Trial reportEndocrine2018
Effects of chronic endurance exercise training on serum 25(OH)D concentrations in elderly Japanese men.
Trial report in Endocrine, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 1 of them a synthesis 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
24 citing papers in PubMed, 1 synthesis or guideline pooled it.
- The 2024 Endocrine Society Guideline on Vitamin D: Comprehensive Summary and Critical Appraisal.Nutrients · 2026Pooled it
- Exercise without Weight Loss Prevents Seasonal Decline in Vitamin D Metabolites: The VitaDEx Randomized Controlled Trial.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Trial
- Trial
- Ultra-Marathon-Induced Increase in Serum Levels of Vitamin D Metabolites: A Double-Blind Randomized Controlled Trial.Nutrients · 2020Trial
- Trial
- The effect of an exercise program in pregnancy on vitamin D status among healthy, pregnant Norwegian women: a randomized controlled trial.BMC pregnancy and childbirth · 2019Trial
- Effect of Exercise Training on 1,25(OH)Sports healthTrial
- Effects of floorball and strength training in a real-life setting on health and physical function in older men.Frontiers in aging · 2025Article
- Review
- The effect of aquatic training and vitamin D3 supplementation on bone metabolism in postmenopausal obese women.Journal of exercise science and fitness · 2024Article
- Review
- Vitamin D level regulates serum lipids discrepantly in adults with and without dyslipidemia.Endocrine connections · 2023Article
- Article
- The effect of obesity on metabolic parameters: a cross sectional study in adult women.African health sciences · 2022Article
- Review
- Does vitamin D supplementation improve bone health, body composition and physical performance beyond endurance exercise in patients with type 2 diabetes: A secondary analysis of randomized controlled trial.Frontiers in physiology · 2022Article
- Article
- Article
- Vitamin D Status and Its Correlation With Anthropometric and Biochemical Indicators of Cardiometabolic Risk in Serbian Underground Coal Miners in 2016.Frontiers in nutrition · 2021Article
- Vitamin D, sport and health: a still unresolved clinical issue.Journal of endocrinological investigation · 2020Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundHigher levels of physical activity and cardiorespiratory fitness are positively related to serum 25-hydroxyvitamin D [25(OH)D] concentrations; however, the response of 25(OH)D concentrations to chronic endurance exercise training is unclear. Therefore, the purpose of this study was to elucidate whether serum 25(OH)D concentrations were directly increased by 5 weeks of endurance exercise training and influenced by changes in body fat in elderly men.
methodsTwenty elderly Japanese men were randomized to either the 5-week endurance exercise training group (ET group; N = 10) or the sedentary control group (SC group; N = 10). Fasting blood samples were collected to determine serum 25(OH)D and other blood parameters. The visceral fat area and hepatic fat content were assessed by magnetic resonance imaging and proton magnetic resonance spectroscopy, respectively.
resultsAfter 5 weeks of endurance exercise training, the levels of maximal oxygen uptake (VO
conclusionsThe results of our study suggest that 5 weeks of endurance training could inhibit the seasonal reduction in serum 25(OH)D concentrations without changes in body fat.
Indexed as
Identifiers
29170904What OpenQuestion holds
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.