Endurance exercise in the horse–a review. Part I.

The research article is a comprehensive review of the physiological effects of endurance exercise on horses, covering areas such as energy use, fluid balance, hormonal changes, and potential clinical issues, with additional insights from human studies.

Overview of the Study

• The study represents an analysis over the past decade, focusing on the physiological impacts of endurance exercise on horses. This topic has gained relevance due to the global rise in popularity of endurance riding.
• Adopting a holistic view, the research tackles diverse facets such as energy utilization, fluid and electrolyte balance, acid-base balance, hormonal & metabolic transformations, muscle function, renal and hepatic function, haematological changes, and clinical problems arising from endurance rides.
• To offer a pertinent perspective, the research also includes findings from studies carried out on humans. This is expected to provide a comparative understanding of how endurance exercise impacts different species.

Key Sections of the Study

• Energy considerations: This section evaluates the energy expenditure and energy sources of horses during long-term physical activity. The nutritional demands of endurance exercise and how the horse’s body manages its energy sources efficiently are explored.
• Fluid and electrolyte balance: The part investigates how endurance exercise affects hydration levels and the balance of important salts in the horses’ bodies. The impact on the horses’ performance and health is discussed.
• Acid-base balance: This segment looks into how sustained exercise can affect the horses’ acid-base balance – which maintains the pH in the body fluids – and the inherent risks associated.
• Hormonal and metabolic changes: The study examines how endurance exercises can lead to hormonal changes and metabolic adaptations in horses to understand how these may influence performance and recovery.
• Muscle function: The research reviews how endurance exercise influences muscle health and function in horses, which is critical for performance improvement and injury prevention.
• Renal and hepatic function: The ways in which endurance exercise may affect the kidneys and livers of horses – organs essential for detoxification and metabolic regulation – are scrutinized.
• Haematological changes: The study analyzes how sustained exercise can impact the blood systems of horses, including changes to red and white blood cells and platelets.
• Clinical problems: The potential health complications that can emerge from intensive endurance exercises, which can comprise a wide array of diverse issues, are also examined to enhance the safety and wellness of sport horses.

Human studies

• The study also embeds insights from comparable human studies. Comparing physiological responses to endurance exercise in humans provides valuable insights into similarities and differences, augmenting the understanding of how different species respond to prolonged physical exertion.