ArticleThe Journal of nutrition2018
Duration of Retinol Isotope Dilution Studies with Compartmental Modeling Affects Model Complexity, Kinetic Parameters, and Calculated Vitamin A Stores in US Women.
Article in The Journal of nutrition, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 19 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.
Vitamin A Kinetics and Mathematical Modeling in American Women
Validation and Simplification of the Retinol Isotope Dilution Technique in Burkinabe Schoolchildren
Who cites it
19 citing papers in PubMed, 1 synthesis or guideline pooled it, 41 citations in OpenAlex.
- Selected laboratory-based biomarkers for assessing vitamin A deficiency in at-risk individuals.The Cochrane database of systematic reviews · 2025Pooled it
- Dietary intake of preformed vitamin A and provitamin A carotenoids are not associated with serum retinol and carotenoid concentrations among children 36-59 months of age in rural Burkina Faso: a cross-sectional study.European journal of nutrition · 2023Trial
- Analysis of 13C Enrichment of Vitamin A in Biological Samples by Gas Chromatography-Combustion-Isotope Ratio Mass Spectrometry.Journal of visualized experiments : JoVE · 2025Article
- Synthesis of 13C2-Retinyl Acetate and Dose Preparation for Retinol Isotope Dilution Tests.Journal of visualized experiments : JoVE · 2025Article
- Metabolomics profiling of hypervitaminosis A in South African preschoolers is characterised by modified serum lysophospholipids and oxylipins.The British journal of nutrition · 2025Article
- Use of Population-Based Compartmental Modeling and Retinol Isotope Dilution to Study Vitamin A Kinetics and Total Body Stores among Ghanaian Women of Reproductive Age.Current developments in nutrition · 2024Article
- Hepatic Vitamin A Concentrations and Association with Infectious Causes of Child Death.The Journal of pediatrics · 2024Article
- A comparative study on indicators of vitamin A status and risk factors for sensitivity and specificity of the methods to detect vitamin A deficiency.Nutrition & metabolism · 2023Article
- Use of Compartmental Modeling and Retinol Isotope Dilution to Determine Vitamin A Stores in Young People with Sickle Cell Disease Before and After Vitamin A Supplementation.The Journal of nutrition · 2023Article
- Comparison of Total Body Vitamin A Stores Using Individual versus PopulationThe Journal of nutrition · 2023Article
- Dietary vitamin A intakes of chinese children with adequate liver stores as assessed by the retinol isotope dilution technique.BMC pediatrics · 2022Article
- Overlapping Vitamin A Interventions with Provitamin A Carotenoids and Preformed Vitamin A Cause Excessive Liver Retinol Stores in Male Mongolian Gerbils.The Journal of nutrition · 2020Article
- Vitamin A Requirements in Pregnancy and Lactation.Current developments in nutrition · 2020Review
- Eating Pattern and Nutritional Risks among People with Multiple Sclerosis Following a Modified Paleolithic Diet.Nutrients · 2020Article
- Addition of Vitamin A Intake Data during Compartmental Modeling of Retinol Kinetics in Theoretical Humans Leads to Accurate Prediction of Vitamin A Total Body Stores and Kinetic Parameters in Studies of Reasonable Duration.The Journal of nutrition · 2019Article
- Liver retinol estimated byExperimental biology and medicine (Maywood, N.J.) · 2019Article
- Inclusion of Vitamin A Intake Data Provides Improved Compartmental Model-Derived Estimates of Vitamin A Total Body Stores and Disposal Rate in Older Adults.The Journal of nutrition · 2019Article
- Total Adipose Retinol Concentrations Are Correlated with Total Liver Retinol Concentrations in Male Mongolian Gerbils, but Only Partially Explained by Chylomicron Deposition Assessed with Total α-Retinol.Current developments in nutrition · 2019Article
- Use of Stable Isotopes to Evaluate Bioefficacy of Provitamin A Carotenoids, Vitamin A Status, and Bioavailability of Iron and Zinc.Advances in nutrition (Bethesda, Md.) · 2018Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
Background: Retinol isotope dilution (RID) indirectly estimates vitamin A (VA) status. Multicompartment modeling of RID data is used to refine study designs and equations to calculate VA stores. Previous studies suggest that VA in slowly turning over pools is not traced if follow-up is not long enough; however, shorter RID studies are being investigated. Few long-term models have been published. Objective: We determined the effect of time on mathematical models of VA kinetics, model parameters, and outcomes. Methods: In this longitudinal study, women (mean ± SD age: 22 ± 3 y; n = 7) were given 2.0 µmol [14,15]-13C2-retinyl acetate. Blood samples were staggered from 4 h to 152 d; the fraction of dose in serum was modeled with compartmental models. Four model-time categories were created: full models that used all data (median: 137 d; range 97-152 d) and truncated shorter studies of 14, 27, and 52 d (range: 42-62 d). Outcomes included number of compartments to adequately model serum data, kinetic parameters, total traced VA mass, and time-to-dose equilibration. To gain insight into longer follow-up, an additional participant was given 17.5 µmol 13C4-VA, and data were modeled as long as enrichment was above baseline (5 y). Results: Longer follow-up times affected kinetic parameters and outcomes. Compared with the 14-d models, long-term full models required an additional compartment for adequate fit (14.3% compared with 100%; P = 0.0056) and had longer [median (quartile 1, quartile 3)] whole-body half-life [15.0 d (10.5, 72.6 d) compared with 135 d (115, 199 d); P = 0.0006], time-to-dose equilibration [3.40 d (3.14, 6.75 d) compared with 18.9 d (11.2, 25.7 d); P < 0.0001], and total traced mass [166 µmol VA (162, 252 µmol VA) compared with 476 µmol VA (290, 752 µmol VA); P = 0.0031]. Conclusions: Extended RID sampling alters numerous mathematically modeled, time-dependent outcomes in women. Length of study should be considered when using mathematical models for calculating total-body VA stores or kinetic parameters related to VA turnover. This study is registered at www.clinicaltrials.gov as NCT03248700.
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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.