What question did this study set out to answer?

To evaluate left ventricular function and regional myocardial performance in untrained ponies during strenuous treadmill exercise and the recovery period.

January 1, 1989Equine Veterinary Journal

Left ventricular function and haemodynamics in ponies during exercise and recovery

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Why the study?

Does strenuous treadmill exercise alter left ventricular function and haemodynamics in untrained ponies?

Key Points

To evaluate left ventricular function and regional myocardial performance in untrained ponies during strenuous treadmill exercise and the recovery period.
Monitored cardiac performance in physically untrained ponies using chronically implanted instrumentation (N=7) or standard catheterization (N=2).
Measured heart rate, left ventricular pressures, segment shortening velocity, and regional stroke work at rest, during strenuous treadmill exercise, and across post-exercise recovery.
During exercise (mean heart rate 203 ± 3 beats/min), left ventricular peak systolic pressure rose from 125 ± 2 to 208 ± 6 mmHg, and end-diastolic pressure rose from 29 ± 1 to 58 ± 3 mmHg (both P < 0.05).
Peak dP/dt increased from 1397 ± 144 to 6016 ± 325 mmHg/sec, accompanied by increases in systolic shortening velocity (193%) and stroke work (109%).
During recovery, myocardial segment systolic shortening fell significantly below baseline for 10 minutes (maximal reduction of 22% at 2 minutes post-exercise, P < 0.05), while stroke work dropped to 67% of resting control values.

Structured PICO

Does strenuous treadmill exercise alter left ventricular function and haemodynamics in untrained ponies?

Population

9 physically untrained ponies (7 with chronically implanted instrumentation, 2 with conventional catheter technique)

Intervention

Strenuous treadmill exercise

Comparator

Resting control values

Outcome

Myocardial and haemodynamic responses (heart rate, left ventricular peak systolic and end-diastolic blood pressure, dP/dt, myocardial segment velocity of shortening, stroke work, segment systolic shortening)surrogate

Untrained ponies experience significantly diminished left ventricular function in the immediate post-exercise period despite completing short bouts of near-maximal exercise.

Discussion

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Implication

Post-exercise LV shortening decline in untrained ponies is hypothesis-generating; leaves open relevance to equine athletes or translational models.

Cite This Study

Rugh et al. (1989) studied this question.

synapsesocial.com/papers/6a8fdbf186bcbf2f678c8b0f https://doi.org/10.1111/j.2042-3306.1989.tb02087.x

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Implication

Post-exercise LV shortening decline in untrained ponies is hypothesis-generating; leaves open relevance to equine athletes or translational models.

Left ventricular function and haemodynamics in ponies during exercise and recovery

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Left ventricular function and haemodynamics in ponies during exercise and recovery

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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