Abstract
Abstract: To determine the effect of ultra-endurance exercise on the intramuscular glycogen reserves of an ultra-marathon runner, an athlete ran for six consecutive hours with no caloric replacement. Biopsies of the Vastus lateralis were taken pre and post exercise. The fragments were frozen and later histochemically prepared using the PAS technique. Significant amounts of glycogen were found in the post-exercise sample. Conclusion: Ultra endurance exercise cannot fully deplete glycogen in muscle of trained individuals.
Highlights
A 36 year old, 162 cm tall, 60.9 Kg body mass weight, 24 h race champion runner signed a written consent term after being informed of all the procedures involved in the study
The athlete was clinically evaluated by a medical doctor and, considered fit to participate in the study, was submitted to a muscular biopsy taken from the distal vastus lateralis muscle region
Its function is probably to translocate the GLUT4 carrier protein to the cell membrane, where GLUT4 is the most important glucose carrier isoform during exercise [16]. This capture is important since blood flow to active muscles can increase up to twenty fold during intense exercise [17]. This process probably prevents a critical reduction of intramuscular glycogen reserves, since it increases in the same way as glyconeogenic activity in the liver [5]
Summary
A 36 year old, 162 cm tall, 60.9 Kg body mass weight, 24 h race champion runner signed a written consent term after being informed of all the procedures involved in the study. The Federal University of São Paulo Ethics Committee on Human Research approved all experimental procedures (Protocol number: 2061/07)
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