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The researchers warned: "Intolerable
will be experienced at much
scales and for longer
, affecting far more people than previously thought." They said the over-60s are at a higher
because of three physical factors — they sweat
, their hearts have to work harder in the heat, and their blood vessels expand more
. These three things limit the
of the body to cool itself. A director at the charity Age UK said she found the
in the study alarming. She said: "This study means there's now no denying that
heat poses a very real health threat to our older population." Elderly people in low-income countries are
to be at highest risk.
