Assessing the Impact of Contraceptives on Bone Health Using 41Ca

Summary

This preclinical randomized crossover study will examine the effects of oral versus non-oral contraceptive therapy on bone turnover in young exercising women. 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 non-oral contraceptive therapy on net bone calcium balance.

Timeline

Start

2015-01

Primary completion

2028-12

Completion

2028-12

Publications

• Background Grossman D, White K, Hopkins K, Amastae J, Shedlin M, Potter JE. Contraindications to combined oral contraceptives among over-the-counter compared with prescription users. Obstet Gynecol. 2011 Mar;117(3):558-565. doi: 10.1097/AOG.0b013e31820b0244.
• Background Lee WH, Wastney ME, Jackson GS, Martin BR, Weaver CM. Interpretation of 41Ca data using compartmental modeling in post-menopausal women. Anal Bioanal Chem. 2011 Feb;399(4):1613-22. doi: 10.1007/s00216-010-4454-5. Epub 2010 Dec 9.
• Background Weaver CM, Martin BR, Jackson GS, McCabe GP, Nolan JR, McCabe LD, Barnes S, Reinwald S, Boris ME, Peacock M. Antiresorptive effects of phytoestrogen supplements compared with estradiol or risedronate in postmenopausal women using (41)Ca methodology. J Clin Endocrinol Metab. 2009 Oct;94(10):3798-805. doi: 10.1210/jc.2009-0332. Epub 2009 Jul 7.
• Background Denk E, Hillegonds D, Vogel J, Synal A, Geppert C, Wendt K, Fattinger K, Hennessy C, Berglund M, Hurrell RF, Walczyk T. Labeling the human skeleton with 41Ca to assess changes in bone calcium metabolism. Anal Bioanal Chem. 2006 Nov;386(6):1587-602. doi: 10.1007/s00216-006-0795-5. Epub 2006 Oct 11.
• Ricker EA, De Souza MJ, Stone MS, Jackson GS, McCabe GP, McCabe LD, Weaver CM. Differential bone calcium retention with the use of oral versus vaginal hormonal contraception: A randomized trial using calcium-41 radiotracer. Contraception. 2025 Mar;143:110778. doi: 10.1016/j.contraception.2024.110778. Epub 2024 Nov 28.

Drugs

Indications