Influencing Factors on the Overestimation of Self-Reported Physical Activity: A Cross-Sectional Analysis of Low Back Pain Patients and Healthy Controls.
Introduction. The aim of the present study was to determine the closeness of agreement between a self-reported and an objective measure of physical activity in low back pain patients and healthy controls. Beyond, influencing factors on overestimation were identified. Methods. 27 low back pain patients and 53 healthy controls wore an accelerometer (objective measure) for seven consecutive days and answered a questionnaire on physical activity (self-report) over the same period of time. Differences between self-reported and objective data were tested by Wilcoxon test. Bland-Altman analysis was conducted for describing the closeness of agreement. Linear regression models were calculated to identify the influence of age, sex, and body mass index on the overestimation by self-report. Results. Participants overestimated self-reported moderate activity in average by 42 min/day (p = 0.003) and vigorous activity by 39 min/day (p < 0.001). Self-reported sedentary time was underestimated by 122 min/day (p < 0.001). No individual-related variables influenced the overestimation of physical activity. Low back pain patients were more likely to underestimate sedentary time compared to healthy controls. Discussion. In rehabilitation and health promotion, the application-oriented measurement of physical activity remains a challenge. The present results contradict other studies that had identified an influence of age, sex, and body mass index on the overestimation of physical activity.
IST University of Applied Sciences, Erkrather Straße 220 a-c, 40233 Düsseldorf, Germany; Institute of Health Promotion and Clinical Movement Science, German Sport University Cologne, Am Sportpark Muengersdorf 6, 50933 Cologne, Germany.
Andrea
A
Schaller
Institute of Health Promotion and Clinical Movement Science, German Sport University Cologne, Am Sportpark Muengersdorf 6, 50933 Cologne, Germany.
Kevin
K
Rudolf
Institute of Health Promotion and Clinical Movement Science, German Sport University Cologne, Am Sportpark Muengersdorf 6, 50933 Cologne, Germany.
Lea
L
Dejonghe
Institute of Health Promotion and Clinical Movement Science, German Sport University Cologne, Am Sportpark Muengersdorf 6, 50933 Cologne, Germany.
Christopher
C
Grieben
Center for Health and Physical Activity, German Sport University Cologne, Am Sportpark Muengersdorf 6, 50933 Cologne, Germany.
Ingo
I
Froboese
D056044:Actigraphy / Q000706:statistics & numerical data; D000203:Activities of Daily Living / Q000523:psychology*; D000328:Adult; D017677:Age Distribution; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D059026:Diagnostic Self Evaluation; D015444:Exercise / Q000523:psychology*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology*; D008297:Male; D018670:Monitoring, Ambulatory / Q000706:statistics & numerical data; D015995:Prevalence; D015203:Reproducibility of Results; D057566:Self Report / Q000706:statistics & numerical data*; D012680:Sensitivity and Specificity; D017678:Sex Distribution