TY - JOUR
T1 - Validity of physical activity and cardiorespiratory fitness in the Danish cohort 'Diet, Cancer and Health - Next Generations'
AU - Lerche, Lene
AU - Olsen, Anja
AU - Petersen, Kristina Elin Nielsen
AU - Rostgaard-Hansen, Agnetha Linn
AU - Dragsted, Lars Ove
AU - Nordsborg, Nikolai Baastrup
AU - Tjønneland, Anne
AU - Halkjær, Jytte
N1 - CURIS 2017 NEXS 108
PY - 2017/12
Y1 - 2017/12
N2 - Valid assessments of physical activity (PA) and cardiorespiratory fitness (CRF) are essential in epidemiological studies to define dose-response relationship for formulating thorough recommendations of an appropriate pattern of PA to maintain good health. The aim of this study was to validate the Danish step test, the physical activity questionnaire Active-Q, and self-rated fitness against directly measured maximal oxygen uptake (VO2max). A population-based subsample (n=125) was included from the “Diet, Cancer and Health-Next Generations” (DCH-NG) cohort which is under establishment. Validity coefficients, which express the correlation between measured and “true” exposure, were calculated, and misclassification across categories was evaluated. The validity of the Danish step test was moderate (women: r=.66, and men: r=.56); however, men were systematically underestimated (43% misclassification). When validating the questionnaire-derived measures of PA, leisure-time physical activity was not correlated with VO2max. Positive correlations were found for sports overall, but these were only significant for men: total hours per week of sports (r=.26), MET-hours per week of sports (r=.28) and vigorous sports (0.28) alone were positively correlated with VO2max. Finally, the percentage of misclassification was low for self-rated fitness (women: 9% and men: 13%). Thus, self-rated fitness was found to be a superior method to the Danish step test, as well as being less cost prohibitive and more practical than the VO2max method. Finally, even if correlations were low, they support the potential for questionnaire outcomes, particularly sports, vigorous sports, and self-rated fitness to be used to estimate CRF.
AB - Valid assessments of physical activity (PA) and cardiorespiratory fitness (CRF) are essential in epidemiological studies to define dose-response relationship for formulating thorough recommendations of an appropriate pattern of PA to maintain good health. The aim of this study was to validate the Danish step test, the physical activity questionnaire Active-Q, and self-rated fitness against directly measured maximal oxygen uptake (VO2max). A population-based subsample (n=125) was included from the “Diet, Cancer and Health-Next Generations” (DCH-NG) cohort which is under establishment. Validity coefficients, which express the correlation between measured and “true” exposure, were calculated, and misclassification across categories was evaluated. The validity of the Danish step test was moderate (women: r=.66, and men: r=.56); however, men were systematically underestimated (43% misclassification). When validating the questionnaire-derived measures of PA, leisure-time physical activity was not correlated with VO2max. Positive correlations were found for sports overall, but these were only significant for men: total hours per week of sports (r=.26), MET-hours per week of sports (r=.28) and vigorous sports (0.28) alone were positively correlated with VO2max. Finally, the percentage of misclassification was low for self-rated fitness (women: 9% and men: 13%). Thus, self-rated fitness was found to be a superior method to the Danish step test, as well as being less cost prohibitive and more practical than the VO2max method. Finally, even if correlations were low, they support the potential for questionnaire outcomes, particularly sports, vigorous sports, and self-rated fitness to be used to estimate CRF.
KW - Validation
KW - Fitness test
KW - Self-reported physical activity
KW - Maximal oxygen uptake
KW - cardiorespiratory fitness
KW - Epidemiology
U2 - 10.1111/sms.12873
DO - 10.1111/sms.12873
M3 - Journal article
C2 - 28267247
SN - 0905-7188
VL - 27
SP - 1864
EP - 1872
JO - Scandinavian Journal of Medicine & Science in Sports
JF - Scandinavian Journal of Medicine & Science in Sports
IS - 12
ER -
