ESPE Abstracts (2014) 82 FC14.2

Infancy Growth Rate Predicts Timing of Puberty Both in Girls and Boys

Banu Kucukemre Aydina, Esra Devecioglub, Sezin Kisabacaka, Alev Kadiogluc, Gulbin Gokcayb, Firdevs Basa, Sukran Poyrazoglua, Ruveyde Bundaka, Nurcin Sakaa & Feyza Darendelilera

aPediatric Endocrinology Unit, Department of Pediatrics, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey; bSocial Pediatrics Unit, Department of Pediatrics, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey; cALKA Radiodiagnostics Center, Istanbul, Turkey

Introduction: Rate of weight gain during early childhood may have an effect on timing of puberty in girls. Biological mechanisms underlying this condition are not fully understood. Studies examining this association in boys report contradictory results. Our aim was to examine the effects of growth rate during the first years of life on the onset of puberty both in girls and boys.

Description of methods: 159 children aged between 6 and 9 years who were attending the Well Child Clinic between the ages of 1 month and 5 years were included in the study. Anthropometric measurements during the follow-up were obtained from children’s files. Weight, height, waist and hip circumferences were measured and pubertal staging was done at the time of investigation at a mean age of 7.6±0.9 years. Blood samples for LH, FSH and estradiol/testosterone were collected. Breast and pelvic ultrasonography was done.

Results: 21.2% of girls had breast enlargement before the age of 8 years, 17.6% had breast enlargement between 8 and 9 years, and 7.1% had premature pubarche. 12.2% of boys had testicular enlargement starting before the age of 9 years and 7.1% had premature pubarche. The average BMI SDS and waist circumference SDS of girls demonstrating findings of puberty were significantly higher (P=0.001 and P=0.03). Girls having an accelerated weight gain between 6 and 15 months of age demonstrated precocious puberty signs more often (P=0.007) and at the ages of 6–9 years their average BMI SDS were higher compared to the peers (P=0.01). Boys having an accelerated linear growth between 9 and 15 months of age demonstrated pubertal findings more frequently (P=0.004).

Conclusions: Our results suggest that early growth acceleration is important for the timing of puberty in both sexes but the girls and boys with precocious puberty showed different growth patterns and probably different mechanisms.

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