Development, validity and reliability of a questionnaire designed to evaluate rapid weight loss patterns in judo players.
The aim of this study was to develop a questionnaire to evaluate rapid weight loss patterns of competitive judo players and to assess its validity and reliability. We evaluated the reliability (n=94), content validity (evaluation by 10 experts), discriminant validity (differences in scores between athletes with body weight below and above their weight class; n=100) and convergent validity (correlation with Restraint Scale; n=60). No item was considered unclear or ambiguous by more than 20% of the experts. The intraclass Coefficient Correlation was above 0.90 for all questions whose answers were parametric (P<0.001; n=94) and no significant differences were found between test and retest scores (n=94--Wilcoxon's signed rank test). Cronbach's alpha was 0.98 for scores obtained between test and retest. Non-numerical questions showed proportions of agreement >80%; Spearman's Correlation between the Restraint Scale and the Rapid Weight Loss Questionnaire was 0.62 (P<0.001; n=60). Athletes below their weight class (n=50) had a significantly lower score compared with athletes above the weight class (n=50; P<0.001--Mann-Whitney U test). In conclusion, the questionnaire showed good validity and reliability and could be used accurately to assess weight loss patterns of judo players.
Combat Sports and Martial Arts Research Group, Laboratory of Applied Nutrition, School of Physical Education and Sport, University of Sao Paulo, Av. Professor Mello Moraes, Cidade Universitaria, Sao Paulo-SP, Brazil. artioli@usp.br
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Artioli
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Scagliusi
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Kashiwagura
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Franchini
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Gualano
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Junior
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D016139:Martial Arts / Q000145:classification / Q000502:physiology*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D015431:Weight Loss