Linda Trinh1, Robert W Motl2, Sarah A Roberts3, Trisha Gibbons3, Edward McAuley3. 1. Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON. 2. Department of Physical Therapy, The University of Alabama at Birmingham, Birmingham, Alabama. 3. Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, Illinois.
Abstract
OBJECTIVE: To examine the association between accelerometer activity counts and energy expenditure during walking in breast cancer survivors (BCS) compared with age-matched healthy controls, and differences in moderate-to-vigorous physical activity (MVPA) cut-points. METHODS: Using a case-control design, 19 BCS and 19 age-matched women completed 6 min of resting energy expenditure and 6-min periods of treadmill walking in Midwestern United States. Accelerometers and an open-circuit spirometry system were used to measure activity counts and energy expenditure (VO2 ). A mixed-factor analysis of variance was conducted on activity counts and VO2 . Independent samples t tests compared the magnitude of associations between groups. RESULTS: There were group by speed interactions on energy expenditure (p < 0.001) and counts (p < 0.001). The linear association did not differ between BCS and controls for the R2 (p = 0.62) nor the slope (p = 0.43), but there was a difference in the intercept (p = 0.01). This resulted in different MVPA cut-points between groups: 1,439 ± 761 counts·min-1 in BCS and 1,937 ± 639 counts·min-1 in controls. CONCLUSION: The findings support the use of different cut-points to quantify time spent in MVPA for BCS. Application of these cut-points is warranted to accurately assess physical activity (PA) patterns for better prescription and health outcomes in PA programmes for BCS.
OBJECTIVE: To examine the association between accelerometer activity counts and energy expenditure during walking in breast cancer survivors (BCS) compared with age-matched healthy controls, and differences in moderate-to-vigorous physical activity (MVPA) cut-points. METHODS: Using a case-control design, 19 BCS and 19 age-matched women completed 6 min of resting energy expenditure and 6-min periods of treadmill walking in Midwestern United States. Accelerometers and an open-circuit spirometry system were used to measure activity counts and energy expenditure (VO2 ). A mixed-factor analysis of variance was conducted on activity counts and VO2 . Independent samples t tests compared the magnitude of associations between groups. RESULTS: There were group by speed interactions on energy expenditure (p < 0.001) and counts (p < 0.001). The linear association did not differ between BCS and controls for the R2 (p = 0.62) nor the slope (p = 0.43), but there was a difference in the intercept (p = 0.01). This resulted in different MVPA cut-points between groups: 1,439 ± 761 counts·min-1 in BCS and 1,937 ± 639 counts·min-1 in controls. CONCLUSION: The findings support the use of different cut-points to quantify time spent in MVPA for BCS. Application of these cut-points is warranted to accurately assess physical activity (PA) patterns for better prescription and health outcomes in PA programmes for BCS.
Authors: Brenda Jeng; Katie L J Cederberg; Byron Lai; Jeffer E Sasaki; Marcas M Bamman; Robert W Motl Journal: PLoS One Date: 2020-11-11 Impact factor: 3.240
Authors: Tracy E Crane; Meghan B Skiba; Austin Miller; David O Garcia; Cynthia A Thomson Journal: JMIR Mhealth Uhealth Date: 2020-09-24 Impact factor: 4.773