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The effect of double--blind carbohydrate ingestion during 60 km of self-paced exercise in warm ambient conditions.

Nassif C, Gomes AR, Peixoto GH, Chagas MH, Soares DD, Silami-Garcia E, Drinkwater EJ, Cannon J, Marino FE - PLoS ONE (2014)

Bottom Line: This study evaluated double blind ingestions of placebo (PLA) versus 6% carbohydrate (CHO) either as capsules (c) or beverage (b) during 60 km self-paced cycling in the heat (32°C and 50% relative humidity).Effect size (Cohen's d) for time was only moderate when comparing CHOb - PLAb (d = 0.68) and PLAb - PLAc (d = 0.57) whereas all other ES were 'trivial' to 'small'.We conclude that CHO ingestion is of little or no benefit as a beverage compared with placebo during 60 km TT in the heat.

View Article: PubMed Central - PubMed

Affiliation: School of Human Movement Studies, Charles Sturt University, Bathurst, New South Wales, Australia.

ABSTRACT
This study evaluated double blind ingestions of placebo (PLA) versus 6% carbohydrate (CHO) either as capsules (c) or beverage (b) during 60 km self-paced cycling in the heat (32°C and 50% relative humidity). Ten well-trained males (mean ± SD: 26±3 years; 64.5±7.7 kg and 70.7±8.8 ml.kg-1.min-1 maximal oxygen consumption) completed four separate 60 km time trials (TT) punctuated by 1 km sprints (14, 29, 44, 59 km) whilst ingesting either PLAb or PLAc or CHOb or CHOc. The TT was not different among treatments (PLAb 130.2±11.2 min, CHOb 140.5±18.1 min, PLAc 143.1±29.2 min, CHOc 137.3±20.1 min; P>0.05). Effect size (Cohen's d) for time was only moderate when comparing CHOb - PLAb (d = 0.68) and PLAb - PLAc (d = 0.57) whereas all other ES were 'trivial' to 'small'. Mean speed throughout the trial was significantly higher for PLAb only (P<0.05). Power output was only different (P<0.05) between the sprints and low intensity efforts within and across conditions. Core and mean skin temperatures were similar among trials. We conclude that CHO ingestion is of little or no benefit as a beverage compared with placebo during 60 km TT in the heat.

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Related in: MedlinePlus

Time to complete the 60 km time trial for each condition.PLA is placebo and CHO is carbohydrate; b and c denote beverage and capsule conditions, respectively.
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pone-0104710-g001: Time to complete the 60 km time trial for each condition.PLA is placebo and CHO is carbohydrate; b and c denote beverage and capsule conditions, respectively.

Mentions: The times to complete the 60 km TT were not different among conditions (P = 0.32; see Figure 1). The ES for each of the combination of PLA and CHO trials are shown in Table 1. The ES for time taken to complete 60 km ranged from 0.1–0.7 indicating ‘trivial’ to ‘moderate’ effect amongst conditions.


The effect of double--blind carbohydrate ingestion during 60 km of self-paced exercise in warm ambient conditions.

Nassif C, Gomes AR, Peixoto GH, Chagas MH, Soares DD, Silami-Garcia E, Drinkwater EJ, Cannon J, Marino FE - PLoS ONE (2014)

Time to complete the 60 km time trial for each condition.PLA is placebo and CHO is carbohydrate; b and c denote beverage and capsule conditions, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4128743&req=5

pone-0104710-g001: Time to complete the 60 km time trial for each condition.PLA is placebo and CHO is carbohydrate; b and c denote beverage and capsule conditions, respectively.
Mentions: The times to complete the 60 km TT were not different among conditions (P = 0.32; see Figure 1). The ES for each of the combination of PLA and CHO trials are shown in Table 1. The ES for time taken to complete 60 km ranged from 0.1–0.7 indicating ‘trivial’ to ‘moderate’ effect amongst conditions.

Bottom Line: This study evaluated double blind ingestions of placebo (PLA) versus 6% carbohydrate (CHO) either as capsules (c) or beverage (b) during 60 km self-paced cycling in the heat (32°C and 50% relative humidity).Effect size (Cohen's d) for time was only moderate when comparing CHOb - PLAb (d = 0.68) and PLAb - PLAc (d = 0.57) whereas all other ES were 'trivial' to 'small'.We conclude that CHO ingestion is of little or no benefit as a beverage compared with placebo during 60 km TT in the heat.

View Article: PubMed Central - PubMed

Affiliation: School of Human Movement Studies, Charles Sturt University, Bathurst, New South Wales, Australia.

ABSTRACT
This study evaluated double blind ingestions of placebo (PLA) versus 6% carbohydrate (CHO) either as capsules (c) or beverage (b) during 60 km self-paced cycling in the heat (32°C and 50% relative humidity). Ten well-trained males (mean ± SD: 26±3 years; 64.5±7.7 kg and 70.7±8.8 ml.kg-1.min-1 maximal oxygen consumption) completed four separate 60 km time trials (TT) punctuated by 1 km sprints (14, 29, 44, 59 km) whilst ingesting either PLAb or PLAc or CHOb or CHOc. The TT was not different among treatments (PLAb 130.2±11.2 min, CHOb 140.5±18.1 min, PLAc 143.1±29.2 min, CHOc 137.3±20.1 min; P>0.05). Effect size (Cohen's d) for time was only moderate when comparing CHOb - PLAb (d = 0.68) and PLAb - PLAc (d = 0.57) whereas all other ES were 'trivial' to 'small'. Mean speed throughout the trial was significantly higher for PLAb only (P<0.05). Power output was only different (P<0.05) between the sprints and low intensity efforts within and across conditions. Core and mean skin temperatures were similar among trials. We conclude that CHO ingestion is of little or no benefit as a beverage compared with placebo during 60 km TT in the heat.

Show MeSH
Related in: MedlinePlus