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Journal of Cancer Survivorship
Published in: Journal of Cancer Survivorship 3/2019

01-06-2019 | Breast Cancer

Breast cancer survivors reduce accelerometer-measured sedentary time in an exercise intervention

Authors: Lauren S. Weiner, Michelle Takemoto, Suneeta Godbole, Sandahl H. Nelson, Loki Natarajan, Dorothy D. Sears, Sheri J. Hartman

Published in: Journal of Cancer Survivorship | Issue 3/2019

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Abstract

Purpose

Cancer survivors are highly sedentary and have low physical activity. How physical activity interventions impact sedentary behavior remains unclear. This secondary analysis examined changes in sedentary behavior among breast cancer survivors participating in a physical activity intervention that significantly increased moderate-to-vigorous physical activity (MVPA).

Methods

Insufficiently active breast cancer survivors were randomized to a 12-week physical activity intervention (exercise arm) or control arm. The intervention focused solely on increasing MVPA with no content targeting sedentary behavior. Total sedentary behavior, light physical activity (LPA), and MVPA were measured at baseline and 12 weeks (ActiGraph GT3X+ accelerometer). Separate linear mixed-effects models tested intervention effects on sedentary behavior, intervention effects on LPA, the relationship between change in MVPA and change in sedentary behavior, and potential moderators of intervention effects on sedentary behavior.

Results

The exercise arm had significantly greater reductions in sedentary behavior than the control arm (mean − 24.9 min/day (SD = 5.9) vs. − 4.8 min/day (SD = 5.9), b = − 20.1 (SE = 8.4), p = 0.02). Larger increases in MVPA were associated with larger decreases in sedentary behavior (b = − 1.9 (SE = 0.21), p < 0.001). Women farther out from surgery had significantly greater reductions in sedentary behavior than women closer to surgery (b = − 0.91 (SE = 0.5), p = 0.07). There was no significant group difference in change in LPA from baseline to 12 weeks (b = 5.64 (SE = 7.69), p = 0.48).

Conclusions

Breast cancer survivors in a physical activity intervention reduced total sedentary time in addition to increasing MVPA.

Implications for Cancer Survivors

Both increasing physical activity and reducing sedentary behavior are needed to promote optimal health in cancer survivors. These results show that MVPA and sedentary behavior could be successfully targeted together, particularly among longer-term cancer survivors.

Clinical trial registration

This study is registered at www.​ClinicalTrials.​gov (NCT 02332876).
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Metadata
Title
Breast cancer survivors reduce accelerometer-measured sedentary time in an exercise intervention
Authors
Lauren S. Weiner
Michelle Takemoto
Suneeta Godbole
Sandahl H. Nelson
Loki Natarajan
Dorothy D. Sears
Sheri J. Hartman
Publication date
01-06-2019
Publisher
Springer US
Published in
Journal of Cancer Survivorship / Issue 3/2019
Print ISSN: 1932-2259
Electronic ISSN: 1932-2267
DOI
https://doi.org/10.1007/s11764-019-00768-8

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