Abstract
Glycogen persistence in ultramarathon athletes after six hours of exercise
Highlights
Context: To determine the effect of ultra-endurance exercise on the intramuscular glycogen reserves of an ultra-marathon runner
The present study investigated the effect of ultra-endurance exercise on intramuscular glycogen reserves
Our results show that ultra-endurance exercise to exhaustion promoted muscle glycogen depletion predominantly in a specific type of muscle fibres
Summary
Context: To determine the effect of ultra-endurance exercise on the intramuscular glycogen reserves of an ultra-marathon runner. Case report: 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. A 36-year.-old, 162 cm tall, 60.9 Kg body mass weight, 24 hr race champion runner signed consent term and UNIFESP Ethics Committee on Human Research approved all procedures (protocol number: 2061/07)
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