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aim of this study was to determine the validity and reliability of
3 physical activity questionnaires in Greek high school children.
Forty children participated in the study aged M = 13.73 (SD 0.8 years).
The validation study was conducted by comparing an accelerometer (MTI/CSA
Model 7164) to 3 questionnaires: a) Three-day Physical Activity Record
(3DPAR), b) Four by One-Day Recall Physical Activity Questionnaire
(4BY1RPAQ) and c) Physical Activity and Life Style Questionnaire (PALQ).
Validity of the 3 self-report questionnaires was assessed against
the MTI/CSA accelerometer by comparing the scores obtained by each
instrument on the first week of measurement. Reliability was assessed
with two consecutive measurements performed two weeks apart. The measures
of reliability were assessed by Intra Class Correlation, Typical Error
and Limits of Agreement. A two-way ANOVA for repeated measures was
performed. Repeated measures were week and day; in order to determine
differences between the two scores obtained with the two measurements
for MTI/CSA, 3DPAR and 4BY1RPAQ. A paired Student's t-test was performed
for the two scores obtained with the PALQ. Post-hoc multiple comparisons
were performed using the Bonferroni test. Significance for all parts
of the analysis was determined at an alpha level of p < 0.05. A
paired Student's t-test was performed for the two scores obtained
with the PALQ. Results of this study indicated that reliability measured
by intra class correlations (ICC) were for MTI/CSA (ICC = 0.52, p
< 0.05), 3DPAR (ICC = 0.97, p < 0.01), 4BY1RPAQ (ICC = 0.70,
p < 0.01), and PALQ (ICC = 0.52, p < 0.01). Significant Pearson
product moment correlation coefficients (r) were observed between
MTI/CSA and the other instruments, as a measure of validity: 3DPAR
(r = 0.63, p < 0.01), 4BY1RPAQ (r = 0.62, p < 0.01), and PALQ
(r = 0.53, p < 0.01). The reliability of the four instruments used
in this study was acceptable. Validity correlations were also significant
for the three self-report instruments used in this study.
KEY
WORDS: Physical activity, activity monitors, energy expenditure,
children, validity, reliability.
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