18) despite decreasing whole body glucose disposal.
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