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Pre-exercise hypervolaemia is not detrimental to arterial oxygenation of horses performing a prolonged exercise protocol simulating the second day of a 3-day equestrian event
| Content Provider | Scilit |
|---|---|
| Author | Tennent‐Brown, B. S. Goetz, T. E. Manohar, M. Hassan, A. S. Freeman, D. E. Bundy, J. S. Evans, M. R. |
| Copyright Year | 2006 |
| Description | Journal: Equine veterinary journal Hyperhydration, prior to prolonged moderate-intensity exercise simulating the 2nd day of a 3-day equestrian event (E3DEC), may induce arterial hypoxaemia detrimental to performance. Because moderate-intensity exercise does not induce arterial hypoxaemia in healthy horses, the effects of pre-exercise hypervolaemia on arterial oxygenation were examined during a prolonged exercise protocol. Blood-gas studies were carried out on 7 healthy, exercise-trained Thoroughbred horses in control and hyperhydration experiments. The study conformed to a randomised crossover design. The sequence of treatments was randomised for each horse and 7 days were allowed between studies. Hyperhydration was induced by administering 0.425 g/kg bwt NaCl via nasogastric tube followed by free access to water. The exercise protocol was carried out on a treadmill set at a 3% uphill grade and consisted of walking at 2 m/sec for 2 min, trotting for 10 min at 3.7 m/sec, galloping for 2 min at 14 m/sec (which elicited maximal heart rate), trotting for 20 min at 3.7 m/sec, walking for 10 min at 1.8 m/sec, cantering for 8 min at 9.2 m/sec, trotting for 1 min at 5 m/sec and walking for 5 min at 2 m/sec. NaCl administration induced a significant mean +/- s.e. 15.5 +/- 1.1% increase in plasma volume as indicated by a significant reduction in plasma protein concentration. In either treatment, whereas arterial hypoxaemia was not observed during periods of submaximal exercise, short-term maximal exertion caused significant arterial hypoxaemia, desaturation of haemoglobin, hypercapnoea, and acidosis in both treatments. However, the magnitude of exercise-induced arterial hypoxaemia, desaturation of haemoglobin, hypercapnoea, and acidosis in both treatments remained similar, and statistically significant differences between treatments could not be demonstrated. It was concluded that significant pre-exercise expansion of plasma volume by this method does not adversely affect the arterial oxygenation of horses performing a prolonged exercise protocol simulating the 2nd day of an E3DEC. |
| Related Links | http://onlinelibrary.wiley.com/doi/10.1111/j.2042-3306.2006.tb05594.x/pdf |
| Ending Page | 501 |
| Page Count | 7 |
| Starting Page | 495 |
| e-ISSN | 20423306 |
| DOI | 10.1111/j.2042-3306.2006.tb05594.x |
| Journal | Equine veterinary journal |
| Issue Number | 36 |
| Volume Number | 38 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2006-08-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Equine veterinary journal Agriculture and Animal Production Veterinary Sciences Prolonged Exercise Blood‐gas Tensions Exercise‐induced Arterial Hypoxaemia |
| Content Type | Text |
| Resource Type | Article |
