Ultramarathon run markedly reduces plasma sphingosine-1-phosphate concentration

Area of Science:

• Exercise physiology
• Biochemistry
• Lipid metabolism

Background:

• Acute exercise impacts sphingolipid levels.
• Sphingosine-1-phosphate (S1P) and ceramide are key bioactive lipids.
• Understanding endurance exercise effects on lipids is crucial.

Purpose of the Study:

• To investigate the impact of a 48-hour ultramarathon on plasma and erythrocyte sphingolipids.
• To analyze changes in S1P, sphinganine-1-phosphate (SA1P), sphingosine, sphinganine, and ceramide.
• To correlate sphingolipid alterations with ultraendurance exertion.

Main Methods:

• Blood samples collected from seven male runners during a 48-hour ultramarathon and recovery.
• Quantification of sphingolipids (S1P, SA1P, sphingosine, sphinganine, ceramide) using High-Performance Liquid Chromatography (HPLC).
• Analysis of lipid levels at pre-race, 24h, 48h running, and 24h, 48h recovery.

Main Results:

• Plasma S1P progressively declined during the 48-hour run and remained low during recovery.
• Erythrocyte S1P levels were stable during running, then significantly increased after 48 hours of recovery.
• Plasma SA1P decreased during the run, while erythrocyte SA1P increased during running and normalized post-race. Ceramide levels remained unchanged.

Conclusions:

• Ultraendurance running significantly alters plasma and erythrocyte sphingolipid profiles, notably decreasing plasma S1P.
• The reduction in plasma S1P may contribute to negative side-effects associated with extreme endurance events.
• Further research is needed to elucidate the functional implications of these sphingolipid changes in athletes.