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Carbohydrate Mouth Rinsing Enhances High Intensity Time Trial Performance Following Prolonged Cycling

View Article: PubMed Central - PubMed

ABSTRACT

There is good evidence that mouth rinsing with carbohydrate (CHO) solutions can enhance endurance performance (≥30 min). The impact of a CHO mouth rinse on sprint performance has been less consistent, suggesting that CHO may confer benefits in conditions of ‘metabolic strain’. To test this hypothesis, the current study examined the impact of late-exercise mouth rinsing on sprint performance. Secondly, we investigated the effects of a protein mouth rinse (PRO) on performance. Eight trained male cyclists participated in three trials consisting of 120 min of constant-load cycling (55% Wmax) followed by a 30 km computer-simulated time trial, during which only water was provided. Following 15 min of muscle function assessment, 10 min of constant-load cycling (3 min at 35% Wmax, 7 min at 55% Wmax) was performed. This was immediately followed by a 2 km time trial. Subjects rinsed with 25 mL of CHO, PRO, or placebo (PLA) at min 5:00 and 14:30 of the 15 min muscle function phase, and min 8:00 of the 10-min constant-load cycling. Magnitude-based inferential statistics were used to analyze the effects of the mouth rinse on 2-km time trial performance and the following physiological parameters: Maximum Voluntary Contract (MVC), Rating of Perceived Exertion (RPE), Heart Rate (HR), and blood glucose levels. The primary finding was that CHO ‘likely’ enhanced performance vs. PLA (3.8%), whereas differences between PRO and PLA were unclear (0.4%). These data demonstrate that late-race performance is enhanced by a CHO rinse, but not PRO, under challenging metabolic conditions. More data should be acquired before this strategy is recommended for the later stages of cycling competition under more practical conditions, such as when carbohydrates are supplemented throughout the preceding minutes/hours of exercise.

No MeSH data available.


Effect of CHO and PRO mouth rinses on 2 km time trial (TT) Performance. Circles represent mean treatment difference compared to placebo. Bars depict 90% confidence interval. Shaded area notates threshold value for smallest meaningful effect. * ‘Likely’ faster than PLA.
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nutrients-08-00576-f002: Effect of CHO and PRO mouth rinses on 2 km time trial (TT) Performance. Circles represent mean treatment difference compared to placebo. Bars depict 90% confidence interval. Shaded area notates threshold value for smallest meaningful effect. * ‘Likely’ faster than PLA.

Mentions: CHO MR ‘likely’ enhanced the 2 km TT performance by 3.8% ± 4.7% (p = 0.11) compared to PLA, whereas the comparison between PRO vs. PLA was ‘unclear’ (0.4% ± 5.6%; p = 0.91). The 2 km TT data are displayed in Table 2 and Figure 2.


Carbohydrate Mouth Rinsing Enhances High Intensity Time Trial Performance Following Prolonged Cycling
Effect of CHO and PRO mouth rinses on 2 km time trial (TT) Performance. Circles represent mean treatment difference compared to placebo. Bars depict 90% confidence interval. Shaded area notates threshold value for smallest meaningful effect. * ‘Likely’ faster than PLA.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037560&req=5

nutrients-08-00576-f002: Effect of CHO and PRO mouth rinses on 2 km time trial (TT) Performance. Circles represent mean treatment difference compared to placebo. Bars depict 90% confidence interval. Shaded area notates threshold value for smallest meaningful effect. * ‘Likely’ faster than PLA.
Mentions: CHO MR ‘likely’ enhanced the 2 km TT performance by 3.8% ± 4.7% (p = 0.11) compared to PLA, whereas the comparison between PRO vs. PLA was ‘unclear’ (0.4% ± 5.6%; p = 0.91). The 2 km TT data are displayed in Table 2 and Figure 2.

View Article: PubMed Central - PubMed

ABSTRACT

There is good evidence that mouth rinsing with carbohydrate (CHO) solutions can enhance endurance performance (≥30 min). The impact of a CHO mouth rinse on sprint performance has been less consistent, suggesting that CHO may confer benefits in conditions of ‘metabolic strain’. To test this hypothesis, the current study examined the impact of late-exercise mouth rinsing on sprint performance. Secondly, we investigated the effects of a protein mouth rinse (PRO) on performance. Eight trained male cyclists participated in three trials consisting of 120 min of constant-load cycling (55% Wmax) followed by a 30 km computer-simulated time trial, during which only water was provided. Following 15 min of muscle function assessment, 10 min of constant-load cycling (3 min at 35% Wmax, 7 min at 55% Wmax) was performed. This was immediately followed by a 2 km time trial. Subjects rinsed with 25 mL of CHO, PRO, or placebo (PLA) at min 5:00 and 14:30 of the 15 min muscle function phase, and min 8:00 of the 10-min constant-load cycling. Magnitude-based inferential statistics were used to analyze the effects of the mouth rinse on 2-km time trial performance and the following physiological parameters: Maximum Voluntary Contract (MVC), Rating of Perceived Exertion (RPE), Heart Rate (HR), and blood glucose levels. The primary finding was that CHO ‘likely’ enhanced performance vs. PLA (3.8%), whereas differences between PRO and PLA were unclear (0.4%). These data demonstrate that late-race performance is enhanced by a CHO rinse, but not PRO, under challenging metabolic conditions. More data should be acquired before this strategy is recommended for the later stages of cycling competition under more practical conditions, such as when carbohydrates are supplemented throughout the preceding minutes/hours of exercise.

No MeSH data available.