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From accelerometer output to physical activity intensities in breast cancer patients.

Authors :
Sweegers MG
Buffart LM
Huijsmans RJ
Konings IR
van Zweeden AA
Brug J
Chinapaw MJM
Altenburg TM
Source :
Journal of science and medicine in sport [J Sci Med Sport] 2020 Feb; Vol. 23 (2), pp. 176-181. Date of Electronic Publication: 2019 Sep 07.
Publication Year :
2020

Abstract

Objectives: We aimed to investigate accelerometer output corresponding to physical activity intensity cut-points based on percentage of peak oxygen consumption (%VO <subscript>2</subscript> peak) and Metabolic Equivalent of Task (MET) value in women treated for breast cancer.<br />Design: Laboratory study.<br />Methods: Fifty female patients shortly after completion of treatment for breast cancer were included. VO <subscript>2</subscript> peak was determined during a cardiopulmonary exercise test. Subsequently, patients performed ten activities with different intensities while wearing an accelerometer on the right hip and a mobile oxycon to assess oxygen consumption. We studied the relationship between energy expenditure (expressed as %VO <subscript>2</subscript> peak and MET-value) and accelerometer output (in counts per minute (cpm)) with linear regression analyses. We determined accelerometer output corresponding to physical activity intensity cut-points (40% and 60%VO <subscript>2</subscript> peak; 3 and 6 MET) using regression equations.<br />Results: VO <subscript>2</subscript> peak was 22.4mL/kg/min (SD 5.2) and resting metabolic rate was 3.1mL/kg/min (SD 0.6). Accelerometer output corresponding to the cut-points for moderate (40% VO <subscript>2</subscript> peak) and vigorous intensity (60% VO <subscript>2</subscript> peak) were 1123 and 1911, respectively. The analyses based on MET-values resulted in accelerometer output of 1189cpm for the moderate (3 MET) and 2768 cpm for the vigorous intensity cut-point (6 MET).<br />Conclusions: Accelerometer outputs for moderate and vigorous intensity physical activity were lower than commonly used cut-points (i.e. 1952 and 5724 cpm), irrespective of the method used to express energy expenditure (%VO <subscript>2</subscript> peak versus MET-value). Thus, categorizing physical activity intensities based on general-population cut-points, may underestimate physical activity intensities for women treated for breast cancer.<br /> (Copyright © 2019 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1878-1861
Volume :
23
Issue :
2
Database :
MEDLINE
Journal :
Journal of science and medicine in sport
Publication Type :
Academic Journal
Accession number :
31537492
Full Text :
https://doi.org/10.1016/j.jsams.2019.09.001