Individual Variability in Waist Circumference and Body Weight in Response to Exercise

Purpose To determine the magnitude of exercise-induced individual variability for waist circumference (WC) and body weight change after accounting for biological variability and measurement error. Determinants of response variability were also considered. Methods Participants (53 ± 7.5 years) were 181 (61% women) adults with abdominal obesity randomized to: control; low amount, low intensity (LALI); high amount, low intensity (HALI); or high amount, high intensity exercise (HAHI) for 24 weeks. Unstructured physical activity was measured by accelerometer. The variability in response to exercise for WC and body weight (SDR) was isolated by subtracting the standard deviations for the change scores in the exercise group from that of the control group. Results The variability of response due to exercise (SDR) for change in WC was 3.1, -0.3 and 3.1 cm for LALI, HALI and HAHI groups, respectively. Corresponding values for body weight were 3.8, 2.0 and 3.5 kg for LALI, HALI and HAHI, respectively. The high amount exercise groups yielded the highest proportion of individuals with a clinically meaningful response. No variables predicted the response to exercise (p>0.05). Conclusions Substantial variability in response to standardized exercise was observed for change in both WC and body weight after accounting for the variability not attributed to exercise. Potential determinants of the interindividual variability in response to exercise remain unclear. Corresponding author: Robert Ross, PhD, R. Kin, FACSM, FAHA, School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON, Canada, Kingston, Ontario, Canada, K7L 3N6; E-mail: rossr@queensu.ca; Phone: (613) 533-6583 This study was supported by Canadian Institutes of Health Research (grant OHN-63277). Disclosure: The authors declare no conflict of interest. The results of the present study do not constitute endorsement by ACSM. The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. Accepted for Publication: 10 September 2018. © 2018 American College of Sports Medicine

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