CHO Oxidation from a CHO Gel Compared with a Drink during Exercise

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Abstract

Purpose:

To investigate exogenous CHO oxidation from CHO provided in semisolid (GEL) or solution (DRINK) form during cycling.

Methods:

Eight well-trained cyclists (age = 34 ± 7 yr, mass = 76 ± 9 kg, V˙O2max = 61 ± 7 mL·kg−1·min−1) performed three exercise trials in random order. The trials consisted of cycling at 59% ± 4% V˙O2max for 180 min while receiving one of the following three treatments: GEL plus plain water, DRINK, or plain water. Both CHO treatments delivered GLU plus FRC in a ratio of 2:1 at a rate of 1.8 g·min−1 (108 g·h−1). Fluid intake was matched between treatments at 867 mL·h−1.

Results:

Exogenous CHO oxidation from GEL and DRINK showed a similar time course, with peak exogenous CHO oxidation rates being reached at the end of the 180-min exercise. Peak exogenous CHO oxidation rates were not significantly different (P = 0.40) between GEL and DRINK (1.44 ± 0.29 vs 1.42 ± 0.23 g·min−1, respectively). Furthermore, oxidation efficiency was not significantly different (P = 0.36) between GEL and DRINK (71% ± 15% vs 69% ± 13%, respectively).

Conclusions:

This study demonstrates that a GLU + FRC mixture is oxidized to the same degree when administered as either semisolid GEL or liquid DRINK, leading to similarly high peak oxidation rates and oxidation efficiencies.

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