ArticleScientific reports2021
Seasonal variability of the vitamin D effect on physical fitness in adolescents.
Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 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.
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.
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Who cites it
16 citing papers in PubMed.
- Positive Effects of Vitamin D Supplementation in Patients Hospitalized for COVID-19: A Randomized, Double-Blind, Placebo-Controlled Trial.Nutrients · 2022Trial
- Trial
- HOMA Index, Vitamin D Levels, Body Composition and Cardiorespiratory Fitness in Juvenile Obesity: Data from the CHILT III Programme, Cologne.International journal of environmental research and public health · 2022Trial
- Vitamin D status and adiposity in children with low-energy fractures: a prospective case-control study.European journal of pediatrics · 2026Observational
- Association between serum 25-hydroxyvitamin D concentrations and respiratory infections in US preschool children: a population-based study.European journal of pediatrics · 2025Article
- Vitamin D status and muscle strength in a pan-European cohort of children and adolescents with normal weight and overweight/obesity.European journal of pediatrics · 2025Article
- Prevalence and trends of vitamin D deficiency in a Saudi Arabian population: a five-years retrospective study from 2017 to 2021.Frontiers in public health · 2025Article
- Vitamin D Supply of Multivitamins Commercialized Online by Amazon in Western and Southern Europe: A Labeling Analysis.Nutrients · 2023Article
- Vitamin D in pediatric age: Current evidence, recommendations, and misunderstandings.Frontiers in medicine · 2023Article
- Impaired Height Growth Associated with Vitamin D Deficiency in Young Children from the Japan Environment and Children's Study.Nutrients · 2022Article
- Different Vitamin D Supplementation Strategies in the First Years of Life: A Systematic Review.Healthcare (Basel, Switzerland) · 2022Review
- Review
- Review
- Obesity and Infection: What Have We Learned From the COVID-19 Pandemic.Frontiers in nutrition · 2022Review
- Article
- Vitamin D Status in Adolescents during COVID-19 Pandemic: A Cross-Sectional Comparative Study.Nutrients · 2021Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Studies investigating the relationship between vitamin D and physical fitness in youth have provided inconsistent findings. Recent evidence indicates that the expression of receptors and vitamin D-modulated genes in young subjects has a seasonal profile. Therefore, we investigated the role of vitamin D on physical fitness across seasons in a total of 977 male adolescents. Anthropometrics, lifestyle, dietary habits, biochemical profiles and physical fitness were studied. Multiple linear regression models, including pairwise interaction terms involving total 25-OH-vitamin D, were fitted. The interacting effect of season and total 25-OH-vitamin D had a significant influence on physical fitness performance (spring and total 25-OH-vitamin D: ß 0.19, SE 0.07, p = 0.007; summer and total 25-OH-vitamin D: ß 0.10, SE 0.06, p = 0.11; autumn and total 25-OH-vitamin D: ß 0.18, SE 0.07, p = 0.01), whereas the main effect of total 25-OH-vitamin D alone was not significant (p = 0.30). Body fat percentage, recreational physical activity level, time spent per day gaming/TV-watching, smoking, and hemoglobin levels were also related to the physical fitness performance score. Future studies should further explore the role of seasonal-dependent effects of vitamin D on health.
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