AVS-4160 Lecture Notes - Lecture 12: Standardbred, Furosemide, Strangles
1 Nov 2016
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Document Summary
Breathing frequency is capped at the gallop. A long trot challenges the cardiovascular and respiratory rates. In a horse, increases ve is due to increased respiratory frequency. Tidal volume increases linearly, regardless of speed. Respiratory rate increases until it becomes mechanically coupled, then it plateaus. When vo2 max is reached is an indicator of fitness. Fast atp production leads to a buildup of lactic acid and other waste products. The slow canter is more energetically efficient than a long trot. Breathing is only coupled with stride at the gallop: the horse can only inhale when it"s legs are extended, recurrent airway obstruction limits breathing ability beyond mechanical coupling. When rer is greater than 1. 0, the horse is very anaerobic due to lactate. Carbon dioxide is mostly dissolved in the blood in the form of bicarbonate. Exercise induced arterial hypoxemia is normal with acute exercise. Cardiac output becomes more efficient and challenges the blood vessels more.
