Blood gas changes during incremental and sprint exercise.
Abstract: We investigated and compared arterial blood gas and ventilatory changes during rapid acceleration sprint and during incremental treadmill exercise. Seven clinically normal racehorses completed standardised incremental exercise tests and rapid acceleration tests at speeds calculated to elicit 115% VO2max. Arterial oxygen tension decreased (P < 0.001) between 15 s (mean +/- s.d. 103.8 +/- 14.3 mmHg) and 30 s (85.0 +/- 7.7 mmHg) after the onset of rapid acceleration exercise, but did not change significantly during the remainder of the sprint. This was accompanied by an increase in PaCO2 of 5.9 mmHg (P < 0.05). Despite reductions in SaO2 during exercise, CaO2 did not change due to increases in haemoglobin concentration. Heart rate increased rapidly (P < 0.001) during the first 15 s of exercise and thereafter remained constant. The mean maximum speed during the incremental test (11.4 +/- 0.5 m/s) was not significantly different to the speed calculated to elicit 115% VO2max during the sprint test (12.2 +/- 0.8 m/s). The mean peak HR and Hb during the sprint test were significantly less than during the incremental test. However, there were no significant differences in the maximum or minimum values achieved for other variables. We conclude that rapid acceleration exercise is accompanied by rapid changes in blood gas variables, reaching steady state within 45 s. Blood gas responses during the simpler incremental test describe maximal changes during high-intensity sprint exercise.
Publication Date: 2000-02-05 PubMed ID: 10659216DOI: 10.1111/j.2042-3306.1999.tb05182.xGoogle Scholar: Lookup
The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
- Journal Article
Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
This study provides insights into how arterial gas and ventilation changes in racehorses throughout high-intensity sprint and steady-state incremental exercises. The investigation revealed that a rapid shift in blood gas, reaching equilibrium within 45 seconds, follows the onset of abrupt acceleration. Also, although comparable speeds were recorded in both exercise types, heart rates and haemoglobin were markedly lower during sprint tests.
Objective
- This research study focused on investigating the alterations in arterial blood gas and breathing changes during high-intensity sprint and incremental treadmill exercise. The objective was to provide insight into understanding the physiological responses to different exercise intensities in racehorses.
Methodology
- Seven clinically normal racehorses underwent standardized incremental exercise tests and rapid acceleration tests. These tests were staged at velocities calculated to exceed maximum oxygen consumption (115% VO2max).
- Measurement of various parameters like arterial oxygen tension, partial pressure of carbon dioxide (PaCO2), oxygen saturation (SaO2), oxygen-carrying capacity of the blood (CaO2), and heart rate was done at specified intervals.
Findings
- The onset of rapid acceleration led to a significant drop in arterial oxygen tension in the initial 15 seconds, followed by no significant changes during the rest of the sprint.
- A noticeable augmentation of PaCO2, by an average of 5.9 mmHg, was recorded during this phase
- Heart rate displayed a swift increase (P < 0.001) during the initial 15 seconds of exercise, but then remained stable.
- Throughout the course of the exercise, although a reduction in blood oxygen saturation was noted, the overall oxygen-carrying capacity of the blood (CaO2) remained the same due to increased hemoglobin concentration.
Comparing Incremental and Sprint Test
- Maximum speeds achieved in incremental testing and sprint testing were not significantly different. The mean maximum speed during the incremental test (11.4 +/- 0.5 m/s) was near the speed calculated to elicit 115% VO2max during the sprint test (12.2 +/- 0.8 m/s).
- However, the mean peak heart rate and hemoglobin during the sprint test were significantly lower than during the incremental test.
- No significant differences were noted in the maximum or minimum values for other parameters between the two types of exercise.
Conclusion
- The study concluded that rapid acceleration exercise is associated with swift shifts in blood gas variables, attaining a steady state within 45 seconds.
- The research also implies that blood gas responses tracked in a simple incremental test can depict the maximal physiological changes that occur during high-intensity sprint exercise.
Cite This Article
APA
Christley RM, Evans DL, Hodgson DR, Rose RJ.
(2000).
Blood gas changes during incremental and sprint exercise.
Equine Vet J Suppl(30), 24-26.
https://doi.org/10.1111/j.2042-3306.1999.tb05182.x Publication
Researcher Affiliations
- Department of Veterinary Clinical Science, University of Sydney, NSW, Australia.
MeSH Terms
- Animals
- Blood Gas Analysis / veterinary
- Carbon Dioxide / blood
- Exercise Test / veterinary
- Horses / physiology
- Oxygen / blood
- Oxygen Consumption
- Running / physiology
Citations
This article has been cited 0 times.Use Nutrition Calculator
Check if your horse's diet meets their nutrition requirements with our easy-to-use tool Check your horse's diet with our easy-to-use tool
Talk to a Nutritionist
Discuss your horse's feeding plan with our experts over a free phone consultation Discuss your horse's diet over a phone consultation
Submit Diet Evaluation
Get a customized feeding plan for your horse formulated by our equine nutritionists Get a custom feeding plan formulated by our nutritionists
