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Effects of training on cardiorespiratory function in the horse.
Abstract: The effects of 5- and 10-wk treadmill exercise training on cardiorespiratory function were evaluated in the horse. Cardiac output (Q), heart rate (HR), and stroke volume (SV), as well as left ventricular (LVP), aortic (AoP), and mean right atrial (RAP) pressures and the peak first time derivative of LVP (LV dP/dtmax), were measured at rest and at five different levels of exercise up to 90% of initial predicted maximal HR (HRmax). Oxygen uptake (VO2) and respiratory exchange ratio (R) were also obtained under the same conditions. At rest, although HR was no different after training, LV dP/dtmax was lower at 10 wk (2,369 +/- 502 vs. 1,615 +/- 302 mmHg/s). At the different measured work loads during exercise, Q and VO2 remained unchanged with training, whereas there were consistent trends toward lower LVP, AoP, and LV dP/dtmax and significant reductions in HR and R (both P less than 0.05). In contrast, SV and mean RAP were elevated (P less than 0.05) during exercise after the 10-wk training program. Although the observed changes in cardiorespiratory function in response to a training program in the horse are generally similar to those reported for other species, our data also suggest a training-induced increase in venous pressures during exercise as measured by elevated mean RAP values.
Publication Date: 1983-08-01 PubMed ID: 6881374DOI: 10.1152/ajpregu.1983.245.2.R160Google 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 article explores how treadmill exercise training affects cardiorespiratory function in horses, specifically examining changes in various cardiac and respiratory parameters. Training programs were found to lower heart rates, among other improvements, with some variation in trends compared to other species.
Objective of the research
- The purpose of this study was to investigate the impact of 5- and 10-week treadmill exercise training on cardiorespiratory function in horses. Cardiorespiratory function was evaluated by assessing various parameters like cardiac output, heart rate, stroke volume, ventricular and atrial pressures, oxygen uptake and respiratory exchange ratio at rest and during exercise.
Key Findings
- Resting heart rate did not significantly change after training. However, the peak first time derivative of left ventricular pressure (LV dP/dtmax) decreased after 10 weeks.
- During the different measured workloads during exercise, cardiac output and oxygen uptake remained the same irrespective of the training. But there were trends towards lower ventricular and aortic pressures, and a significant reduction in heart rate and respiratory exchange ratios.
- Training led to an increase in stroke volume and mean right atrial pressure during exercise, as observed after the 10-week training program.
- The changes in cardiorespiratory function in response to training in horses are generally similar to those reported for other species. However, the study observed an unusual training-induced increase in venous pressures during exercise, which is indicated by the elevated mean right atrial pressure values.
Significance of the research
- This research is significant as it adds to the understanding of how exercise training modulates cardiorespiratory function in horses, an area of research which has applications in race horse training and veterinary medicine.
Cite This Article
APA
Thomas DP, Fregin GF, Gerber NH, Ailes NB.
(1983).
Effects of training on cardiorespiratory function in the horse.
Am J Physiol, 245(2), R160-R165.
https://doi.org/10.1152/ajpregu.1983.245.2.R160 Publication
Researcher Affiliations
MeSH Terms
- Animals
- Aorta / physiology
- Cardiac Output
- Female
- Heart / physiology
- Heart Rate
- Horses / physiology
- Lung / physiology
- Oxygen Consumption
- Physical Exertion
- Respiration
- Ventricular Function
Citations
This article has been cited 5 times.- Massie S, Bayly W, Ohmura H, Takahashi Y, Mukai K, Léguillette R. Field-training in young two-year-old thoroughbreds: investigating cardiorespiratory adaptations and the presence of exercise induced pulmonary hemorrhage. BMC Vet Res 2024 Apr 26;20(1):159.
- Ringmark S, Lindholm A, Hedenström U, Lindinger M, Dahlborn K, Kvart C, Jansson A. Reduced high intensity training distance had no effect on VLa4 but attenuated heart rate response in 2-3-year-old Standardbred horses. Acta Vet Scand 2015 Mar 20;57(1):17.
- Ohmura H, Matsui A, Hada T, Jones JH. Physiological responses of young thoroughbred horses to intermittent high-intensity treadmill training. Acta Vet Scand 2013 Aug 17;55(1):59.
- Gauvreau GM, Young SS, Staempfli H, McCutcheon LJ, Wilson BA, McDonell WN. The relationship between respiratory exchange ratio, plasma lactate and muscle lactate concentrations in exercising horses using a valved gas collection system. Can J Vet Res 1996 Jul;60(3):161-71.
- Evans DL, Rose RJ. Cardiovascular and respiratory responses to submaximal exercise training in the thoroughbred horse. Pflugers Arch 1988 Mar;411(3):316-21.
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