Characteristics of Respiratory Function during Swimming Exercise in Thoroughbreds.

Male Respiration Physical Exertion Blood Pressure 04 agricultural and veterinary sciences Pulmonary Artery 0403 veterinary science Inhalation Heart Rate Physical Conditioning, Animal Lactates Animals Female Horses Swimming
DOI: 10.1292/jvms.60.687 Publication Date: 2002-10-09T03:07:09Z
ABSTRACT
Equine respiratory patterns during swimming were examined in five normal horses. The experiment included a preliminary warming-up stage and 6 circuits of swimming around an annular pool of a 50-meter-circumference. The horses were examined for respiratory rates, intratracheal pressures, inspiratory time (TI), expiratory time (TE), respiratory cycle (T; TI + TE), heart rates, blood lactate concentrations, hematocrit and blood gases. The respiratory rates were maintained around 25/min. Blood gas values changed significantly during swimming. The intratracheal pressures during expiration and inspiration increased significantly with exercise duration compared to the immediately after the warming-up stage. The duty ratio (TI/T) averaged 0.33, which implied that the expiratory time was roughly doubled the inspiratory time. We considered that a longer expiratory time may limit sudden collapse of airways by water pressure during swimming and prevent a radical decrease of air space volume, thus maintains buoyancy.
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