Left ventricular function and haemodynamics in ponies during exercise and recovery.
Abstract: Myocardial and haemodynamic responses to strenuous treadmill exercise were monitored with chronically implanted instrumentation in seven physically untrained ponies. In two other ponies, haemodynamics were monitored using a conventional catheter technique. During exercise (mean +/- sem heart rate = 203 +/- 3 beats/min), left ventricular peak systolic ahd end-diastolic blood pressure significantly increased from 125 +/- 2 to 208 +/- 6 mmHg and from 29 +/- 1 to 58 +/- 3 mmHg, respectively (P less than 0.05). Peak positive first derivative of left ventricular pressure (dP/dt) was also increased significantly, (1397 +/- 144 to 6016 +/- 325 mmHg/sec), as were myocardial segment velocity of shortening during systole (dL/dtsys) and stroke work (193 and 109 per cent, respectively). Paradoxically, segment systolic shortening was reduced significantly (P less than 0.05) with respect to resting control values for 10 mins after cessation of exercise, with the maximal reduction of 22 per cent occurring at 2 mins post exercise. In addition, left ventricular segment stroke work decreased significantly to 67 per cent of resting control value at 2 mins post exercise. This study demonstrates that analysis of regional myocardial performance in conjunction with haemodynamic data permits a detailed description of cardiac events during and immediately following exercise, facilitating definition of changes which are not readily reflected by haemodynamics. Based on these findings, the authors conclude that untrained ponies may readily complete short bouts of near-maximal exercise, yet experience significantly diminished left ventricular function in the immediate post exercise period.
Publication Date: 1989-01-01 PubMed ID: 2920699DOI: 10.1111/j.2042-3306.1989.tb02087.xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
- Research Support
- U.S. Gov't
- P.H.S.
Summary
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The study investigates the effects of strenuous exercise and recovery on the functioning and haemodynamics of the heart in physically untrained ponies.
Methodology
- The researchers carried out their experiments on seven ponies that had not been subjected to any physical training. Their heart responses to strenuous treadmill exercise were monitored using instrumentation that was chronically implanted.
- In the case of two other ponies, they monitored the haemodynamics using a traditional catheter technique.
Results during Exercise
- During the course of exercise, the heart rate reported was approximately 203 beats per minute. The study found significant increases in left ventricular peak systolic and end-diastolic blood pressure, from 125 mmHg and 29 mmHg to 208 mmHg and 58 mmHg respectively.
- The peak positive first derivative of the left ventricular pressure also showed a substantial increase.
- The myocardial segment velocity of shortening during systole and the stroke work both increased significantly – 193% and 109% respectively.
Results during Post-Exercise and Recovery
- Contrarily, following the 10-minute post-exercise recovery, a significant reduction was recorded in segment systolic shortening. The maximum decrease was 22%, recorded 2 minutes after the completion of the exercise.
- Additionally, 2 minutes into the post-exercise recovery period, the left ventricular segment stroke work dropped to 67% of the resting control value.
Implications and Conclusion
- The findings from this study reveal that an analysis of regional myocardial performance combined with haemodynamic data can give a detailed understanding of heart-related events during and after strenuous exercise. This can allow for a more nuanced identification of changes that are not easily discernible solely through haemodynamic data.
- The authors conclude that while physically untrained ponies can complete short bursts of near-maximal exercise, they experience a considerable decrease in left ventricular function in the immediate recovery period following the exercise.
Cite This Article
APA
Rugh KS, Garner HE, Miramonti JR, Hatfield DG.
(1989).
Left ventricular function and haemodynamics in ponies during exercise and recovery.
Equine Vet J, 21(1), 39-44.
https://doi.org/10.1111/j.2042-3306.1989.tb02087.x Publication
Researcher Affiliations
- John M. Dalton Research Center, University of Missouri, Columbia 65211.
MeSH Terms
- Animals
- Blood Gas Analysis / veterinary
- Blood Pressure
- Catheters, Indwelling / veterinary
- Electrolytes / blood
- Heart / physiology
- Heart Rate
- Hemodynamics
- Horses / physiology
- Lactates / blood
- Physical Exertion
- Stroke Volume
- Ventricular Function
Grant Funding
- F32-HL06999 / NHLBI NIH HHS
- R01-HL29007 / NHLBI NIH HHS
- T32-HL07187 / NHLBI NIH HHS
Citations
This article has been cited 1 times.- Jiang B, Rugh KS, Hatfield DG, Jiang D, Hahn AW. Nonlinear algorithm for identification of a fiducial marker for various cardiac events. Proc Annu Symp Comput Appl Med Care 1991;:455-9.
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