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Fat Mediated Modulation of Reproductive and Endocrine Function in Young Athletes

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00946192
Recruitment Status : Active, not recruiting
First Posted : July 24, 2009
Last Update Posted : August 14, 2019
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Information provided by (Responsible Party):
Madhusmita Misra, Massachusetts General Hospital

Brief Summary:
One aim of this study is to determine changes in body composition and hormones that differentiate athletes who stop getting their periods versus those who continue to get their periods and non-athletes. The second aim of this study is to determine whether transdermal or oral estrogen (versus no estrogen) is effective in increasing bone density and improving bone microarchitecture in adolescent athletes who are not getting their periods and are thus estrogen deficient. The investigators hypothesize that transdermal estrogen will be more effective than oral estrogen or no estrogen in improving bone health in amenorrheic adolescent athletes.

Condition or disease Intervention/treatment Phase
Exercise-related Amenorrhea Drug: Transdermal 17Beta-estradiol, progesterone Drug: Ethinyl Estradiol + Desogestrel Dietary Supplement: Sham Comparator Phase 3

Detailed Description:
As many as 25% of adolescent and young adult endurance athletes develop amenorrhea, and factors that cause amenorrhea to occur in some, but not all, athletes have not been well characterized. Recent data indicate the critical importance of a negative energy balance state and leptin in regulating the Hypothalamic-pituitary-gonadal (H-P-G) axis. However, these factors do not completely account for alterations in this axis, and other contributing factors are unclear. Our preliminary data indicate the importance of low fat mass and fat related hormones in mediating hypogonadism in young athletes. This study will confirm these data and determine whether low fat mass and altered levels of adipokines, such as leptin and adiponectin, and hormones regulated by fat mass, such as ghrelin and peptide YY (PYY), determine alterations in LH pulsatility. A very concerning impact of amenorrhea in athletes is low bone mineral density (BMD). Preliminary data indicate lower BMD in adolescent athletes with amenorrhea (AA) compared with eumenorrheic athletes (EA) and non-athletic controls. The high prevalence of AA in adolescents is particularly concerning, because this population is potentially at greater risk as it is actively accruing bone. Of importance, bone microarchitecture, a better predictor of bone strength than BMD, has not been studied in AA. Because pubertal increases in estrogen are integral to optimizing peak bone mass, and AA is characterized by hypoestrogenism, this randomized study of transdermal estrogen versus oral estrogen or no estrogen will also examine whether estrogen replacement increases BMD and improves bone microarchitecture in adolescent AA 14-21 years old. EA and sedentary controls will be followed without intervention for this period. Despite the prevalent practice of prescribing oral contraceptives in AA, there is a paucity of data regarding benefits of this intervention in teenagers. Because transdermal estrogen, unlike oral estrogen, does not suppress IGF-1, an important bone anabolic factor, we expect effects of transdermal estrogen to exceed those of oral estrogen or no therapy. In addition, preliminary data indicate that low fat mass and alterations in fat related hormones may contribute to decreased bone accrual rates in athletes, and will be confirmed in this study. To summarize, a better understanding of the pathophysiology of reproductive dysfunction is critical to develop therapeutic strategies that will normalize the reproductive axis and bone accrual, and these are the questions that this study aims to answer.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 230 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Fat Mediated Modulation of Reproductive and Endocrine Function in Young Athletes
Actual Study Start Date : May 2009
Estimated Primary Completion Date : March 2020
Estimated Study Completion Date : April 2020

Arm Intervention/treatment
Experimental: Estrogen Patch
17Beta-estradiol transdermal patch twice weekly application for 12 months
Drug: Transdermal 17Beta-estradiol, progesterone
100 mcg/day 17Beta-estradiol; transdermal twice weekly application for 12 months (with cyclic micronized progesterone pills (Prometrium): 200 mg taken orally daily Day 1 to Day 12 each month) + Elemental calcium 1200 mg and Vit D 400 IU taken orally daily
Other Names:
  • Vivelle Dot transdermal patch
  • Prometrium

Active Comparator: Estrogen Pill
One pill containing estrogen and progesterone taken daily for 21 days followed by placebo pills only for 7 days; regimen repeated for 12 months.
Drug: Ethinyl Estradiol + Desogestrel
Oral ethinyl estradiol (0.03 mg) + desogestrel (0.15 mg) + Elemental calcium 1200 mg and Vit D 400 IU taken once daily
Other Name: Apri

Sham Comparator: Control
Elemental calcium 1200 mg and Vit D 400 IU taken orally daily
Dietary Supplement: Sham Comparator
Elemental calcium 1200 mg and Vit D 400 IU taken orally daily

Primary Outcome Measures :
  1. Increase in bone density with transdermal estrogen versus oral estrogen or no estrogen in amenorrheic athletes [ Time Frame: 12 months ]

Secondary Outcome Measures :
  1. Improvement in bone microarchitecture with transdermal estrogen versus oral estrogen or no estrogen in amenorrheic athletes [ Time Frame: 12 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   14 Years to 21 Years   (Child, Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Females 14-21 years old Note: Our pilot data are reassuring in that young women 18-25 years old with hypothalamic amenorrhea are not adversely affected with estrogen use. In fact, in our prospective study, beneficial effects were observed both in young women 18-25 years old using oral estrogen, and in 14-18 year old adolescent girls using transdermal estrogen. We therefore feel that including girls in the 14-21 year age range will not be hazardous to their bone health. In fact, given the lack of data in this age group, it is important to study younger women and teenagers rather than extrapolate data from studies in adults to this younger population. Hormone dynamics differ in teenagers compared with adults, and bone mass accrual is even more dependent on estrogen and IGF-1 in younger than older women who have already achieved peak bone mass.
  • Bone age (BA) >15 years Note: 99% of adult height is achieved at a BA of 15 years, thus estrogen replacement will not result in stunting of height potential after this age. Although we could have chosen to include girls with a BA >14 in this study, we are limiting this to girls with a BA of >15 years. This is because 2% of growth potential persists at a BA of 14 years, versus only 1% at a BA of 15 years (~0.6" of potential height (130)). Thus, to avoid potential stunting of growth potential with estrogen replacement, we have chosen to include girls with BA of > 15 years.
  • BMI between 10th-90th percentiles for age.
  • Amenorrhea (for AA): absence of menses for > three months (74) within a period of oligomenorrhea (cycle length > six weeks) for >six months, or absence of menarche at >16 years.
  • Eumenorrhea (EA and controls): > nine menses (cycle length 21-35 days) in preceding year.
  • Non-athlete healthy controls will be eligible if weight bearing exercise activity is less than two hours a week and if they are not participating in organized team sports.
  • Endurance athletes Note: severity of low BMD and menstrual dysfunction differ by kind of exercise and activity. For example, runners have a higher prevalence of menstrual irregularity than swimmers and cyclists (131). By limiting enrollment to endurance athletes, we will eliminate variability from the type of activity. Endurance training is defined as > 4 h of aerobic weight-bearing training of the legs or specific endurance training weekly, or > 20 miles of running weekly for a period of > 6 months in the last year.

Exclusion Criteria:

  • Other conditions that may affect bone metabolism

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00946192

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United States, Massachusetts
Massachusetts General Hospital
Boston, Massachusetts, United States, 02114
Sponsors and Collaborators
Massachusetts General Hospital
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
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Principal Investigator: Madhusmita Misra, MD, MPH Massachusetts General Hospital Pediatric Neuroendocrine Unit and Harvard Medical School

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):

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Responsible Party: Madhusmita Misra, Associate Professor of Pediatrics, Massachusetts General Hospital Identifier: NCT00946192     History of Changes
Other Study ID Numbers: 2009P000353
R01HD060827-01A1 ( U.S. NIH Grant/Contract )
First Posted: July 24, 2009    Key Record Dates
Last Update Posted: August 14, 2019
Last Verified: August 2019
Keywords provided by Madhusmita Misra, Massachusetts General Hospital:
Additional relevant MeSH terms:
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Menstruation Disturbances
Pathologic Processes
Estradiol 3-benzoate
Estradiol 17 beta-cypionate
Polyestradiol phosphate
Ethinyl Estradiol
Calcium-Regulating Hormones and Agents
Physiological Effects of Drugs
Hormones, Hormone Substitutes, and Hormone Antagonists
Contraceptive Agents
Reproductive Control Agents
Contraceptive Agents, Female
Contraceptives, Oral, Synthetic
Contraceptives, Oral