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Physical activity more likely to prevent
breast cancer in certain groups
Newswise — Physically active women are 25
per cent less likely to get breast cancer,
but certain groups are more likely to see
these benefits than others, finds a review
of research published online ahead of print
in the British Journal of Sports Medicine.
The type of activity undertaken, at what
time in life and the woman’s body mass index
(BMI) will determine how protective the
activity is against the disease.
Lean women who play sport or undertake other
physically active things in their spare
time, especially if they have been through
the menopause, have the lowest risk of
breast cancer.
The researchers reviewed the literature and
analysed 62 studies looking at the impact of
physical activity on breast cancer risk.
They then examined the findings to find out
how breast cancer risk appeared to be
affected by type of activity, intensity of
activity, when in life the activity was
performed and other factors.
They found the most physically active women
were least likely to get breast cancer. All
types of activity reduced breast cancer risk
but recreational activity reduced the risk
more than physical activity undertaken as
part of a job or looking after the house.
Moderate and vigorous activity had equal
benefits.
Women who had undertaken a lot of physical
activity throughout their life had the
lowest risk of breast cancer, and activity
performed after the menopause had a greater
effect than that performed earlier in life.
Physical activity reduced breast cancer risk
in all women except the obese and had the
greatest impact in lean women (BMI <
22kg/m2)
Women who were mothers, had no family
history of breast cancer, were not white and
had oestrogen receptor negative tumours also
had a reduced risk of breast cancer.
The authors said the way in which physical
activity protected against breast cancer was
likely to be complex and may involve effects
on sex hormones, insulin-related factors,
the immune system and other hormone and
cellular pathways.
Click here to view the paper in full:
http://press.psprings.co.uk/bjsm/may/sm29132.pdf
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