The haematological and biochemical changes associated with racing over 235 and 420 metres were studied in 23 greyhounds. Blood samples were collected while the dogs were resting and immediately after and 30 minutes after racing. Significant increases in red blood cell count, haemoglobin concentration and haematocrit occurred. The increase in haematocrit was accompanied by increases in total plasma protein and creatinine concentrations. Blood lactate increased to 11.4 and 13.2 mmol/litre over 235 and 420 metres, respectively, and plasma glucose increased to 7.9 and 8.2 mmol/litre. After the 420 metres, the mean plasma ammonia concentration was 256 mumol/litre. Plasma free fatty acid concentrations also increased after dogs had run both distances. The highest concentrations of glycerol and uric acid were found 30 minutes after exercise.
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