Abstract
Objectives
We aimed to investigate accelerometer output corresponding to physical activity intensity
cut-points based on percentage of peak oxygen consumption (%VO2peak) and Metabolic Equivalent of Task (MET) value in women treated for breast cancer.
Design
Laboratory study.
Methods
Fifty female patients shortly after completion of treatment for breast cancer were
included. VO2peak 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 %VO2peak 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%VO2peak; 3 and 6 MET) using regression equations.
Results
VO2peak was 22.4 mL/kg/min (SD 5.2) and resting metabolic rate was 3.1 mL/kg/min (SD 0.6). Accelerometer output corresponding to the cut-points for moderate
(40% VO2peak) and vigorous intensity (60% VO2peak) were 1123 and 1911, respectively. The analyses based on MET-values resulted
in accelerometer output of 1189 cpm for the moderate (3 MET) and 2768 cpm for the vigorous intensity cut-point (6
MET).
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 (%VO2peak 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.
Keywords
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Article info
Publication history
Published online: September 07, 2019
Accepted:
September 2,
2019
Received in revised form:
August 30,
2019
Received:
March 15,
2019
Identification
Copyright
© 2019 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
