PMID: 3769882Sep 1, 1986Paper

Changes in serum muscle enzyme levels associated with training schedules and stage of the oestrous cycle in Thoroughbred racehorses

Equine Veterinary Journal
H C FrauenfelderW R Allen

Abstract

Blood samples were collected twice weekly over a nine month period from 24 Thoroughbred racehorses in training at Newmarket to study the effects of daily training schedules and stage of oestrous cycle on serum enzyme levels and clinical signs of equine exertional myopathy. The sampling period extended from November to July and was performed between 16:00 h and 18:00 h so as to be at least 6 h after exercise. Serum creatine kinase, aspartate aminotransferase and plasma progestogen concentrations were measured. All horses were subjected to a similar traditional training programme. The study demonstrated marked fluctuations in serum muscle enzyme concentrations which were more pronounced in two-year-old fillies than three-year-old fillies and colts. There was no correlation, however, with the stage of oestrous cycle. It was concluded that some degree of muscle cell damage, which results in a variable increase in serum creatine kinase levels, occurs in all horses following light exercise after a rest day. Traditional flat race training may not be ideal in this respect and it is suggested that, for horses with an observed tendency towards exertional myopathy, more consistent and longer periods of less strenuous exercise may be advan...Continue Reading

References

Apr 1, 1977·Equine Veterinary Journal·D K Mason, H W Kwok
Jan 1, 1975·Equine Veterinary Journal·D J Blackmore, D Elton
Jul 1, 1975·Equine Veterinary Journal·M G Anderson
Jan 1, 1973·Australian Veterinary Journal·J G McLean
Apr 1, 1969·Australian Veterinary Journal·J D Steel
Apr 1, 1959·Vox Sanguinis·F J PINKERTONJ NOADES

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Citations

Mar 16, 2006·Equine Veterinary Journal·S WilsherJ L N Wood
Jun 1, 1990·Equine Veterinary Journal. Supplement·P A HarrisP D Rossdale
Oct 4, 2021·Equine Veterinary Journal·Petra BuckleyKristopher J Hughes

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