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

Nassif, Camila, Gomes, Aline Regina, Peixoto, Gustavo H.C., Chagas, Mauro Heleno, Soares, Danusa Dias, Silami-Garcia, Emerson, Drinkwater, Eric J., Cannon, Jack and Marino, Frank E. 2014, The effect of double - blind carbohydrate ingestion during 60 km of self-paced exercise in warm ambient conditions, PLoS one, vol. 9, no. 8, Article number: e104710, pp. 1-8, doi: 10.1371/journal.pone.0104710.

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Title The effect of double - blind carbohydrate ingestion during 60 km of self-paced exercise in warm ambient conditions
Author(s) Nassif, Camila
Gomes, Aline Regina
Peixoto, Gustavo H.C.
Chagas, Mauro Heleno
Soares, Danusa Dias
Silami-Garcia, Emerson
Drinkwater, Eric J.ORCID iD for Drinkwater, Eric J. orcid.org/0000-0002-9594-9360
Cannon, Jack
Marino, Frank E.
Journal name PLoS one
Volume number 9
Issue number 8
Season Article number: e104710
Start page 1
End page 8
Total pages 8
Publisher Public Library of Science (PLOS)
Place of publication San Francisco, Calif.
Publication date 2014-08-11
ISSN 1932-6203
Keyword(s) beverages
ingestion
electromyography
carbohydrates
glycogens
signal filtering
heart rate
humidity
Summary 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 130.26 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 - PLA c (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.
Language eng
DOI 10.1371/journal.pone.0104710
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082928

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.