The aim of the study was to determine if a decrease in serum insulin-like growth factor I (Igf-I) levels under marginal malnutrition is responsible for the lower physical performance of girls of a low socio-economic status (LSES).
Girls were selected after physical examination (Tanner's stage 1) and anthropometric measurements (height, body mass or mb, body mass index or BMI=mb height2).
Lean body mass mb, l was measured after skinfold thickness determination ; serum IGF-I, by radioimmunoassay ; maximal O2 consumption, (VO2max), directly during incremental exercise up to exhaustion ; and maximal aerobic power (Wmax). using the force-velocity test.
LSES girls (n=31) had been malnourished in the past and, currently, were suffering from marginal malnutrition : they were smaller (135.2 ± 5.5 vs 146.1 ± 4.3 cm), lighter (31.7 ± 3.9 vs 37.6 ± 5.0 kg), exhibited a lower mb, l (24.2 ± 2.5 vs 27.5 ± 3.0 kg) but same BMI compared with HSES (high socio-economic status) girls (n=32).
Igf-I levels (27.7 ± 7.9 vs 34.1 ± 6.5 nmol. l-1), VO2maX (45.26 ± 4.72 vs 50.74 ± 6.02 ml. min-1. kg-1 LBM) and Wmax (6.00 ± 1.15 vs 8.70<1.53 W. kg-1 mb, l were lower in LSES girls.
Moreover, the differences in every parameter were not the consequence of the younger age (10.8 ± 0.9 vs 11.2 ± 0.6 years) of the LSES girls. (...)
Mots-clés Pascal : Prépuberté, Facteur croissance IGF1, Performance physique, Exercice physique, Statut socioéconomique, Bolivie, Amérique du Sud, Amérique, Malnutrition, Consommation oxygène maximum, Alimentation, Enfant, Homme
Mots-clés Pascal anglais : Prepuberty, Insulin like growth factor 1, Physical performance, Physical exercise, Socioeconomic status, Bolivia, South America, America, Malnutrition, Maximum oxygen consumption, Feeding, Child, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0364714
Code Inist : 002B29B. Création : 12/09/1997.