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The effects of growth hormone (GH) deficiency and GH replacement on cognitive performance in adults: a meta-analysis of the current literature *

OBJECTIVE: There is growing evidence in the neuropsychological literature that growth hormone (GH) deficiency is associated with cognitive impairment. There is also evidence that this impairment may be ameliorated with GH replacement therapy. The current study assessed the nature and severity of cognitive impairment associated with growth hormone deficiency, as well as effect of GH replacement on cognitive function by conducting a meta-analysis of the published literature to date.

METHOD: Thirteen studies met the inclusion criteria and these included: five cross-sectional studies investigating GH deficiency; and, eight (eight prospective, two of which also included cross-sectional comparisons) investigating GH replacement. Effect sizes (Cohen's d) falling into six cognitive domains were computed (separately for GH deficiency and GH replacement). RESULTS: For GH deficiency, each of the cognitive domains assessed (besides language) showed moderate to large impairments when compared to matched controls (Effect sizes -0.46 to -1.46). For GH replacement, even though treated patients still performed moderately to largely below that of controls, when compared to their own baselines (as in prospective analyses), moderate improvements were found in cognitive performance, particularly attention and memory.

CONCLUSION: This meta-analysis clearly demonstrates the link between GH and cognitive performance, where poor performance can be ameliorated with GH treatment.

* Legal Disclaimer: Chelation and Hyperbaric Therapy, Stem Cell Therapy, and other treatments and modalities mentioned or referred to in this web site are medical techniques that may or may not be considered “mainstream”. As with any medical treatment, results will vary among individuals, and there is no implication or guarantee that you will heal or achieve the same outcome as patients herein.

As with any procedure, there could be pain or other substantial risks involved. These concerns should be discussed with your health care provider prior to any treatment so that you have proper informed consent and understand that there are no guarantees to healing.

THE INFORMATION IN THIS WEBSITE IS OFFERED FOR GENERAL EDUCATIONAL PURPOSES ONLY AND DOES NOT IMPLY OR GIVE MEDICAL ADVICE. No Doctor/Patient relationship shall be deemed to have arisen simply by reading the information contained on these pages, and you should consult with your personal physician/care giver regarding your medical treatment before undergoing any sort of treatment or therapy.

Published on 06-11-2007