Journal article
Relative validity and reliability of a novel diet quality assessment tool for athletes: The Athlete Diet Index
British Journal of Nutrition, Vol.126(2), pp.307-319
2021
PMID: 33077018
Abstract
Diet quality indices are a practical, cost-effective method to evaluate dietary patterns, yet few have investigated diet quality in athletes. This study describes the relative validity and reliability of the recently developed Athlete Diet Index (ADI). Participants completed the electronic ADI on two occasions, 2 weeks apart, followed by a 4-d estimated food record (4-dFR). Relative validity was evaluated by directly comparing mean scores of the two administrations (mAdm) against scores derived from 4-dFR using Spearman’s rank correlation coefficient and Bland–Altman (B–A) plots. Construct validity was investigated by comparing mAdm scores and 4-dFR-derived nutrient intakes using Spearman’s coefficient and independent t test. Test–retest reliability was assessed using paired t test, intraclass correlation coefficients (ICC) and B–A plots. Sixty-eight elite athletes (18·8 (sd 4·2) years) from an Australian sporting institute completed the ADI on both occasions. Mean score was 84·1 (sd 15·2; range 42·5–114·0). The ADI had good reliability (ICC = 0·80, 95 % CI 0·69, 0·87; P < 0·001), and B–A plots (mean 1·9; level of agreement −17·8, 21·7) showed no indication of systematic bias (y = 4·57–0·03 × x) (95 % CI −0·2, 0·1; P = 0·70). Relative validity was evaluated in fifty athletes who completed all study phases. Comparison of mAdm scores with 4-dFR-derived scores was moderate (r s 0·69; P < 0·001) with no systematic bias between methods of measurement (y = 6·90–0·04 × x) (95 % CI −0·3, 0·2; P = 0·73). Higher scores were associated with higher absolute nutrient intake consistent with a healthy dietary pattern. The ADI is a reliable tool with moderate validity, demonstrating its potential for application to investigate the diet quality of athletes.
Details
- Title
- Relative validity and reliability of a novel diet quality assessment tool for athletes: The Athlete Diet Index
- Authors
- Louise Capling (Corresponding Author) - University of SydneyJanelle A Gifford (Author) - University of SydneyKathryn L Beck (Author) - Massey UniversityVictoria M Flood (Author) - University of SydneyFiona Halar (Author) - University of SydneyGary Slater (Author) - University of the Sunshine Coast, Queensland, School of Health and Sport Sciences - LegacyHelen T O'Connor (Author) - University of Sydney
- Publication details
- British Journal of Nutrition, Vol.126(2), pp.307-319
- Publisher
- Cambridge University Press
- DOI
- 10.1017/S000711452000416X
- ISSN
- 1475-2662
- PMID
- 33077018
- Organisation Unit
- School of Health and Behavioural Sciences - Legacy; School of Health and Sport Sciences - Legacy; University of the Sunshine Coast, Queensland; School of Health - Nutrition & Dietetics
- Language
- English
- Record Identifier
- 99482289302621
- Output Type
- Journal article
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- Nutrition & Dietetics
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