TY  - JOUR
AU  - Bonn, Stephanie Erika
AU  - Trolle Lagerros, Ylva
AU  - Christensen, Sara Elisabeth
AU  - Möller, Elisabeth
AU  - Wright, Antony
AU  - Sjölander, Arvid
AU  - Bälter, Katarina
PY  - 2012
DA  - 2012/02/15
TI  - Active-Q: Validation of the Web-Based Physical Activity Questionnaire Using Doubly Labeled Water
JO  - J Med Internet Res
SP  - e29
VL  - 14
IS  - 1
KW  - activity assessment
KW  - epidemiology
KW  - Internet
KW  - total energy expenditure
AB  - Background: Increased use of the Internet provides new opportunities for collecting data in large studies. The aim of our new Web-based questionnaire, Active-Q, is to assess total physical activity and inactivity in adults. Active-Q assesses habitual activity during the past year via questions in four different domains: (1) daily occupation, (2) transportation to and from daily occupation, (3) leisure time activities, and (4) sporting activities. Objective: The objective of our study is to validate Active-Q’s energy expenditure estimates using the doubly labeled water (DLW) method, and to assess the reproducibility of Active-Q by comparing the results of the questionnaire completed by the same group on two occasions. Methods: The validity and reproducibility of Active-Q were assessed in a group of 37 individuals, aged 20 to 65 years. Active-Q was distributed via email to the participants. The total energy expenditure of the participants was assessed using DLW for 11 consecutive days. Results: The median time to complete Active-Q was 6.1 minutes. The majority of participants (27/37, 73%) reported that the questionnaire was “easy” or “very easy” to answer. On average, Active-Q overestimated the total daily energy expenditure by 440 kJ compared with the DLW. The Spearman correlation between the two methods was r = 0.52 (P < .001). The intraclass correlation coefficient for total energy expenditure between the results of Active-Q completed on two occasions was 0.83 (95% CI 0.73-0.93). Conclusions: Active-Q is a valid and reproducible method of assessing total energy expenditure. It is also a user-friendly method and suitable for Web-based data collection in large epidemiological studies. 
SN  - 1438-8871
UR  - http://www.jmir.org/2012/1/e29/
UR  - https://doi.org/10.2196/jmir.1974
UR  - http://www.ncbi.nlm.nih.gov/pubmed/22356755
DO  - 10.2196/jmir.1974
ID  - info:doi/10.2196/jmir.1974
ER  -