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Physical activity and breast cancer risk: impact of timing, type and dose of activity and population subgroup effects.
Br J Sports Med 2008; 42(8):636-47BJ

Abstract

OBJECTIVE

To review (1) the epidemiological literature on physical activity and the risk of breast cancer, examining the effect of the different parameters of activity and effect modification within different population subgroups; and (2) the biological mechanisms whereby physical activity may influence the risk of breast cancer.

METHODS

A review of all published literature to September 2007 was conducted using online databases; 34 case-control and 28 cohort studies were included. The impact of the different parameters of physical activity on the association between activity and the risk of breast cancer was examined by considering the type of activity performed, the timing of activity over the life course and the intensity of activity. Effect modification of this association by menopausal status, body mass index (BMI), racial group, family history of breast cancer, hormone receptor status, energy intake and parity were also considered.

RESULTS

Evidence for a risk reduction associated with increased physical activity was found in 47 (76%) of 62 studies included in this review with an average risk decrease of 25-30%. A dose-response effect existed in 28 of 33 studies. Stronger decreases in risk were observed for recreational activity, lifetime or later life activity, vigorous activity, among postmenopausal women, women with normal BMI, non-white racial groups, those with hormone receptor negative tumours, women without a family history of breast cancer and parous women.

CONCLUSIONS

The effect of physical activity on the risk of breast cancer is stronger in specific population subgroups and for certain parameters of activity that need to be further explored in future intervention trials.

Authors+Show Affiliations

Division of Population Health and Information, Alberta Cancer Board, 1331 29 St NW, Calgary, Alberta, Canada. chrisf@cancerboard.ab.caNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

18487249

Citation

Friedenreich, C M., and A E. Cust. "Physical Activity and Breast Cancer Risk: Impact of Timing, Type and Dose of Activity and Population Subgroup Effects." British Journal of Sports Medicine, vol. 42, no. 8, 2008, pp. 636-47.
Friedenreich CM, Cust AE. Physical activity and breast cancer risk: impact of timing, type and dose of activity and population subgroup effects. Br J Sports Med. 2008;42(8):636-47.
Friedenreich, C. M., & Cust, A. E. (2008). Physical activity and breast cancer risk: impact of timing, type and dose of activity and population subgroup effects. British Journal of Sports Medicine, 42(8), pp. 636-47. doi:10.1136/bjsm.2006.029132.
Friedenreich CM, Cust AE. Physical Activity and Breast Cancer Risk: Impact of Timing, Type and Dose of Activity and Population Subgroup Effects. Br J Sports Med. 2008;42(8):636-47. PubMed PMID: 18487249.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Physical activity and breast cancer risk: impact of timing, type and dose of activity and population subgroup effects. AU - Friedenreich,C M, AU - Cust,A E, Y1 - 2008/05/16/ PY - 2008/5/20/pubmed PY - 2008/8/30/medline PY - 2008/5/20/entrez SP - 636 EP - 47 JF - British journal of sports medicine JO - Br J Sports Med VL - 42 IS - 8 N2 - OBJECTIVE: To review (1) the epidemiological literature on physical activity and the risk of breast cancer, examining the effect of the different parameters of activity and effect modification within different population subgroups; and (2) the biological mechanisms whereby physical activity may influence the risk of breast cancer. METHODS: A review of all published literature to September 2007 was conducted using online databases; 34 case-control and 28 cohort studies were included. The impact of the different parameters of physical activity on the association between activity and the risk of breast cancer was examined by considering the type of activity performed, the timing of activity over the life course and the intensity of activity. Effect modification of this association by menopausal status, body mass index (BMI), racial group, family history of breast cancer, hormone receptor status, energy intake and parity were also considered. RESULTS: Evidence for a risk reduction associated with increased physical activity was found in 47 (76%) of 62 studies included in this review with an average risk decrease of 25-30%. A dose-response effect existed in 28 of 33 studies. Stronger decreases in risk were observed for recreational activity, lifetime or later life activity, vigorous activity, among postmenopausal women, women with normal BMI, non-white racial groups, those with hormone receptor negative tumours, women without a family history of breast cancer and parous women. CONCLUSIONS: The effect of physical activity on the risk of breast cancer is stronger in specific population subgroups and for certain parameters of activity that need to be further explored in future intervention trials. SN - 1473-0480 UR - https://www.unboundmedicine.com/medline/citation/18487249/Physical_activity_and_breast_cancer_risk:_impact_of_timing_type_and_dose_of_activity_and_population_subgroup_effects_ L2 - http://bjsm.bmj.com/cgi/pmidlookup?view=long&pmid=18487249 DB - PRIME DP - Unbound Medicine ER -