Cited by 111Cancer Risks and FactorsPhysical Activity and HealthGlobal Cancer Incidence and Screening

Influence of Physical Activity in Different Age and Life Periods on the Risk of Breast Cancer

Friedenreich, Christine M., Courneya, Kerry S., Bryant, Heather E.·2001·Epidemiology

Abstract

We conducted a population-based case-control study of 1,237 incident breast cancer cases and 1,241 controls in Alberta between 1995 and 1997 to examine the effect of physical activity performed at different ages and life periods on breast cancer risk. In this study, we measured all types of physical activity done throughout life with a questionnaire developed and tested specifically for this study. We found that breast cancer risk was most associated with a risk reduction for activity done later in life, particularly between menopause and the reference year, for which we observed an odds ratio of 0.70 (95% confidence interval = 0.52-0.95). We also stratified the study participants into four categories according to their patterns of physical activity performed before and after menopause. For the women who sustained physical activity throughout life vs those who were never active, we found an odds ratio of 0.58 (95% confidence interval = 0.41-0.83). This study suggests that sustained activity throughout life and particularly activity done later in life may have the most benefit in reducing breast cancer risk.

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Crossref · 10.1097/00001648-200111000-00005

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Authors
Friedenreich, C. M., Courneya, K. S., & Bryant, H. E.
Affiliations
University of Alberta (CA)
Corresponding author
Friedenreich, Christine M.
Venue
Epidemiology
Published
2001-11
Volume
12
Issue
6
Pages
604-612
ISSN
1044-3983 (ISSN-L)
OpenAlex
W1991418239
Cited by
111
References
44
Citations by year
2026: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 2 · 2015: 3 · 2014: 4 · 2013: 6 · 2012: 3
FWCI
4.80
Type
journal article
Language
en
Open access
closed
Locations
  • Epidemiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Risks and Factors
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Oncology › Global Cancer Incidence and Screening
Keywords
physical activity, breast cancer risk, life course epidemiology, menopause, sustained physical activity, cancer prevention
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Breast Neoplasms, Canada, Child, Female, Humans, Life Style, Menopause, Middle Aged, Surveys and Questionnaires, Risk Factors, Exercise, Odds Ratio, Case-Control Studies

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