Effects of Taurine Administration on Carbohydrate Metabolism in Skeletal Muscle during the Post-Exercise Phase

Abstract

SummaryWe previously reported that taurine (2-aminoethanesulfonic acid; dose: 0.5 mg/g body weight) administration after treadmill running at 25 m/min for 90 min increased the glycogen concentration in the skeletal muscle of ICR mice at 120 min after the exercise ). In the current study, we further investigated the effects of taurine administration on glycogen repletion and carbohydrate metabolism in the tibialis anterior muscle after endurance exercise. The metabolomic profiles of the tibialis anterior muscle at 120 min after the exercise were analyzed by a capillary electrophoresis-time-offlight mass spectrometry (n56). Fructose-1,6-bisphosphate (F1,6P), a glycogenolytic/glycolytic intermediate produced by phosphofructokinase, was significantly lower in the taurine-treated group than that in the control group (p,0.01). Dihydroxyacetonephosphate (DHAP), a downstream product of F1,6P was lower (p50.05) and glycerol 3-phosphate, a downstream product of F1,6P and DHAP, tended to be lower (p50.09) in the taurinetreated group than in the controls. At that time, phosphorylated Ser 293 on the E1a subunit of pyruvate dehydrogenase (PDH) tended to be higher in the taurine-treated mice than in the controls (p50.09, n55). There was a positive correlation between phosphorylation of the PDH E1a subunit at Ser 293 and glycogen concentration (r50.73, p,0.05). Our results showed that the enhanced glycogen repletion in skeletal muscle by taurine treatment during the post-exercise phase was accompanied by the lower levels of glycogenolytic/glycolytic intermediates. Key Words skeletal muscle, post-exercise recovery, taurine, glycogenolysis/glycolysis, pyruvate dehydrogenase Skeletal muscle glycogen level is considered a major determinant of performance during prolonged moderate-to high-intensity exercise (1-4). When athletes participate in multiple training sessions or competitions, recovery of skeletal muscle glycogen content after exercise is one of the determinants of subsequent exercise performance. As it was reported that oral administration of taurine (2-aminoethanesulfonic acid), which is a sulfur-containing b-amino acid that does not act as a substrate for energy metabolism, increased glycogen concentration in the liver after glucose loading (5), we previously examined whether taurine administration stimulates post-exercise glycogen repletion in skeletal muscle (6). Indeed, we observed enhanced glycogen repletion in skeletal muscle of the taurine-treated mice compared with that of the control mice after endurance exercise. Furthermore, we also found that taurine administration significantly increased voluntary wheel running activity after strenuous exercise in mice; voluntary wheel running activity is thought to indicate recovery from exercise-induced fatigue (7). These results suggest that post-exercise taurine treatment enhanced glycogen repletion in skeletal muscle and then improved performance during subsequent exercise.Taurine is thought to be involved in various physiological processes including antioxidant processe...

Oral taurine improves critical power and severe-intensity exercise tolerance

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