Minnesota Leisure Time Activity Questionnaire and Doubly Labeled Water in Adolescents

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Abstract
Re Time Physical Activity Questionnaire (MLTPAQ) with total energy expenditure (TEE) measured by doubly labeled water (DLW), and to present and examine the validity of an extended version of the MLTPAQ with additional questions about inactivity during leisure time (eMLTPAQ), in a sample of Swedish 15-yr-old adolescents. Methods Thirty-five 15-yr-old adolescents were interviewed using the eMLTPAQ. In addition to anthropometry, indirect calorimetry was measured to assess basal metabolic rate, and TEE was assessed by the DLW method over a 14-d period. Results Energy expenditure calculated from MLTPAQ correlated well with TEEDLW (r = 0.49, P < 0.01), and the correlation increased when including questions about inactivity (r = 0.73, P < 0.01). However, eMLTPAQ underestimated TEE in 34 of the 35 students, with a mean difference between the methods of 2.8 MJ·d−1 (95% limits of agreement: −0.1 to 5.6 MJ·d−1), which mainly was explained by a relative high intensity in the time which remained unreported. Conclusion eMLTPAQ is valid in ranking adolescents energy expenditure and in describing patterns of leisure time physical activities....