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J Appl Physiol 81: 1495-1500, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology
Vol. 81, No. 4, pp. 1495-1500, October 1996
EXERCISE AND MUSCLE

Muscle glycogen recovery after exercise during glucose and fructose intake monitored by 13C-NMR

Adrianus J. Van Den Bergh, Sibrand Houtman, Arend Heerschap, Nancy J. Rehrer, Hendrikus J. Van Den Boogert, Berend Oeseburg, and Maria T. E. Hopman

Departments of Radiology and Physiology, University of Nijmegen, 6500 HB Nijmegen, The Netherlands; and School of Physical Education, Otago University, Dunedin, New Zealand

Received 8 May 1995; accepted in final form 31 May 1996.

Van Den Bergh, Adrianus J., Sibrand Houtman, Arend Heerschap, Nancy J. Rehrer, Hendrikus J. Van Den Boogert, Berend Oeseburg, and Maria T. E. Hopman. Muscle glycogen recovery after exercise during glucose and fructose intake monitored by 13C-NMR. J. Appl. Physiol. 81(4): 1495-1500, 1996.---The purpose of this study was to examine muscle glycogen recovery with glucose feeding (GF) compared with fructose feeding (FF) during the first 8 h after partial glycogen depletion by using 13C-nuclear magnetic resonance (NMR) on a clinical 1.5-T NMR system. After measurement of the glycogen concentration of the vastus lateralis (VL) muscle in seven male subjects, glycogen stores of the VL were depleted by bicycle exercise. During 8 h after completion of exercise, subjects were orally given either GF or FF while the glycogen content of the VL was monitored by 13C-NMR spectroscopy every second hour. The muscular glycogen concentration was expressed as a percentage of the glycogen concentration measured before exercise. The glycogen recovery rate during GF (4.2 ± 0.2%/h) was significantly higher (P < 0.05) compared with values during FF (2.2 ± 0.3%/h). This study shows that 1) muscle glycogen levels are perceptible by 13C-NMR spectroscopy at 1.5 T and 2) the glycogen restoration rate is higher after GF compared with after FF.

glycogen depletion; vastus lateralis muscle; bicycle exercise; 1.5 tesla; carbon-13 nuclear magnetic resonance spectroscopy

0161-7567/96 $5.00 Copyright © 1996 the American Physiological Society




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