Az elhízás hatásának vizsgálata a lányok pubertáskori fejlődésére
Background:
Studies suggest that overweight girls may be developing breast tissue, and therefore starting puberty, earlier than normal weight girls. However, it is hard to distinguish breast tissue from fatty tissue. Researchers think that by using breast ultrasound, among other tests, they can do a better job of telling whether an overweight girl has breast tissue. This will help them understand if overweight girls are truly entering puberty before normal weight girls.
Objective:
To find out if overweight girls go through puberty earlier than normal weight girls.
Eligibility:
Healthy girls 8-14 years old who:
- Are normal weight or overweight
- Have some breast development
- Have not started their first period
Design:
Parents of participants will be screened over the phone.
Most participants will have 1 visit. However, they can choose to have multiple visits within 4 weeks. The visit will include:
- Physical exam that includes examination of the breasts and genital area
- Breast ultrasound: A small hand-held device will be passed back and forth over the chest. It uses sound waves to create a picture of the breast tissue.
- Pelvic ultrasound: A small, handheld device will be passed back and forth over the lower belly. It uses sound waves to create a picture of the ovaries.
- Urine and blood test
- A special x-ray called a DXA to measure the amount of fat in the body: The participant will lie still on a table while the x-ray takes pictures of the body.
X-ray of the hand: The picture will tell researchers how mature the participant s bones are.
Participants may be asked to come back 6 months later to repeat these tests.
A tanulmány áttekintése
Állapot
Körülmények
Részletes leírás
Over the past decade, there has been an alarming trend toward earlier breast development in girls. The contemporaneous obesity epidemic has led to speculation that obesity may be driving early puberty. However, questions remain about the validity of reports of early puberty among obese girls due to the difficulty in distinguishing fatty tissue from breast tissue in this population. The physiological basis for early puberty among obese girls is also unknown. The current proposal aims to investigate pubertal development in pre-menarchal obese compared with normal weight girls using more robust methods such as breast morphological staging via ultrasonography and intensive reproductive axis phenotyping. Study procedures include blood draws, DXA (for body composition), hand x-ray (for bone age), breast and transabdominal (pelvic) ultrasounds, and anthropometrics.
Tanulmány típusa
Beiratkozás (Tényleges)
Kapcsolatok és helyek
Tanulmányi helyek
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North Carolina
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Research Triangle Park, North Carolina, Egyesült Államok, 27709
- NIEHS, Research Triangle Park
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Részvételi kritériumok
Jogosultsági kritériumok
Tanulmányozható életkorok
Egészséges önkénteseket fogad
Tanulmányozható nemek
Mintavételi módszer
Tanulmányi populáció
community sample
Leírás
- INCLUSION CRITERIA:
- Girls without a chronic medical condition
- Normal weight (BMI 5th-85th%) or overweight/obese (BMI > 85th%)
- 8-14 years old
- Some breast development
- Pre-menarchal
EXCLUSION CRITERIA:
- Treated with medications that may affect reproductive hormones (e.g. birth control pills).
- Pregnancy
During the study, the PI s discretion may be used to determine final eligibility. The PI s discretion may be used at any point in the study (pre-screening, clinical/lab assessments, etc.) to ensure participants are not subjected to unnecessary procedures or visits.
Tanulási terv
Hogyan készül a tanulmány?
Tervezési részletek
- Megfigyelési modellek: COHORT
- Időperspektívák: PROSPECTIVE
Kohorszok és beavatkozások
Csoport / Kohorsz |
|---|
|
normal weight
Girls age 8-14 below 85% in respect to weight for their age group |
|
overweight
Girls age 8-14 at or above 85% in respect to weight for their age group |
Mit mér a tanulmány?
Elsődleges eredményintézkedések
Eredménymérő |
Intézkedés leírása |
Időkeret |
|---|---|---|
|
To determine the correlation between Tanner breast staging and breast maturation scores using breast ultrasound in girls
Időkeret: semiannually
|
To test the hypothesis that breast maturation in obese and normal weight girls primarily reflects hypothalamic-pituitary-ovarian activation as opposed to local (breast adipose tissue) estrogen production, we will use linear regression to determine if the relationship between breast maturation and ovarian size, uterine size and bone age (all markers of end organ response to estrogen) differs between the two weight groups (group by ovarian/uterine size/bone age interaction term). The finding of similar regression lines in the two groups would support this hypothesis while an upward shift in the regression line (greater y-intercept, similar slope) in the obese girls would indicate that a given breast maturation stage is achieved at a smaller ovarian/uterine volume and younger bone age in obese girls, suggesting the presence of an additional source of estrogen (adipose tissue) in obese girls. |
semiannually
|
Másodlagos eredményintézkedések
Eredménymérő |
Intézkedés leírása |
Időkeret |
|---|---|---|
|
To determine the contribution of peripheral aromatization to breast development in obese girls.
Időkeret: semiannually
|
Repeated measures from the same subject (visits 1,2, and follow up visits) will provide preliminary data for future studies investigating whether there is a difference in the pace of pubertal development in obese compared with normal weight girls. Squamous cells in the urine sample will be categorized as either superficial (mature; eg indicating estrogen exposure) or other . The primary measure of estrogenization will be the percent of superficial cells (%S), as previously described (Adgent 13, Robine 88). The %S will be compared between normal weight and obese subjects after controlling for breast stage determined by ultrasound. We anticipate that up to 25% of urine specimens may need to be excluded because of insufficient cells or inflammation and this may require an increase in enrollment. |
semiannually
|
Együttműködők és nyomozók
Nyomozók
- Kutatásvezető: Natalie D Shaw, M.D., National Institute of Environmental Health Sciences (NIEHS)
Publikációk és hasznos linkek
Általános kiadványok
- Herman-Giddens ME, Kaplowitz PB, Wasserman R. Navigating the recent articles on girls' puberty in Pediatrics: what do we know and where do we go from here? Pediatrics. 2004 Apr;113(4):911-7. doi: 10.1542/peds.113.4.911. No abstract available.
- Kaplowitz PB. Link between body fat and the timing of puberty. Pediatrics. 2008 Feb;121 Suppl 3:S208-17. doi: 10.1542/peds.2007-1813F.
- Ahmed ML, Ong KK, Dunger DB. Childhood obesity and the timing of puberty. Trends Endocrinol Metab. 2009 Jul;20(5):237-42. doi: 10.1016/j.tem.2009.02.004. Epub 2009 Jun 21.
- Ortega MT, McGrath JA, Carlson L, Flores Poccia V, Larson G, Douglas C, Sun BZ, Zhao S, Beery B, Vesper HW, Duke L, Botelho JC, Filie AC, Shaw ND. Longitudinal Investigation of Pubertal Milestones and Hormones as a Function of Body Fat in Girls. J Clin Endocrinol Metab. 2021 May 13;106(6):1668-1683. doi: 10.1210/clinem/dgab092.
- Malave-Ortiz S, McNeley SAM, Denslow S, Bangma J, Ferguson KK, Fenton SE, Shaw ND. The association between PFAS exposure, menstrual cycle parameters, and reproductive hormones in adolescent girls. J Clin Endocrinol Metab. 2026 Aug 13;111(9):2502-2512. doi: 10.1210/clinem/dgag148.
Hasznos linkek
Tanulmányi rekorddátumok
Tanulmány főbb dátumok
Tanulmány kezdete (Tényleges)
Elsődleges befejezés (Becsült)
A tanulmány befejezése (Becsült)
Tanulmányi regisztráció dátumai
Először benyújtva
Először nyújtották be, amely megfelel a minőségbiztosítási kritériumoknak
Első közzététel (Becsült)
Tanulmányi rekordok frissítései
Utolsó frissítés közzétéve (Tényleges)
Az utolsó frissítés elküldve, amely megfelel a minőségbiztosítási kritériumoknak
Utolsó ellenőrzés
Több információ
A tanulmányhoz kapcsolódó kifejezések
Kulcsszavak
További vonatkozó MeSH feltételek
Egyéb vizsgálati azonosító számok
- 160006
- 16-E-0006
Terv az egyéni résztvevői adatokhoz (IPD)
Tervezi megosztani az egyéni résztvevői adatokat (IPD)?
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