Ice
should be applied over the injured area as soon as possible after injury to
reduce the metabolic rate and oxygen requirements of the cells in the
surrounding area. These cells would otherwise die, causing secondary injury.
The cold also reduces the internal bleeding and swelling.
Care
must be taken when applying ice. The ice should not be placed in direct
contact with the skin but covered by a cloth to prevent cold burns. If the
area is being massaged with ice, oil should be applied to the skin. In the
initial stages of injury (usually the first 48 to 72 hours), ice should be
applied every 2 – 3 hours, reducing to 3 times a day as healing progresses
and swelling subsides.
Ice
should be applied for at least 10 – 15 minutes, increasing to 30 minutes,
unless the skin is sensitive and the area feels uncomfortable, in which
case, remove the ice for a minute, then re-apply. The skin should turn
colour: pink for pale skin, darker for dark skin.
Heat
should never be used in the acute (the first 48 hours) stages of injury as
it increases metabolic rate, increases the blood flow and causes swelling.
Heat may be used after healing has taken place and bruising has turned
yellow. Massage can be introduced at this stage to further promote healing
and remove scar tissue
There
are various ways to apply ice: