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CURRENT ISSUETHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology


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The Journal of Sports Medicine and Physical Fitness 2000 December;40(4):343-9

 ORIGINAL ARTICLES

Com­par­ison of fruc­tose and glu­cose inges­tion ­before and during endu­rance ­cycling to exhaus­tion

Brundle S., Thayer R., Taylor A. W.

School of Kin­e­sio­logy and Depart­ment of ­Biology, Lake­head Uni­ver­sity, ­Thunder Bay, ­Ontario, ­Canada, Faculty of Kin­e­sio­logy, Uni­ver­sity of ­Western ­Ontario, ­London, ­Ontario, ­Canada

Back­ground. Pre-exer­cise and exer­cise inges­tion of fruc­tose and glu­cose ­during ­cycling exer­cise ­were com­pared.
­Methods. Experi­mental ­design: Sev­en­teen ­trained sub­jects ­ingested a pla­cebo ­prior to and ­during a ­cycling ­test to exhaus­tion at 75% VO2max (con­trol ­group = CG). One ­week ­later, sub­jects ­were ­matched on exer­cise ­time to exhaus­tion (ETE) and ­assigned to a fruc­tose ­group (FG) or a glu­cose ­group (GG). Sub­jects ­then per­formed a ­second ­cycling ­test to exhaus­tion, ­ingesting fruc­tose or glu­cose ­doses. For all ­groups (CG, FG and GG), ­blood was ­drawn ­before and at ­timed inter­vals ­during exer­cise to deter­mine glu­cose, lac­tate and ­free ­fatty ­acid (FFA) ­levels.
­Results. The ETE for CG was ­less ­than ­either FG (p<0.02) or GG (p<0.001) but FG and GG ­were sim­ilar. FG and GG did not ­show any dif­fer­ences in ­blood lac­tate or ­blood FFA ­during the ETE. How­ever, CG FFA ­levels ­were ­higher ­than ­those of FG (p<0.02) ­prior to exer­cise.
Con­clu­sions. ­This ­study dem­on­strated ­that fruc­tose and glu­cose are of ­equal ­value in pro­longing ETE in endu­rance ­cycling. ­Ingesting fruc­tose ­before and ­during exer­cise appar­ently pro­vided a ­more con­stant ­supply of glu­cose to be avail­able to the ­working mus­cles. The ­more ­stable ­blood glu­cose ­levels ­with fruc­tose inges­tion may be ben­e­fi­cial in ­reducing per­ceived exhaus­tion, and ­thereby ­allowing for an enhance­ment in exer­cise per­for­mance.

language: English


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