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Title: No effect of glycogen level on glycogen metabolism during high intensity exercise
Authors: Vandenberghe, Kathleen ×
Hespel, Peter
Vanden Eynde, Bavo
Lysens, Roeland
Richter, Erich #
Issue Date: Feb-1995
Series Title: Medicine and science in sports and exercise vol:27 issue:9 pages:1278-1283
Abstract: This study examined the effect of glycogen supercompensation on glycogen breakdown, muscle and blood lactate accumulation, blood-pH, and performance during short-term high-intensity exercise. Young healthy volunteers performed two supramaximal (125% of VO2max) exercise tests on a bicycle ergometer, either for 1 min 45 s (protocol 1; N = 18) or to exhaustion (protocol 2; N = 14). The exercise tests were preceded by either 5 d on a controlled normal (N) diet, or by 2 d of glycogen-depleting exercise accompanied by the normal diet followed by 3 d on a carbohydrate-rich (CHR) diet. In protocol 1, preexercise muscle glycogen concentrations were 364 +/- 23 and 568 +/- 35 mumol.g-1 d.w. in the N and CHR condition, respectively (P < 0.05). During the exertion, glycogen concentration in the M. quadriceps decreased to the same extent in both groups. Accordingly, the exercise-induced increases in muscle and blood-lactate, and the fall in blood-pH were similar during N and CHR. In protocol 2, time to exhaustion was identical for N and CHR. It is concluded that during short-term intense exercise during which muscle glycogen availability exceeds glycogen demand, rate of glycogen breakdown, lactate accumulation, and performance are regulated irrespective of the preexercise muscle glycogen level.
ISSN: 0195-9131
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Medicine and Revalidation Section (-)
Exercise Physiology Research Group
× corresponding author
# (joint) last author

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