Development and Validation of a Food-Frequency Questionnaire to Assess Short-Term Antioxidant Intake in Athletes

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dc.contributor.author Braakhuis, Andrea en
dc.contributor.author Hopkins, WG en
dc.contributor.author Lowe, T en
dc.contributor.author Rush, E en
dc.date.accessioned 2013-10-10T01:04:25Z en
dc.date.issued 2011-04 en
dc.identifier.citation International Journal of Sport Nutrition and Exercise Metabolism 21(2):105-112 2011 en
dc.identifier.issn 1526-484X en
dc.identifier.uri http://hdl.handle.net/2292/20904 en
dc.description.abstract A quantitative food-frequency questionnaire (FFQ) was developed to determine antioxidant intake in athletes. The questionnaire will be valuable for researchers wishing to standardize antioxidant intake or simply document habitual intake during an intervention trial. One hundred thirteen athletes participated in the validity study, of whom 96 completed the questionnaire and blood test, 81 completed the 7-d food diary and questionnaire, and 63 completed the 7-d food diary and blood test. Validity was investigated by comparing total and food-group antioxidant intakes from the questionnaire with those from a subsequent 7-d food diary. Measures of construct validity were determined by comparing a biomarker of antioxidant capacity (ferric-reducing ability of plasma) in a blood sample with antioxidant intakes from the questionnaire and diary. The correlation between the diary and questionnaire energy-adjusted estimates of total antioxidant intake was modest (.38; 90% confidence limits, ± .14); the correlation was highest for antioxidants from cereals (.55; ± .11), which contributed the greatest proportion (31%) of the total antioxidant intake. Correlations were also high for coffee and tea (.51; ± .15) and moderate for vegetables (.34; ± .16) and fruit (.31; ± .16). The correlation of the plasma biomarker with the questionnaire estimate was small (.28; ± .15), but the correlation with the diary estimate was inconsequential (-.03; ± .15). One-week test-retest reliability of the questionnaire's estimates of antioxidant intake in 20 participants was high (.83; ± .16). In conclusion, the FFQ is less labor intensive for participants and researchers than a 7-d diary and appears to be at least as trustworthy for estimating antioxidant intake. en
dc.relation.ispartofseries International Journal of Sport Nutrition and Exercise Metabolism en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://journals.humankinetics.com/submission-guidelines-for-IJSNEM http://journals.humankinetics.com/AfcStyle/DocumentDownload.cfm?DType=DocumentItem&Document=IJSNEMCopyright%2Epdf http://www.sherpa.ac.uk/romeo/issn/1526-484X/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Development and Validation of a Food-Frequency Questionnaire to Assess Short-Term Antioxidant Intake in Athletes en
dc.type Journal Article en
pubs.issue 2 en
pubs.begin-page 105 en
pubs.volume 21 en
dc.identifier.pmid 21558572 en
pubs.author-url http://www.ncbi.nlm.nih.gov/pubmed/21558572 en
pubs.end-page 112 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 381110 en
pubs.org-id Medical and Health Sciences en
pubs.org-id Medical Sciences en
pubs.org-id Nutrition en
dc.identifier.eissn 1543-2742 en
pubs.record-created-at-source-date 2013-06-17 en
pubs.dimensions-id 21558572 en


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