Trial reportNutrients2018
Effects of Vitamin D Supplementation on Haematological Values and Muscle Recovery in Elite Male Traditional Rowers.
Trial report in Nutrients, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
The trial behind it
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
34 citing papers in PubMed, 5 syntheses or guidelines pooled it, 53 citations in OpenAlex.
- Pooled it
- Are there prophylactic effects of vitamin D among healthier adult patients? A systematic review of randomized controlled trials.BMC nutrition · 2025Pooled it
- Do "testosterone boosters" really increase serum total testosterone? A systematic review.International journal of impotence research · 2024Pooled it
- Meta-Analysis of European Clinical Trials Characterizing the Healthy-Adult Serum 25-hydroxyvitamin D Response to Vitamin D Supplementation.Nutrients · 2023Pooled it
- Does testosterone mediate the relationship between vitamin D and prostate cancer progression? A systematic review and meta-analysis.Cancer causes & control : CCC · 2022Pooled it
- Eight-Week Vitamin DNutrients · 2026Trial
- Effect of vitamin DJournal of the International Society of Sports Nutrition · 2023Trial
- Seven-month wintertime supplementation of 1200 IU vitamin D has no effect on hand grip strength in young, physically active males: A randomized, controlled study.Journal of the International Society of Sports Nutrition · 2022Trial
- Iron: More than Meets the Eye.Nutrients · 2025Review
- Circulating growth hormone, cortisol and testosterone in relation to vitamin D status: influence of lower and upper body wingate anaerobic test in elite artistic gymnasts.BMC sports science, medicine & rehabilitation · 2025Article
- Injury, Risk and Training Habits Among Dog Agility Handlers: A Cross-Sectional Study.Journal of functional morphology and kinesiology · 2025Article
- Vitamin D and its relationship to performance and health during a competitive period in elite women's basketball and volleyball players.Physiological reports · 2025Article
- Vitamin D and Toxic Metals in Pregnancy - a Biological Perspective.Current epidemiology reports · 2024Review
- Effects of Vitamin D Supplementation in Elite Athletes: A Systematic Review.Orthopaedic journal of sports medicine · 2024Review
- Review
- Iron Status and Physical Performance in Athletes.Life (Basel, Switzerland) · 2023Review
- Immunologic, Anti-Inflammatory, and Anti-Muscle Damage Profile of Supplemented Vitamin DBiology · 2023Article
- Gender-related differences in the association of serum levels of vitamin D with body mass index in northern Iranian population: the PERSIAN Guilan Cohort Study (PGCS).BMC nutrition · 2022Article
- Relationship between dietary niacin intake and diabetes mellitus in the National Health and Nutrition Examination Survey (NHANES) 2003-2018.Eating and weight disorders : EWD · 2022Article
- Vitamin D deficiency in athletes: Laboratory, clinical and field integration.Asia-Pacific journal of sports medicine, arthroscopy, rehabilitation and technology · 2022Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionDeficient levels of 25-hydroxyvitamin D (25(OH)D) (<30 ng/mL) may compromise health and athletic performance. Supplementation with oral vitamin D can favor the state of iron metabolism, and testosterone and cortisol as an indicator of muscle recovery of the athlete with a deficiency. The main aim of this study was to evaluate the influence of eight weeks of supplementation with 3000 IU/day of vitamin D on the hematological and iron metabolism profile, as well as on the analytical values of testosterone and cortisol on elite male traditional rowers. The secondary aim was to examine if serum 25(OH)D is a predictor of testosterone and cortisol levels. MATERIAL AND
methodsThirty-six elite male rowers (27 ± 6 years) were assigned to one of the two groups randomly: 1) Control group (CG,
resultsStatistically significant and different increases were observed in the group-by-time interaction of 25(OH)D in VD3G in respect to CG during the study (
conclusionOral supplementation with 3000 IU/day of vitamin D3 during eight weeks showed to be sufficient to prevent a decline in hematological levels of hemoglobin and hematocrit, and improve transferrin of 25(OH)D levels. However, although it was not sufficient to enhance muscle recovery observed by testosterone and cortisol responses, it was observed that serum 25(OH)D levels could be a predictor of anabolic and catabolic hormones.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.