Research pertaining to the relevance of skeletal muscle glycogen availability during high intensity exercise was first suggested in the work of Saltin [1,2]. Intense physical exercise is accompanied by rapid glycogen depletion and lactate accumulation in the working muscle, indicating a high rate of glycolysis (Figure 1). Glycogen depletion in human skeletal muscle following heavy exercise was investigated by Gollnick et al. [3,4]. Six 1 min sprints with 10 mins recovery between each exercise were performed at 150% of each individual subjects maximal aerobic power (VO2 max). Biopsy samples were taken from the vastus lateralis muscle at rest and aіer the first third and finaO work bouts. Total muscle glycogen declined as a function of the number of work bouts. Нe relative concentration of glycogen was determined from histochemical staining. Нe first fibres to become depleted of their glycogen stores were the low oxidative, high glycolytic, fast twitch fibres Нis suggests an early recruitment of these fibres during heavy exercise.
Updated on July 9, 2020