Association between serum 25-hidroxyvitamin D concentrations and ultraviolet index in Portuguese older adults: a cross-sectional study

There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

Abstract

Background

The older population is a risk group for hypovitaminosis D. The Ultraviolet Index (UVI) can be an indicator of potential for cutaneous synthesis of vitamin D but physiological and other environmental factors also influence vitamin D synthesis and status. Knowledge about vitamin D status in Portuguese older adults is limited. This study aims to explore the association between Ultraviolet Index and serum 25-hidroxyvitamin D3 [25(OH)D] levels accounting for other potential influential factors.

Methods

A cross-sectional study was conducted between December 2015 and June 2016, in 1497 Portuguese older adults (≥ 65 years) within Nutrition UP 65 project. For each participant, serum 25(OH)D was determined and the mean UVI (mUVI) in the respective residence district was calculated for the previous 30 days. Stepwise linear regression analyses were conducted for the following periods of blood collection: between December and June, December and March and April and June. Standardized regression coefficients (Sβ) and 95% confidence intervals were calculated.

Results

The median 25(OH)D concentration was 35.9 nmol/L. The UVI was independently and positively associated with 25(OH)D in the models for December–June (Sβ = 0.244, 95% CI: 0.198; 0.291, P < 0.001) and April–June (Sβ = 0.295, 95% CI: 0.299; 0.362, P < 0.001) and independently and negatively associated in December–March period (Sβ = −0.149, 95% CI: -0.211; −0.087, P < 0.001).

Conclusions

In this sample with high vitamin D deficiency frequency, the UVI was a predictor of 25(OH)D levels but the direction of the association varied according to the blood collection period. Our results suggest that accounting for the time of year in future research regarding vitamin status and related public health recommendations may be relevant.

Electronic supplementary material

The online version of this article (10.1186/s12877-017-0644-8) contains supplementary material, which is available to authorized users.

Related collections

Most cited references 82

Record: found
Abstract: found
Article: not found

International physical activity questionnaire: 12-country reliability and validity.

CORA L. CRAIG, ALISON L. MARSHALL, MICHAEL SJ??STR??M … (2003)

Physical inactivity is a global concern, but diverse physical activity measures in use prevent international comparisons. The International Physical Activity Questionnaire (IPAQ) was developed as an instrument for cross-national monitoring of physical activity and inactivity. Between 1997 and 1998, an International Consensus Group developed four long and four short forms of the IPAQ instruments (administered by telephone interview or self-administration, with two alternate reference periods, either the "last 7 d" or a "usual week" of recalled physical activity). During 2000, 14 centers from 12 countries collected reliability and/or validity data on at least two of the eight IPAQ instruments. Test-retest repeatability was assessed within the same week. Concurrent (inter-method) validity was assessed at the same administration, and criterion IPAQ validity was assessed against the CSA (now MTI) accelerometer. Spearman's correlation coefficients are reported, based on the total reported physical activity. Overall, the IPAQ questionnaires produced repeatable data (Spearman's rho clustered around 0.8), with comparable data from short and long forms. Criterion validity had a median rho of about 0.30, which was comparable to most other self-report validation studies. The "usual week" and "last 7 d" reference periods performed similarly, and the reliability of telephone administration was similar to the self-administered mode. The IPAQ instruments have acceptable measurement properties, at least as good as other established self-reports. Considering the diverse samples in this study, IPAQ has reasonable measurement properties for monitoring population levels of physical activity among 18- to 65-yr-old adults in diverse settings. The short IPAQ form "last 7 d recall" is recommended for national monitoring and the long form for research requiring more detailed assessment.

0 comments Cited 3194 times – based on 0 reviews      Review now

Bookmark

Record: found
Abstract: not found
Article: not found

Frailty in Older Adults: Evidence for a Phenotype

L P Fried, C Tangen, J Walston … (2001)

0 comments Cited 2968 times – based on 0 reviews      Review now

Bookmark

Record: found
Abstract: found
Article: not found

Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline.

Michael Holick, Neil C Binkley, Heike Bischoff-Ferrari … (2011)

The objective was to provide guidelines to clinicians for the evaluation, treatment, and prevention of vitamin D deficiency with an emphasis on the care of patients who are at risk for deficiency. The Task Force was composed of a Chair, six additional experts, and a methodologist. The Task Force received no corporate funding or remuneration. Consensus was guided by systematic reviews of evidence and discussions during several conference calls and e-mail communications. The draft prepared by the Task Force was reviewed successively by The Endocrine Society's Clinical Guidelines Subcommittee, Clinical Affairs Core Committee, and cosponsoring associations, and it was posted on The Endocrine Society web site for member review. At each stage of review, the Task Force received written comments and incorporated needed changes. Considering that vitamin D deficiency is very common in all age groups and that few foods contain vitamin D, the Task Force recommended supplementation at suggested daily intake and tolerable upper limit levels, depending on age and clinical circumstances. The Task Force also suggested the measurement of serum 25-hydroxyvitamin D level by a reliable assay as the initial diagnostic test in patients at risk for deficiency. Treatment with either vitamin D(2) or vitamin D(3) was recommended for deficient patients. At the present time, there is not sufficient evidence to recommend screening individuals who are not at risk for deficiency or to prescribe vitamin D to attain the noncalcemic benefit for cardiovascular protection.

0 comments Cited 1448 times – based on 0 reviews      Review now

Bookmark

All references

Author and article information

Contributors

Sofia Cardoso: up201507705@fcna.up.pt

Alejandro Santos: alejandrosantos@fcna.up.pt

Rita S. Guerra: ritaguerra@fcna.up.pt

Ana S. Sousa: asousa@fcna.up.pt

Patrícia Padrão: patriciapadrao@fcna.up.pt

Pedro Moreira: pedromoreira@fcna.up.pt

Cláudia Afonso: claudiaafonso@fcna.up.pt

Teresa F. Amaral: tamaral@fcna.up.pt

Nuno Borges:

ORCID: http://orcid.org/0000-0001-6357-0615

nunoborges@fcna.up.pt

Journal

Journal ID (nlm-ta): BMC Geriatr

Journal ID (iso-abbrev): BMC Geriatr

Title: BMC Geriatrics

Publisher: BioMed Central (London )

ISSN (Electronic): 1471-2318

Publication date (Electronic): 31 October 2017

Publication date PMC-release: 31 October 2017

Publication date Collection: 2017

Volume: 17

Electronic Location Identifier: 256

Affiliations

[1 ]ISNI 0000 0001 1503 7226, GRID grid.5808.5, Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto Rua Dr. Roberto Frias, ; 4200-465 Porto, Portugal

[2 ]I3S-Instituto de Investigação e Inovação em Saúde, R. Alfredo Allen, 4200-135 Porto, Portugal

[3 ]ISNI 0000 0001 1503 7226, GRID grid.5808.5, UISPA, LAETA-INEGI, Faculdade de Engenharia, , Universidade do Porto, ; Porto, Portugal

[4 ]ISNI 0000 0001 1503 7226, GRID grid.5808.5, EPIUnit, Instituto de Saúde Pública, , Universidade do Porto, ; Rua das Taipas, n° 135, 4050-600 Porto, Portugal

[5 ]ISNI 0000 0001 1503 7226, GRID grid.5808.5, Centro de Investigação em Atividade Física, Saúde e Lazer, , Universidade do Porto, ; R. Dr. Plácido da Costa 91, 4200-450 Porto, Portugal

[6 ]CINTESIS - Centre for Health Technology and Services Research, Rua Dr. Plácido da Costa, 4200-450 Porto, Portugal

Author information

Nuno Borges http://orcid.org/0000-0001-6357-0615

Article

Publisher ID: 644

DOI: 10.1186/s12877-017-0644-8

PMC ID: 5664428

PubMed ID: 29089044

SO-VID: d2a298d8-96a5-4a45-b253-65aff84daad4

License:

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

History

Date received : 21 April 2017

Date accepted : 16 October 2017

Funding

Funded by: EEA Grants (PT)

Award ID: 40 NU 05

Custom metadata

ScienceOpen disciplines: Geriatric medicine

Keywords: vitamin d,vitamin d deficiency,older adults,cutaneous synthesis,25-hydroxyvitamin d3,ultraviolet index

Data availability:

ScienceOpen disciplines: Geriatric medicine

Keywords: vitamin d, vitamin d deficiency, older adults, cutaneous synthesis, 25-hydroxyvitamin d3, ultraviolet index

Association between serum 25-hidroxyvitamin D concentrations and ultraviolet index in Portuguese older adults: a cross-sectional study

Read this article at

Abstract

Background

Methods

Results

Conclusions

Electronic supplementary material

Related collections

Hearing Loss and Restoration

Most cited references 82

International physical activity questionnaire: 12-country reliability and validity.

Frailty in Older Adults: Evidence for a Phenotype

Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline.

Author and article information

Contributors

Journal

Affiliations

Author information

Article

History

Funding

Categories

Custom metadata

Comments

Comment on this article

Similar content 338

Cited by 7

Most referenced authors 1,215