Nutritional Influences on Skeletal Muscle and Muscular Disease.

The research article investigates the relationship between nutrition and skeletal muscle growth and recovery in horses, their metabolic process during exercise, and how dietary changes can manage certain heritable muscle disorders.

Understanding Muscular Mass and Function in Horses

• The study sheds light on the fact that skeletal muscle makes up 40% to 55% of the mature body weight in horses and its growth is largely dependent on the rate of muscle protein synthesis.
• It emphasizes that to support the physical effort, horses require appropriate energy sources. Interestingly, glucose can fuel both types of exercise – anaerobic (short, intense bouts) and aerobic (long, sustained), whereas fat can only be utilized during aerobic exercise. This highlights the importance of glucose as an adaptable energy source in a horse’s diet.

Post-Exercise Recovery and Nutrition

• The research findings underline that following physical effort, ingestion of nonfiber carbohydrates and protein contributes to muscle growth and recovery, thereby optimizing the horse’s physical performance and overall well-being.
• However, the researchers also note that muscle glycogen refill is a slow process in horses and seems to be not significantly affected by dietary interventions. The slow replenishment of muscle glycogen indicates a possible need for a well-structured recovery plan post-exercise.

Managing Muscle Disorders with Dietary Adjustments

• The study identifies several inheritable muscle disorders in horses including type 1 and type 2 polysaccharide storage myopathy and recurrent exertional rhabdomyolysis. It also presents dietary restrictions as a helpful management technique.
• The researchers recommend restricting the intake of nonstructural carbohydrates in the diet for managing the above-mentioned muscle disorders. This implies that the horse’s diet could be modified as a potential non-pharmacological intervention to have a positive influence on specific muscular diseases.