Décombaz, Jacques; Schmitt, Beat; Ith, Michael; Decarli, Bernard; Diem, Peter; Kreis, Roland; Hoppeler, Hans-Heinrich; Bösch, Christoph Hans (2001). Postexercise fat intake repletes intramyocellular lipids but no faster in trained than in sedentary subjects. American journal of physiology - regulatory, integrative and comparative physiology, 281(3), R760-9. Bethesda, Md.: American Physiological Society
Full text not available from this repository. (Request a copy)The hypotheses that postexercise replenishment of intramyocellular lipids (IMCL) is enhanced by endurance training and that it depends on fat intake were tested. Trained and untrained subjects exercised on a treadmill for 2 h at 50% peak oxygen consumption, reducing IMCL by 26-22%. During recovery, they were fed 55% (high fat) or 15% (low fat) lipid energy diets. Muscle substrate stores were estimated by (1)H (IMCL)- and (13)C (glycogen)-magnetic resonance spectroscopy in tibialis anterior muscle before and after exercise. Resting IMCL content was 71% higher in trained than untrained subjects and correlated significantly with glycogen content. Both correlated positively with indexes of insulin sensitivity. After 30 h on the high-fat diet, IMCL concentration was 30-45% higher than preexercise, whereas it remained 5-17% lower on the low-fat diet. Training status had no significant influence on IMCL replenishment. Glycogen was restored within a day with both diets. We conclude that fat intake postexercise strongly promotes IMCL repletion independently of training status. Furthermore, replenishment of IMCL can be completed within a day when fat intake is sufficient.
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