Effects of conditioning on the left ventricular function of young purebred Arabian horses.
Authors: Ramos Gabriel Vieira, Santos Maíra Moreira, Gava Fábio Nelson, de Lacerda-Neto José Corrêa
Journal: PloS one
Summary
# Editorial Summary: Cardiac Conditioning Response in Young Arabian Horses Six weeks of structured conditioning produces measurable improvements in left ventricular function and aerobic capacity in young, previously untrained Arabian horses, according to recent echocardiographic analysis of 14 animals assessed both at rest and under stress. The researchers documented significant physiological adaptations including reduced resting and peak exercise heart rates, increased ventricular wall and septal thickness with corresponding increases in left ventricular mass, alongside improved stroke volume and cardiac output indices during post-stress testing. Conditioning-induced changes extended to diastolic function, with notably longer deceleration times and earlier onset of radial myocardial velocity during early diastole, whilst the pre-ejection period and its ratio to ejection time both decreased—all markers of enhanced cardiac efficiency. For equine practitioners managing young performance horses, these findings support the use of systematic conditioning programmes to develop functional cardiac capacity and aerobic fitness, with the implication that cardiovascular adaptation occurs relatively rapidly and measurably within a six-week timeframe. These objective cardiac improvements provide evidence-based justification for gradual conditioning protocols in young horses and may help inform training schedules, fitness assessments, and the early detection of inadequate cardiac adaptation to work.
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Practical Takeaways
- •Young horses show measurable cardiac improvements within just 6 weeks of conditioning, suggesting early training programs effectively build aerobic fitness
- •Resting heart rate reduction is a practical field indicator that conditioning is working at the physiological level
- •Proper conditioning produces beneficial cardiac remodeling (increased wall thickness and mass) rather than pathological changes
Key Findings
- •Six weeks of conditioning increased left ventricular wall thickness and mass while reducing resting and peak heart rate (p<0.001)
- •Conditioned horses showed improved stroke volume, cardiac output, ejection time and reduced pre-ejection period after stress test (p<0.05)
- •Conditioning protocol induced physiological cardiac adaptations consistent with improved aerobic capacity in young Arabian horses