Postexercise repletion of muscle energy stores with fructose or glucose in mixed meals.

Rosset, Robin; Lecoultre, Virgile; Egli, Léonie; Cros, Jérémy; Dokumaci, Ayse Sila; Zwygart, Karin; Boesch, Christoph Hans; Kreis, Roland; Schneiter, Philippe; Tappy, Luc (2017). Postexercise repletion of muscle energy stores with fructose or glucose in mixed meals. American journal of clinical nutrition, 105(3), pp. 609-617. American Society for Nutrition, Inc. 10.3945/ajcn.116.138214

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BACKGROUND Postexercise nutrition is paramount to the restoration of muscle energy stores by providing carbohydrate and fat as precursors of glycogen and intramyocellular lipid (IMCL) synthesis. Compared with glucose, fructose ingestion results in lower postprandial glucose and higher lactate and triglyceride concentrations. We hypothesized that these differences in substrate concentration would be associated with a different partition of energy stored as IMCLs or glycogen postexercise. OBJECTIVE The purpose of this study was to compare the effect of isocaloric liquid mixed meals containing fat, protein, and either fructose or glucose on the repletion of muscle energy stores over 24 h after a strenuous exercise session. DESIGN Eight male endurance athletes (mean ± SEM age: 29 ± 2 y; mean ± SEM peak oxygen consumption: 66.8 ± 1.3 mL · kg(-1) · min(-1)) were studied twice. On each occasion, muscle energy stores were first lowered by a combination of a 3-d controlled diet and prolonged exercise. After assessment of glycogen and IMCL concentrations in vastus muscles, subjects rested for 24 h and ingested mixed meals providing fat and protein together with 4.4 g/kg fructose (the fructose condition; FRU) or glucose (the glucose condition; GLU). Postprandial metabolism was assessed over 6 h, and glycogen and IMCL concentrations were measured again after 24 h. Finally, energy metabolism was evaluated during a subsequent exercise session. RESULTS FRU and GLU resulted in similar IMCL [+2.4 ± 0.4 compared with +2.0 ± 0.6 mmol · kg(-1) wet weight · d(-1); time × condition (mixed-model analysis): P = 0.45] and muscle glycogen (+10.9 ± 0.9 compared with +12.3 ± 1.9 mmol · kg(-1) wet weight · d(-1); time × condition: P = 0.45) repletion. Fructose consumption in FRU increased postprandial net carbohydrate oxidation and decreased net carbohydrate storage (estimating total, muscle, and liver glycogen synthesis) compared with GLU (+117 ± 9 compared with +135 ± 9 g/6 h, respectively; P < 0.01). Compared with GLU, FRU also resulted in lower plasma glucose concentrations and decreased exercise performance the next day. CONCLUSIONS Mixed meals containing fat, protein, and either fructose or glucose elicit similar repletion of IMCLs and muscle glycogen. Under such conditions, fructose lowers whole-body glycogen synthesis and impairs subsequent exercise performance, presumably because of lower hepatic glycogen stores. This trial was registered at clinicaltrials.gov as NCT01866215.

Item Type:

Journal Article (Original Article)

Division/Institute:

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)

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Dokumaci, Ayse Sila; Zwygart, Karin; Boesch, Christoph Hans and Kreis, Roland

ISSN:

0002-9165

Publisher:

American Society for Nutrition, Inc.

Language:

English

Submitter:

Christoph Hans Boesch

Date Deposited:

08 Jun 2017 15:57

Last Modified:

08 Jun 2017 15:57

Publisher DOI:

10.3945/ajcn.116.138214

PubMed ID:

28100512

Uncontrolled Keywords:

athletes; hypertriglyceridemia; intramyocellular lipids; lactate shuttle; muscle glycogen; recovery

BORIS DOI:

10.7892/boris.94562

URI:

https://boris.unibe.ch/id/eprint/94562

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