Postexercise fat intake repletes intramyocellular lipids but no faster in trained than in sedentary subjects

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

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology > DCR Magnetic Resonance Spectroscopy and Methodology (AMSM)
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Endocrinology, Diabetology and Clinical Nutrition
07 Faculty of Human Sciences > Institute of Sport Science (ISPW)
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Forschungsbereich Pavillon 52 > Abt. Magnetresonanz-Spektroskopie und Methodologie, AMSM

UniBE Contributor:

Schmitt, Beat; Ith, Michael; Diem, Peter; Kreis, Roland; Hoppeler, Hans-Heinrich and Bösch, Christoph Hans

Subjects:

700 Arts > 790 Sports, games & entertainment
600 Technology > 610 Medicine & health

ISSN:

0363-6119

ISBN:

11506990

Publisher:

American Physiological Society

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:56

Last Modified:

17 Mar 2015 22:03

PubMed ID:

11506990

Web of Science ID:

000170558400010

URI:

https://boris.unibe.ch/id/eprint/23866 (FactScience: 44870)

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