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Cancer Causes & Control

, Volume 25, Issue 1, pp 133–140 | Cite as

A case–control study of lifetime light intensity physical activity and breast cancer risk

  • Lindsay C. Kobayashi
  • Ian Janssen
  • Harriet Richardson
  • Agnes S. Lai
  • John J. Spinelli
  • Kristan J. Aronson
Brief report

Abstract

Purpose

Physical activity reduces breast cancer risk, although most evidence is for activity in the moderate-to-vigorous intensity range. The effect of light intensity physical activity (LIPA) is unknown. We aimed to determine the association between self-reported lifetime LIPA and pre- and post-menopausal breast cancer risk. Our secondary objective was to analyze risk stratified by estrogen and progesterone tumor receptor status.

Methods

Data were from a case–control study of 1,110 incident breast cancer cases (388 pre-menopausal; 722 post-menopausal) and 1,172 controls (442 pre-menopausal; 730 post-menopausal) recruited at two Canadian sites. Lifetime leisure-time, household, and occupational physical activity and covariates were assessed by questionnaire. Mean minutes per day of LIPA for each of the age periods 12–17, 18–34, 35–49, ≥50, and the total lifetime were calculated. Odds ratios were calculated using unconditional logistic regression for overall breast cancer risk and using polytomous logistic regression for estrogen receptor (ER)/progesterone receptor (PR)-defined tumor subtypes and were adjusted for moderate-to-vigorous physical activity and other confounders.

Results

LIPA was not associated with breast cancer risk at any age period across the life course: odds ratio (OR) = 0.81; 95 % CI 0.53–1.24 for pre-menopausal women and OR = 0.87; 95 % CI 0.64–1.19 for post-menopausal women in the highest vs. lowest categories of total lifetime LIPA. No heterogeneity in risk by ER/PR tumor status was observed.

Conclusions

Our results suggest that light intensity physical activity is not associated with breast cancer risk reduction. This finding is important for physical activity recommendations for breast cancer prevention.

Keywords

Physical activity Breast cancer Women Case–control Menopausal status Prevention 

Notes

Acknowledgments

The MEBC study is funded by a grant from the Canadian Institutes of Health Research. The authors thank Dr. Chris Bajdik for his contributions to study design and conduct; Derrick Lee, Dr. Matt Parkinson, and Dr. Anne Grundy for their assistance with data management; and Dr. Christine Friedenreich for permission to adapt the study questionnaire. Lindsay Kobayashi was supported by an Ontario Graduate Scholarship from the Ontario Ministry of Training, Colleges, and Universities and a studentship from the Queen’s University Terry Fox Foundation Training Program in Transdisciplinary Cancer Research in Partnership with CIHR.

Supplementary material

10552_2013_312_MOESM1_ESM.doc (52 kb)
Supplementary material 1 (DOC 52 kb)
10552_2013_312_MOESM2_ESM.doc (60 kb)
Supplementary material 2 (DOC 59 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Lindsay C. Kobayashi
    • 1
    • 2
    • 3
  • Ian Janssen
    • 1
    • 4
  • Harriet Richardson
    • 1
    • 2
  • Agnes S. Lai
    • 5
  • John J. Spinelli
    • 5
  • Kristan J. Aronson
    • 1
    • 2
  1. 1.Department of Public Health SciencesQueen’s UniversityKingstonCanada
  2. 2.Division of Cancer Care and EpidemiologyQueen’s Cancer Research InstituteKingstonCanada
  3. 3.Department of Epidemiology and Public HealthUniversity College LondonLondonUK
  4. 4.School of Kinesiology and Health StudiesQueen’s UniversityKingstonCanada
  5. 5.Department of Cancer Control ResearchBritish Columbia Cancer AgencyVancouverCanada

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