General fitness, health and nutrition · Public discussion

Re: Carbo loading fails to improve endurance exercise performance

Started by Donovan Rebbechi · · Last activity · 2 posts · 246 views

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General fitness, health and nutrition
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1 October 2004
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1 October 2004
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Donovan Rebbechi
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  1. Ignoramus4980 said:

    (9 g CHO kg body mass1 day1) or placebo-controlled moderate-CHO diet
    (6 g CHO kg body mass1 day1).

    That's not what *you* would call "moderate carb" though, it's 420gm carb.

    Quoted message said:

    A CHO breakfast (2 g CHO/kg body mass)

    Again, that's a big, high carb breakfast

    Quoted message said:

    was consumed 2 h before each TT, and a CHO drink (1 g CHO kg.body
    mass1 h1) was consumed during the TTs to optimize CHO availability. The

    .... and a big high carb drink for a total of 3gm CHO/kg bodyweight, or about
    210gm of carb for breakfast for a 154lb cyclist.

    Quoted message said:

    100-km TT was interspersed with four 4-km and five 1-km sprints. CHO
    loading significantly increased muscle glycogen concentrations (572 107
    vs. 485 128 mmol/kg dry wt for CHO loading and placebo, respectively; P <
    0.05). Total muscle glycogen utilization did not differ between trials,
    nor did time to complete the TTs (147.5 10.0 and 149.1 11.0 min; P =
    0.4) or the mean power output during the TTs (259 40 and 253 40 W, P =
    0.4). This placebo-controlled study shows that CHO loading did not improve
    performance of a 100-km cycling TT during which CHO was consumed. By
    preventing any fall in blood glucose concentration, CHO ingestion during
    exercise may offset any detrimental effects on performance of lower
    preexercise muscle and liver glycogen concentrations.

    All this tells us is that both groups were consuming huge amounts of carbs.

    I don't see how this study has much relevance to you, unless you're planning
    on taking in 6gm CHO per kg body weight, *AND* consume carbs during the race.

    Cheers,
    --
    Donovan Rebbechi
    http://pegasus.rutgers.edu/~elflord/

  2. Ignoramus4980 said:


    What's interesting in this study is that there is a lack of
    dose-response in our reaction to "carbo loading", in that, at least
    above a certain level, increasing carbs does not increase performance.

    No, what it actually said was that consuming substantial amounts of
    carbos just before and during exercise appeared to offset the deficit
    in muscle glycogen concentration that the placebo group suffered.

    In other words, it suggests that consuming a high carbo breakfast and
    continuing with high carbo intake during exercise can offset the
    advantage of a more traditional carbo-loading method.

    That is interesting, but it certainly doesn't support any of your low
    carbo rantings.

    An interesting follow-up to that test would be to see what happened if
    neither group was allowed the pre-exercise carbos or carbos during the
    exercise. One can speculate that the group with the initial higher
    muscle glycogen concentration just might outperform the other.

    Mike Tennent
    "IronPenguin"

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