ArticlePhysiological reports2023
Does chronic oral contraceptive use detrimentally affect C-reactive protein or iron status for endurance-trained women?
Article in Physiological reports, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
5 citing papers in PubMed, 5 citations in OpenAlex.
- Association of dietary iron intake and serum iron with self-reported history of pregnancy loss among women: a cross-sectional study based on NHANES 2005-2018.BMC endocrine disorders · 2026Article
- Interplay of Total Antioxidant Capacity and Oxidative Stress Hydroperoxides with Circulating Biomarkers of Inflammation and Iron Status According to Oral Contraception Use.Antioxidants (Basel, Switzerland) · 2026Article
- Cardiometabolic, Glycaemic, and Metabolic Safety of Hormonal Contraceptives in Women with Medical Conditions: A Systematic Review.International journal of women's health · 2026Review
- Physical activity and diet pattern do not mitigate C-reactive protein increases associated with oral contraceptive use.PloS one · 2025Article
- Does chronic oral contraceptive use detrimentally affect C-reactive protein or iron status for endurance-trained women?Physiological reports · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeChronic use of the oral contraceptive pill (OCP) is reported to increase C-reactive protein (CRP) levels and increase the risk of cardiovascular disease in premenopausal females.
methodsA secondary analysis of data from two research studies in eumenorrheic (n = 8) and OCP (n = 8) female athletes. Basal CRP and iron parameters were included in the analysis. Sample collection occurred following a standardized exercise and nutritional control for 24 h. Eumenorrheic females were tested in the early-follicular and mid-luteal phases, and the OCP users were tested in quasi-follicular and quasi-luteal phases (both active pill periods).
resultsA main effect for group (p < 0.01) indicated that average CRP concentration was higher in OCP users compared with eumenorrheic females, regardless of the day of measurement within the cycle. Results demonstrate a degree of iron parameters moderation throughout the menstrual cycle that is influenced by basal CRP levels; however, no linear relationship with CRP, serum iron, and ferritin was observed.
conclusionsBasal CRP values were consistently higher in the OCP group despite participants being in a rested state. These results may indicate a potential risk of cardiovascular disease in prolonged users of the OCP when compared to eumenorrheic female athletes.
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Registered trials
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