Testosterone Levels in Athletes at Rest and Exhaustion: Effects of Calcium Supplementation
Abstract
The effects of 4 weeks of calcium supplementation on free- and total testosterone levels were established in active and sedentary adult males at rest and exhaustion. Thirty healthy male athletes were equally divided into three study groups, as follows: Group 1-non-exercising subjects receiving 35 mg calcium/kg body weight; Group 2-subjects receiving 35 mg calcium/kg body weight undergoing training routines for 90 min/day, 5 days a week and Group 3-subjects undergoing training routines for 90 min/day, 5 days a week. The testosterone levels were determined before and after supplementation, at rest and following a hard training routine. The plasma free- and total testosterone levels increased at exhaustion before and after supplementation relative to resting values (p < 0.05). This was also true when active subjects were compared to inactive subjects (p < 0.05). Our results show that training results in increased testosterone levels in athletes and that the increase is greater if accompanied by calcium supplementation, which may be useful for increasing overall athletic performance.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Many studies on minerals yielded inconclusive findings, particularly in the context of confounders such as baseline deficiencies and activity levels.
“In terms of our outcomes of interest, many of the studies yielded inconclusive findings, particularly in the context of several confounders like baseline deficiencies and activity levels.[85][86][87]”
From A systematic appraisal of emerging alternative therapies in men’s health and wellness (2025) · cites this paper as [85]
No citation lists for this paper
No citation lists for this paper yet — checked again daily.
References 23 · Cited by 8
- Authors
- Cinar, V., Baltaci, A. K., Mogulkoc, R., & Kilic, M.
- Affiliations
- Selçuk University (TR)
- Venue
- Biological Trace Element Research
- Published
- 2008-12-20
- Volume
- 129
- Issue
- 1-3
- Pages
- 65-69
- ISSN
- 0163-4984 (ISSN-L)
- 1559-0720
- OpenAlex
- W2018193655
- Cited by
- 8
- References
- 23
- Citations by year
- 2023: 2 · 2021: 1 · 2019: 1 · 2016: 1 · 2015: 1
- FWCI
- 0.48
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Biological Trace Element Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
- Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- testosterone, calcium supplementation, athletes, exhaustion, free testosterone, total testosterone, exercise training, athletic performance, sedentary men
- MeSH terms
- Adolescent, Adult, Calcium Gluconate, Exercise Test, Fatigue, Humans, Male, Reference Values, Rest, Testosterone, Exercise, Dietary Supplements
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
