Effect of an endurance race on muscle amino acids, pro- and macroglycogen and triglycerides.

The research investigates the impact of an endurance race on horses, focusing on pro- and macroglycogen levels, amino acids, and triglycerides within muscle tissue, and blood parameters. The study indicates that an endurance race impacts amino acid metabolism, leading to net protein degradation that may extend into the recovery phase.

Research Methods and Purpose

• The main goal of this study was to obtain a better understanding of amino acid metabolism, along with the changes in pro- and macroglycogen, and triglycerides in muscle during prolonged exercise.
• Seven endurance-trained horses were used in this study. They were made to complete an endurance race spanning 100-120 km.
• Blood samples were taken from these horses at different stages: a day before the race, right after the conclusion of the race, and one day and eight days post-race.
• Additionally, biopsy specimens from the gluteus medius muscle were obtained immediately after the race and eight days following the race.

Findings

• The muscle concentrations of pro- and macroglycogen decreased after the race, contrasting with most amino acid concentrations which increased.
• During the eight-day recovery period, triglyceride concentrations in the muscles remained consistent.
• Several amino acids in the serum showed elevated levels during the recovery phase as compared to the pre-race phase.

Interpretation and Conclusion

• These findings suggest that an endurance race significantly affects amino acid metabolism and may prompt a net protein degradation that continues throughout the recovery period.
• In addition, it is suggested from the results that during an endurance race, horses utilize macroglycogen more than proglycogen for their energy needs.
• The study concluded with a call for further research focusing on amino acid metabolism during an endurance race, as it appears to play a key role in terms of performance and post-exercise recovery.