In gen­eral, the “wet” cool­ing meth­ods per­formed bet­ter than the dry meth­ods, and cool­ing the limb as well as the foot was more ef­fec­tive than chill­ing the hoof alone.

EQUUS - - Medical Front -

as the foot was more ef­fec­tive than chill­ing the hoof alone. For in­stance, ap­ply­ing an ice pack to the hoof pro­duced a me­dian hoof wall sur­face tem­per­a­ture of 19.8 de­grees Cel­sius (67 de­grees Fahren­heit), while an ice­filled bag cov­er­ing the hoof and pastern low­ered the me­dian to 5.2 de­grees Cel­sius (41 de­grees Fahren­heit).

The wet meth­ods were more ef­fec­tive, says van Eps, be­cause they un­der­mined a body’s nat­u­ral in­su­la­tion. “The hair on a horse’s limb is de­signed to pre­vent the con­duc­tion of heat out of the ves­sels---that al­low rapid in­creases in net blood flow to the foot,” he ex­plains. “Th­ese are typ­i­cal of ther­moreg­u­la­tory or­gans, like the ears of an ele­phant; they help the an­i­mal main­tain tem­per­a­ture. In the horse, they make cool­ing much harder, as the horse can rapidly and mas­sively in­crease blood flow to the foot, re­plen­ish­ing the tis­sue with warm blood, warm­ing the tis­sue. For this rea­son, it is im­por­tant to cool the in­com­ing blood, and this re­quires cool­ing fur­ther up the limb.”

The one dry ap­pli­ca­tion



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