engleski

Agreement between Pa-Questionnaire and Multiple Sensor Monitor in Categorizing Physical Activity in Male Adolescents

It has been proposed that the physical activity (PA) assessment in public health studies should strive to classify individuals into quantiles according to the amount of PA1 and to detect portion of individuals at greater risk due to inactive lifestyle2. This study aimed to evaluate the potential of recall-PA- questionnaire to rank adolescents into quartiles according to duration of vigorous PA (VPA) and moderate PA (MPA) and to identify insufficiently physically active adolescents according to the current WHO guidelines (less than 60 min MVPA/day). A group of male adolescents (N=61 ; age 15, 6±0, 4, BMI=20, 9±3, 0) ; included in the CRO- PALS study3 were randomized to fulfil the School Health Action, Planning and Evaluation System questionnaire (SHAPES)4 and to wear multiple sensor monitor device (SenseWear ArmbandTM Pro3 ; SWA) for 7 consecutive days no more than three weeks after having fulfilled the questionnaire. Cross- sectional comparisons were applied to evaluate ability of the questionnaire to categorize adolescents against SWA in one ordinal variable quartiles of PA and three dichotomous variables sufficient activity (cut-off 60 min MVPA/day), low activity (last quartile of PA), high activity (first quartile of PA). The level of agreement between SHAPES and SWA was compared using Spearman's rank- correlation and Kappa statistics. Additionally, differences between questionnaire-based quartiles in objectively measured PA time were determined using one-way ANOVA with Bonferroni post-hoc comparisons. Results suggested that the questionnaire overreport duration of VPA in comparison to SWA. A fair correlation between SHAPES and SWA in ranking individuals based on time spent in VPA and MVPA has been detected (ρ=0, 40 and ρ=0, 33, respectively ; p<0, 01). No significant agreement was found between SHAPES and SWA in categorizing boys into quartiles of any PA- intensity. However, the highest and the lowest questionnaire-based quartiles differed in objectively measured duration of VPA (39, 1 [CI:22, 6–55, 6] vs. 13, 8 [CI:5, 8–21, 8] ; p=0.01) and MVPA (134, 2 [CI:108, 7–159, 6] vs. 86, 5 [CI:65, 0–108, 0] ; p=0.03). Results have further shown a fair agreement between SHAPES and SWA in categorizing boys as (in)sufficiently active given the current PA- recommendations (κ=0, 32, p=0, 01). Difference between questionnaire-based sufficiently active and insufficiently active boys in relative energy expenditure (13.60 vs. 9.01 kcal/kg/day ; p=0.05) also strengthen above finding. This study confirmed that the recall- questionnaire might be an appropriate tool to distinguish between the most active and the least active quartiles of male adolescents and to discriminate male adolescents at greater health-risk due to insufficient PA. It supports previous findings that subjective methods overreport the amount of PA in adolescents, which most likely leads to insufficient sensitivity of the questionnaire to rank adolescents into quartiles based on objective time spent in PA. Further research is needed to strengthen this finding and to confirm the hypothesis that the questionnaires can effectively categorize adolescents based on their PA level. This study was funded by the Croatian Science Foundation under the number 9926 (http://www.hrzz.hr/default.aspx? id=78&pid=9926&rok=2016-06). 1. Matthews CE et al. (2003) Am J Epidem 158(11), 1114–1122 ; 2. Dumith SC et al. (2012) Int J Epidem 40(3), 685–698 ; 3. CRO-PALS: http://www.kif.unizg.hr/en/cropals/about ; 4. Wong SL et al. (2006) Med Sci Sports Exerc 38(9), 1593–1600.

physical activity ; adolescence ; PA questionnaire ; Sense WearArmband

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