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Risiko
kanker payudara pascamenopause menurun secara cepat setelah memulai aktivitas
fisik secara teratur
Wanita
postmenopause dalam empat tahun terakhir telah lakukan aktivitas fisik secara
teratur yang setara dengan setidaknya empat jam berjalan per minggu memiliki
risiko lebih rendah untuk kanker payudara invasif dibandingkan dengan wanita
yang lakukan kurang selama empat tahun, menurut data baru.................
Postmenopausal breast cancer risk decreases rapidly after starting
regular physical activity
Date:
August 11,
2014
Source:
American Association for Cancer
Research
Summary:
Postmenopausal women who in the past
four years had undertaken regular physical activity equivalent to at least four
hours of walking per week had a lower risk for invasive breast cancer compared
with women who exercised less during those four years, according to new data.
..........................................
Postmenopausal women who in the past four years had
undertaken regular physical activity equivalent to at least four hours of
walking per week had a lower risk for invasive breast cancer compared with
women who exercised less during those four years, according to data published
in Cancer Epidemiology, Biomarkers &
Prevention, a journal of the American Association for Cancer
Research.
"Twelve
MET-h [metabolic equivalent task-hours] per week corresponds to walking four
hours per week or cycling or engaging in other sports two hours per week and it
is consistent with the World Cancer Research Fund recommendations of walking at
least 30 minutes daily," said Agnès Fournier, PhD, a researcher in the
Centre for Research in Epidemiology and Population Health at the Institut Gustave
Roussy in Villejuif, France. "So, our study shows that it is not necessary
to engage in vigorous or very frequent activities; even walking 30 minutes per
day is beneficial."
Postmenopausal
women who in the previous four years had undertaken 12 or more MET-h of
physical activity each week had a 10 percent decreased risk of invasive breast
cancer compared with women who were less active. Women who undertook this level
of physical activity between five and nine years earlier but were less active
in the four years prior to the final data collection did not have a decreased
risk for invasive breast cancer.
"Physical
activity is thought to decrease a woman's risk for breast cancer after
menopause," said Fournier. "However, it was not clear how rapidly
this association is observed after regular physical activity is begun or for
how long it lasts after regular exercise stops.
"Our
study answers these questions," Fournier continued. "We found that
recreational physical activity, even of modest intensity, seemed to have a
rapid impact on breast cancer risk. However, the decreased breast cancer risk
we found associated with physical activity was attenuated when activity
stopped. As a result, postmenopausal women who exercise should be encouraged to
continue and those who do not exercise should consider starting because their
risk of breast cancer may decrease rapidly."
Fournier and
colleagues analyzed data obtained from biennial questionnaires completed by
59,308 postmenopausal women who were enrolled in E3N, the French component of
the European Prospective Investigation Into Cancer and Nutrition (EPIC) study.
The mean duration of follow-up was 8.5 years, during which time, 2,155 of the
women were diagnosed with a first primary invasive breast cancer.
The total
amount of self-reported recreational physical activity was calculated in MET-h
per week. The breast cancer risk-reducing effects of 12 or more MET-h per week
of recreational physical activity were independent of body mass index, weight
gain, waist circumference, and the level of activity from five to nine years
earlier.
Story
Source:
The above
story is based on materials provided by American Association for Cancer Research. Note: Materials may be edited
for content and length.
Journal
Reference:
- A. Fournier, G. Dos Santos, G. Guillas, J. Bertsch, M. Duclos, M.-C. Boutron-Ruault, F. Clavel-Chapelon, S. Mesrine. Recent Recreational Physical Activity and Breast Cancer Risk in Postmenopausal Women in the E3N Cohort. Cancer Epidemiology Biomarkers & Prevention, 2014; DOI: 10.1158/1055-9965.EPI-14-0150