High-Intensity Exercise and Carbohydrate Supplementation do not Alter Plasma Visfatin

Area of Science:

• Exercise Physiology
• Endocrinology
• Sports Nutrition

Background:

• Visfatin, an adipokine, plays a role in metabolic regulation.
• The impact of acute exercise and carbohydrate intake on visfatin is not fully understood.

Purpose of the Study:

• To investigate the effects of high-intensity interval exercise and carbohydrate supplementation on plasma visfatin concentrations in sprint-trained males.

Main Methods:

• Ten sprint-trained males underwent two trials: one with carbohydrate (CHO) ingestion and one with a placebo (CON).
• Exercise consisted of four 3-minute cycling bouts at 50% mean anaerobic power with rest intervals.
• Blood samples were collected pre- and post-exercise for visfatin, glucose, and insulin analysis. Truncal fat was assessed.

Main Results:

• Plasma visfatin levels did not significantly differ between CHO and CON conditions or change significantly with exercise.
• Insulin and glucose levels were significantly elevated following CHO ingestion and remained high during exercise.
• Baseline visfatin showed a significant correlation with truncal fat (r² = 0.7782, p < 0.05).

Conclusions:

• High-intensity exercise and carbohydrate supplementation do not acutely affect plasma visfatin in sprint-trained males.
• Baseline visfatin levels are associated with truncal adiposity in this population.
• Further research is needed to elucidate the long-term relationship between visfatin, exercise, and body composition.