Serum Insulin-Like Growth Factor-I and Pro-Collagen Type III N-Terminal Peptide in Adolescent Elite Athletes: Implications for the Detection of Growth Hormone Abuse in Sport

Context: A method based on two GH-dependent markers, IGF-I and pro-collagen type III N-terminal peptide (P-III-P), has been devised to detect exogenously administered GH. Because previous studies on the detection of GH abuse involved predominantly adult athletes, the method must be validated in adol...

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Published in:	The journal of clinical endocrinology and metabolism Vol. 95; no. 6; pp. 2969 - 2976
Main Authors:	Guha, Nishan, Erotokritou-Mulligan, Ioulietta, Burford, Caroline, Strobridge, Gail, Brigg, Joanna, Drake, Tamsin, Bassett, E. Eryl, Cowan, David, Bartlett, Christiaan, Sönksen, Peter H., Holt, Richard I. G.
Format:	Journal Article
Language:	English
Published:	Bethesda, MD Endocrine Society 01-06-2010 Copyright by The Endocrine Society
Subjects:	Adolescent Aging - metabolism Biological and medical sciences Body Height - physiology Body Mass Index Body Weight - physiology Child Collagen Type III - blood Cross-Sectional Studies Doping in Sports - methods Endocrinopathies Epitopes False Positive Reactions Feeding. Feeding behavior Female Fundamental and applied biological sciences. Psychology Human Growth Hormone - pharmacology Humans Insulin-Like Growth Factor I - metabolism Male Medical sciences Procollagen - blood Reproducibility of Results Sex Characteristics Sports - physiology Substance Abuse Detection - methods Vertebrates: anatomy and physiology, studies on body, several organs or systems Vertebrates: endocrinology Young Adult Human Obesity Abuse Nutrition Nutrition disorder Metabolic diseases Collagen type III Insulin like growth factor 1 N terminal peptide Athlete Somatotropin Sport Adenohypophyseal hormone Adolescent Serum Diagnosis Detection Endocrinology Nutritional status
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Summary:	Context: A method based on two GH-dependent markers, IGF-I and pro-collagen type III N-terminal peptide (P-III-P), has been devised to detect exogenously administered GH. Because previous studies on the detection of GH abuse involved predominantly adult athletes, the method must be validated in adolescent athletes. Objective: The aim of the study was to examine serum IGF-I and P-III-P concentrations in elite adolescent athletes and to determine whether the method developed in adults is appropriate to detect GH abuse in this population. Design and Setting: We conducted a cross-sectional observational study at national sporting organization training events. Subjects: A total of 157 (85 males, 72 females) elite athletes between 12 and 20 yr of age participated in the study. Intervention: Serum IGF-I and P-III-P were each measured by two commercially available immunoassays. GH-2000 discriminant function scores were calculated. Results: Both IGF-I and P-III-P rose to a peak during adolescence, which was earlier in girls than in boys. All GH-2000 scores lay below the proposed cutoff limit of 3.7 (although some scores were close to this value), indicating that none of these athletes would be accused of GH doping if the GH-2000 discriminant formulae were used. The results between the two immunoassays for IGF-I and P-III-P were closely aligned. Conclusions: The GH-2000 score rises in early adolescence, reaches a peak in athletes aged 13–16 yr, and then falls. We have found no evidence that the proposed GH-2000 score developed in adults would lead to an unacceptable rate of false-positive results in adolescent athletes, but caution may be required around the time of peak growth velocity. The GH-2000 score, developed for detecting GH abuse in adult athletes, does not lead to false positive results when applied to adolescent elite athletes.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-972X 1945-7197
DOI:	10.1210/jc.2010-0008