Cardiorespiratory drift during exercise in the horse.
Abstract: The purpose of the present study was to measure the time-course and degree of cardiovascular and respiratory 'drift' during constant submaximal exercise in the horse. One Thoroughbred and four Morgan mares were instrumented for simultaneous measurement of respiratory and blood gases which also enabled cardiac output (Q) to be calculated. Data were collected at rest, and at 10, 20 and 30 mins during a constant workload which elicited an initial exercising heart rate (HR) of 150 beats/min, and an approximate 15-fold increase in oxygen consumption (VO2). Significant cardiac and respiratory drift during exercise were observed over time so that ventilation increased from 750 +/- 58 to 910 +/- 49 litres/min (21 per cent increase) from the 10 to 30 min time-point (P < 0.05) and HR went from 154 +/- 4 to 173 +/- 9 beats/min (mean +/- se) over the same time period (P < 0.05). Q also rose from 142 +/- 5 to 177 +/- 17 litres/min (P < 0.05) during the same interval while stroke volume (SV) was maintained. Rectal temperature (TR) and mixed venous lactate (LA) also showed significant increases during exercise while PaO2 and PaCO2 remained constant. The results indicate a significant degree of cardiac and respiratory drift in the horse in response to strenuous submaximal exercise. At the constant exercise work rate chosen, a levelling off, or plateauing of the selected parameters of interest was not observed. Therefore if a true exercising 'steady-state' was achieved, it must have occurred very early in the exercise bout.
Publication Date: 1990-06-01 PubMed ID: 9259809DOI: 10.1111/j.2042-3306.1990.tb04737.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
- Research Support
- Non-U.S. Gov't
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 research paper studies the measure of time-course and degree of cardiovascular and respiratory ‘drift’ during consistent submaximal exercise in horses to provide insights into their physical responses during strenuous activity.
Understanding the Research Methodology and Participants Used
- The research was conducted on one Thoroughbred and four Morgan mares who were prepared for simultaneous measurement of respiratory and blood gases.
- The aforementioned preparation made it possible to calculate the cardiac output (Q), which is the heart’s ability to pump blood.
- Data was collected at rest, and at intervals of 10, 20, and 30 minutes during a constant workload which induced an initial exercising heart rate (HR) of 150 beats/min, and an approximate 15-fold increase in oxygen consumption (VO2).
Results and Observations from the Data Collected
- There was a significant cardiac and respiratory drift during exercise observed over time.
- During the 10 to 30-minute interval, ventilation increased from 750 +/- 58 to 910 +/- 49 litres/min (a 21 per cent increase).
- Heart rate went from 154 +/- 4 to 173 +/- 9 beats/min over the same time span.
- Cardiac output (Q) also rose from 142 +/- 5 to 177 +/- 17 litres/min during the same interval. It’s important to note that the stroke volume (SV), which is the amount of blood pumped per heartbeat, was maintained.
- Other physiological parameters such as rectal temperature (TR) and mixed venous lactate (LA) also significantly increased during exercise.
- The partial pressure of oxygen (PaO2) and carbon dioxide (PaCO2) in arterial blood remained constant.
Interpretation of the Results
- The results signal a significant degree of cardiac and respiratory drift – a phenomenon characterized by an unexplained increase in heart rate and body temperature – in the horse in response to strenuous submaximal exercise.
- A lack of plateauing in the observed parameters hints that if a true exercising ‘steady-state’ was achieved, it must have occurred very early in the exercise bout.
Cite This Article
APA
Thomas DP, Fregin GF.
(1990).
Cardiorespiratory drift during exercise in the horse.
Equine Vet J Suppl(9), 61-65.
https://doi.org/10.1111/j.2042-3306.1990.tb04737.x Publication
Researcher Affiliations
- Virginia-Maryland Regional College of Veterinary Medicine, Leesburg 22075, USA.
MeSH Terms
- Animals
- Bicarbonates / blood
- Blood Pressure / physiology
- Body Temperature / physiology
- Cardiac Output / physiology
- Cardiovascular Physiological Phenomena
- Exercise Test / methods
- Exercise Test / veterinary
- Female
- Heart Rate / physiology
- Hemoglobins / analysis
- Horses / blood
- Horses / physiology
- Hydrogen-Ion Concentration
- Lactates / blood
- Oxygen Consumption / physiology
- Physical Conditioning, Animal / physiology
- Respiration / physiology
- Stroke Volume / physiology
- Time Factors
Citations
This article has been cited 3 times.- Lindinger MI. Oral Electrolyte and Water Supplementation in Horses.. Vet Sci 2022 Nov 10;9(11).
- Tennent-Brown BS, Goetz TE, Manohar M, Hassan AS, Freeman DE, Bundy JS, Evans MR. Hyperhydration prior to a simulated second day of the 3-day moderate intensity equestrian competition does not cause arterial hypoxemia in Thoroughbred horses.. Eur J Appl Physiol 2006 Jul;97(4):462-70.
- Laursen PB, Rhodes EC. Factors affecting performance in an ultraendurance triathlon.. Sports Med 2001;31(3):195-209.
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
