direstraits: [Supertraining] Re: Post-Training Carb Sources

--- In Supertraining@yahoogroups.com, "Paul Rogers" <paulr99@...>
wrote:
>
> Miguel,
>
> It might even help. Fructose is thought to be a glucose 'signaller'
> (and then insulin) in small amounts. I'm not sure of the
evolutionary
> theory behind this, but the idea is that fructose says to the
> body: "get ready, here come the real carbs". (I did say 'small
> amounts'.)

*****
The below abstract may be relevant:

Superior endurance performance with ingestion of multiple
transportable carbohydrates.
Med Sci Sports Exerc. 2008 Feb;40(2):275-81.Links
Currell K, Jeukendrup AE.

INTRODUCTION:: The aim of the present study was to investigate the
effect of ingesting a glucose plus fructose drink compared with a
glucose-only drink (both delivering carbohydrate at a rate of 1.8
g.min) and a water placebo on endurance performance.

METHODS:: Eight male trained cyclists were recruited (age 32 +/- 7
yr, weight 84.4 +/- 6.9 kg, V O2max 64.7 +/- 3.9 mL.kg.min, Wmax 364
+/- 31 W). Subjects ingested either a water placebo (P), a glucose
(G)-only beverage (1.8 g.min), or a glucose and fructose (GF)
beverage in a 2:1 ratio (1.8 g.min) during 120 min of cycling
exercise at 55% Wmax followed by a time trial in which subjects had
to complete a set amount of work as quickly as possible (~1 h). Every
15 min, expired gases were analyzed and blood samples were collected.

RESULTS:: Ingestion of GF resulted in an 8% quicker time to
completion during the time trial (4022 s) compared with G (3641 s)
and a 19% improvement compared with W (3367 s). Total carbohydrate
(CHO) oxidation was not different between GF (2.54 +/- 0.25 g.min)
and G (2.50 g.min), suggesting that GF led to a sparing of endogenous
CHO stores, because GF has been shown to have a greater exogenous CHO
oxidation than G.

CONCLUSION:: Ingestion of GF led to an 8% improvement in cycling time-
trial performance compared with ingestion of G.

===================
Jamie Carruthers
Wakefield, UK

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