Abstract
Purpose
The aim of this research was to provide convergent validity evidence for the use of the Godin-Shephard Leisure-Time Physical Activity Questionnaire (GSLTPAQ) to classify breast cancer survivors into active and insufficiently active categories.
Methods
Data were collected among a sample of breast cancer survivors (N = 199; mean age = 55 years) to examine the association between physical activity assessed with a GT3X triaxial accelerometer and the use of the GSLTPAQ’s coding system recently proposed by Godin (2011). Participants self-reported moderate and vigorous physical activity (MVPA) performed in a typical week on the GSLTPAQ and those with MVPA leisure score index ≥24 were classified as active.
Results
ANCOVA revealed that the adjusted mean [95 % CI] number of recorded MVPA minutes was higher for respondents classified as active (145.54 [127.26; 163.83]) compared to respondents classified as insufficiently active (86.99 [74.04; 99.94]). The GSLTPAQ and accelerometer classified 33.8 and 27.2 % of participants as active, respectively (agreement = 70.8 %). Sensitivity and specificity values were 75.3 and 58.5 %, respectively.
Conclusion
The GSLTPAQ can be used to classify cancer survivors into active and insufficiently active categories in reference to cancer survivors’ physical activity guidelines. However, it has greater capacity to correctly identify insufficiently active respondents.
Implications for Cancer Survivors
The use of the GSLTPAQ’s classification coding in oncology research could improve the quality of physical activity recommendations and interventions handed out to cancer survivors.
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Notes
In this article, physical activity refers to “any bodily movement produced by skeletal muscles that results in energy expenditure” (p.126; [1]). Leisure-time physical activity refers to any “[…] activity undertaken in the individual’s discretionary time that increases the total energy expenditure” (p. 12; [2]), whereas exercise is a planned purposeful activity specifically undertaken to promote fitness and health benefits [1], which is considered a subcategory of LTPA.
A Cohen’s d = .80 is qualitatively equivalent to a Pearson correlation coefficient = .50[43].
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Acknowledgments
This study is funded by a Canadian Institute Health Research operating grant [grant number 186128] awarded to the last author. Jason Lacombe is supported by the Psychosocial Oncology Research Training program and the Canadian Institutes of Health Research Master’s award.
Conflict of interest
The views expressed in the submitted article are those of the authors and not an official position of the institution or funder. Steve Amireault, Gaston Godin, Jason Lacombe, and Catherine M. Sabiston declare that they have no conflicts of interest.
Informed consent
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients for being included in the study.
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Amireault, S., Godin, G., Lacombe, J. et al. Validation of the Godin-Shephard Leisure-Time Physical Activity Questionnaire classification coding system using accelerometer assessment among breast cancer survivors. J Cancer Surviv 9, 532–540 (2015). https://doi.org/10.1007/s11764-015-0430-6
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DOI: https://doi.org/10.1007/s11764-015-0430-6