Assessing the Impact of Contraceptives on Bone Health Using 41Ca
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|ClinicalTrials.gov Identifier: NCT02367846|
Recruitment Status : Active, not recruiting
First Posted : February 20, 2015
Last Update Posted : January 26, 2021
|Condition or disease||Intervention/treatment||Phase|
|Other Disorders of Bone Development and Growth||Drug: Combined Oral Contraceptive (COC) Drug: Contraceptive Vaginal Ring (CVR)||Phase 4|
This study is a preclinical, multi-site study (Penn State University and Purdue University) that will determine whether the negative effects of combined oral contraceptive (COC) therapy on bone turnover are dependent on the route of administration such that an attenuation of these effects is observed when a comparable dose of non-oral contraceptive therapy, such as vaginal contraceptive (CVR) therapy is also tested. Millions of women use COC therapy for birth control purposes or regulation of menstrual cycles. CVR therapy is a relatively new FDA-approved contraceptive alternative to COC. The purpose of the proposed project is to investigate whether oral ethinyl estradiol (EE) may negatively impair bone turnover when compared to vaginally-administered EE in young physically-active women.
A novel calcium tracer technology suitable to rapidly assess changes in net bone calcium balance in a small sample size will be applied to evaluate the effects of COC and CVR therapy on bone turnover. The radioisotope Calcium-41 (41Ca) demonstrates increased sensitivity when compared to dual x-ray absorptiometry (DXA) and increased specificity for bone mineralization and precision when compared to biochemical markers of bone turnover. This study will be the first study to examine how the route of estrogen administration affects bone turnover in young physically active women by assessing changes in net bone calcium balance with different forms of contraceptive therapy.
The overall purpose of this study is to explore the effects of oral versus vaginal contraceptive therapy on bone turnover in young exercising women using 41Ca technology. In an effort to expose the route-dependent effects of oral versus non-oral contraceptive therapy on bone turnover, the investigators will examine 1) the effects of ethinyl estradiol on bone calcium balance using the 41Ca technology and 2) the underlying physiological mechanisms associated with the effects of oral versus vaginal contraceptive therapy on net bone calcium balance.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||6 participants|
|Intervention Model:||Crossover Assignment|
|Masking:||None (Open Label)|
|Primary Purpose:||Basic Science|
|Official Title:||The Effect of Oral vs. Non-oral Contraceptive Therapy on Bone Turnover Using 41Ca Methodology|
|Study Start Date :||January 2015|
|Estimated Primary Completion Date :||December 2022|
|Estimated Study Completion Date :||December 2022|
Experimental: Combined Oral Contraceptive (COC)
We are testing the effects of a COC (Apri (Reclipsen); 30 µg EE, 150 µg desogestrel). On the first day of the intervention, the participants randomized to COC will begin taking the pill. One pill will be ingested orally at the same time each day for days 1-49 of the intervention. Pills ingested during days 1-21 and during days 29-49 will be active tablets. Pills ingested on days 22-28 will be tablets without active ingredients. Each participant in the COC group will ingest a pill from the first pack each day for the first 28 days then begin the second pack. If a participant is unable to collect a 24-h urine sample on day 49, she will take active tablets from the third pill pack until she has collected the 24-h urine sample.
Drug: Combined Oral Contraceptive (COC)
The proposed study is a preclinical, multi-site trial comparing the short-term effects of oral vs. non-oral ethinyl estradiol on net bone calcium balance. A prospective crossover study with repeated measures and a simple random assignment will be used to test the effects of 49 days of COC use on bone metabolism using 41Ca to determine net bone calcium balance. Subjects will be randomized to receive COC during either the first or second intervention period.
Other Name: Apri (Reclipsen)
Experimental: Contraceptive Vaginal Ring (CVR)
We are testing the effects of the vaginal ring (Nuva Ring; 15 µg/d EE, 120 µg/d etonogestrel). When randomized to CVR, participants will insert the contraceptive ring into their vagina . The ring will be worn during weeks 1-3, and again during weeks 5-7. During week 4, no ring will be worn to allow for withdrawal bleeding. If a participant is unable to collect a 24-h urine sample on day 49, they will insert a third ring which will remain in the vagina until she has collected a 24-h urine sample.
Drug: Contraceptive Vaginal Ring (CVR)
The proposed study is a preclinical, multi-site trial comparing the short-term effects of oral vs. non-oral ethinyl estradiol on net bone calcium balance. A prospective crossover study with repeated measures and a simple random assignment will be used to test the effects of 49 days of CVR use on bone metabolism using 41Ca to determine net bone calcium balance. Subjects will be randomized to receive CVR during either the first or second intervention period.
Other Name: Nuva Ring
- Changes in 41Ca:Ca ratio [ Time Frame: 49 days of contraceptive therapy ]Changes in the 41Ca:Ca ratio in 24-h urine samples measured every 10-14 days during and after oral and non-oral contraceptive therapy as determined by Accelerometer Mass Spectrometry
- Changes in serum concentrations of insulin-like growth factor-1 (IGF-1), IGF-binding proteins (IGFBP-1, IGFBP-3), and acid labile subunit (ALS) [ Time Frame: 49 days of contraceptive therapy ]Changes in fasting serum concentrations of IGF-1, IGFBP-1, IGFBP-3, and ALS after oral and non-oral contraceptive therapy
- Changes in serum concentrations of markers of bone formation and bone resorption [ Time Frame: 49 days of contraceptive therapy ]Changes in fasting serum concentrations of markers of bone formation (osteocalcin, P1NP) and bone resorption (CTx) after oral and non-oral contraceptive therapy
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 ClinicalTrials.gov identifier (NCT number): NCT02367846
|United States, Pennsylvania|
|Women's Health and Exercise Laboratories, The Pennsylvania State University|
|University Park, Pennsylvania, United States, 16802|
|Principal Investigator:||Mary Jane De Souza, PhD||Penn State University|