TY - JOUR
T1 - Influence of ethnicity on IGF-I and procollagen III peptide (P-III-P) in elite athletes and its effect on the ability to detect GH abuse
AU - Erotokritou-Mulligan, Ioulietta
AU - Bassett, E. Eryl
AU - Cowan, David A.
AU - Bartlett, Christiaan
AU - McHugh, Cathy
AU - Sonksen, Peter H.
AU - Holt, Richard I. G.
PY - 2009/1
Y1 - 2009/1
N2 - A method based on the two GH dependent markers, IGF-I and procollagen III peptide (P-III-P) has been proposed to detect exogenously administered GH. As previous studies involved predominantly white European elite athletes, it is necessary to validate the method in other ethnic groups.
To examine serum IGF-I and P-III-P in elite athletes of different ethnicities within 2 h of competing at national or international events.
Cross-sectional observational study.
National and International sporting events.
1085 elite athletes of different ethnicities.
Serum IGF-I and P-III-P were measured and GH-2000 discriminant function score was calculated. Effect of ethnicity was assessed.
In men, IGF-I was 21.7 +/- 2.6% lower in Afro-Caribbeans than white Europeans (P <0.0001) but there were no differences between other ethnic groups. In women, IGF-I was 14.2 +/- 5.1% lower in Afro-Caribbeans (P = 0.005) and 15.6 +/- 7.0% higher in Orientals (P = 0.02) compared with white Europeans. P-III-P was 15.2 +/- 3.5%, 26.6 +/- 6.6% and 19.3 +/- 5.8% lower in Afro-Caribbean (P <0.0001), Indo-Asian (P <0.0001) and Oriental men (P = 0.001), respectively, compared with white European men. In women, P-III-P was 15.7 +/- 4.7% lower in Afro-Caribbeans compared to white Europeans (P = 0.0009) but there were no differences between other ethnicities. Despite these differences, most observations were below the upper 99% prediction limits derived from white European athletes. All GH-2000 scores lay below the cut-off limit proposed for doping.
The GH-2000 detection method based on IGF-I and P-III-P would be valid in all ethnic groups.
AB - A method based on the two GH dependent markers, IGF-I and procollagen III peptide (P-III-P) has been proposed to detect exogenously administered GH. As previous studies involved predominantly white European elite athletes, it is necessary to validate the method in other ethnic groups.
To examine serum IGF-I and P-III-P in elite athletes of different ethnicities within 2 h of competing at national or international events.
Cross-sectional observational study.
National and International sporting events.
1085 elite athletes of different ethnicities.
Serum IGF-I and P-III-P were measured and GH-2000 discriminant function score was calculated. Effect of ethnicity was assessed.
In men, IGF-I was 21.7 +/- 2.6% lower in Afro-Caribbeans than white Europeans (P <0.0001) but there were no differences between other ethnic groups. In women, IGF-I was 14.2 +/- 5.1% lower in Afro-Caribbeans (P = 0.005) and 15.6 +/- 7.0% higher in Orientals (P = 0.02) compared with white Europeans. P-III-P was 15.2 +/- 3.5%, 26.6 +/- 6.6% and 19.3 +/- 5.8% lower in Afro-Caribbean (P <0.0001), Indo-Asian (P <0.0001) and Oriental men (P = 0.001), respectively, compared with white European men. In women, P-III-P was 15.7 +/- 4.7% lower in Afro-Caribbeans compared to white Europeans (P = 0.0009) but there were no differences between other ethnicities. Despite these differences, most observations were below the upper 99% prediction limits derived from white European athletes. All GH-2000 scores lay below the cut-off limit proposed for doping.
The GH-2000 detection method based on IGF-I and P-III-P would be valid in all ethnic groups.
U2 - 10.1111/j.1365-2265.2008.03319.x
DO - 10.1111/j.1365-2265.2008.03319.x
M3 - Article
SN - 1365-2265
VL - 70
SP - 161
EP - 168
JO - Clinical endocrinology
JF - Clinical endocrinology
IS - 1
ER -
