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Effects of commbined sago-soy supplementation on cycling time trial performance in the heat

The effects of carbohydrate intake and a combination of carbohydrate and protein intake on endurance performance have been studied by many researchers with equivocal findings. In this study, local food products such as sago starch (containing 88% carbohydrate) and a soy–protein isolate (containin...

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Main Author: Tarmast, Daniel
Format: Thesis
Language:English
Published: 2016
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RJ Pediatrics
Online Access:http://eprints.usm.my/41729/1/Dr._Daniel_Tarmast-24_pages.pdf
http://eprints.usm.my/41729/
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spelling my.usm.eprints.41729 http://eprints.usm.my/41729/ Effects of commbined sago-soy supplementation on cycling time trial performance in the heat Tarmast, Daniel RJ Pediatrics The effects of carbohydrate intake and a combination of carbohydrate and protein intake on endurance performance have been studied by many researchers with equivocal findings. In this study, local food products such as sago starch (containing 88% carbohydrate) and a soy–protein isolate (containing amino acids) has been used. The purpose of the current study was to examine the effects of sago, soy, and iso–caloric combination of sago+soy supplementations during 90 minutes steady–state cycling at 60 % VO2max, on a subsequent 20–km cycling time trial performance in the heat (~31 °C; 70 % relative humidity). Twelve well–trained male cyclists (age: 19.0 ± 5.6 years, body weight: 60.1 ± 11.2 kg, height: 170.8 ± 7.6 cm, and VO2max: 56.5 ± 6.5 mL.kg-1.min-1) representing Kelantan (state level) cycling team were recruited for this randomised single–blind placebo– controlled crossover study. Following preliminary trials, to investigate the VO2max and to determine workload of the steady–state cycling, participants performed four experimental trials. The experimental trials consisted of a 90–minute steady–state pedalling at 60 % of VO2max, followed by a 20–km cycling time trial. From the beginning of the experimental trials and at 20–minute intervals during the steady–state cycling (0, 20, 40, 60, and 80 minutes), participants consumed 200 mL of either: 7.5 % Sago, 7.5 % Soy, 6.0 % Sago + 1.5 % Soy, or placebo. No significant differences were found in time–to–complete the 20–km time trial regardless of the drink ingested (p > 0.05). Metabolic responses including plasma concentrations of glucose and insulin were increased during the steady–state cycling in the sago and sago+soy trials compared with soy and placebo trials. At the end of the 20–km cycling time trial, the plasma lactate concentration was increased significantly in all trials (p < 0.001), and the plasma free fatty acids concentration was significantly higher in the placebo and soy trials than the sago and sago+soy trials (p < 0.001). There were no significant differences between the trials in plasma concentrations of creatine kinase and F2– Isoprostanes after the experimental trials (p > 0.05). The present study demonstrated that ingestion of sago, soy, and iso–caloric sago+soy combined supplementation did not improve the 20–km cycling time trial performance in the heat despite the availability of a higher level of plasma glucose and insulin. Hence, carbohydrate alone or a carbohydrate+protein combined supplementation may not be beneficial in exercise performance, specifically in the heat. 2016-05 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/41729/1/Dr._Daniel_Tarmast-24_pages.pdf Tarmast, Daniel (2016) Effects of commbined sago-soy supplementation on cycling time trial performance in the heat. PhD thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic RJ Pediatrics
spellingShingle RJ Pediatrics
Tarmast, Daniel
Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
description The effects of carbohydrate intake and a combination of carbohydrate and protein intake on endurance performance have been studied by many researchers with equivocal findings. In this study, local food products such as sago starch (containing 88% carbohydrate) and a soy–protein isolate (containing amino acids) has been used. The purpose of the current study was to examine the effects of sago, soy, and iso–caloric combination of sago+soy supplementations during 90 minutes steady–state cycling at 60 % VO2max, on a subsequent 20–km cycling time trial performance in the heat (~31 °C; 70 % relative humidity). Twelve well–trained male cyclists (age: 19.0 ± 5.6 years, body weight: 60.1 ± 11.2 kg, height: 170.8 ± 7.6 cm, and VO2max: 56.5 ± 6.5 mL.kg-1.min-1) representing Kelantan (state level) cycling team were recruited for this randomised single–blind placebo– controlled crossover study. Following preliminary trials, to investigate the VO2max and to determine workload of the steady–state cycling, participants performed four experimental trials. The experimental trials consisted of a 90–minute steady–state pedalling at 60 % of VO2max, followed by a 20–km cycling time trial. From the beginning of the experimental trials and at 20–minute intervals during the steady–state cycling (0, 20, 40, 60, and 80 minutes), participants consumed 200 mL of either: 7.5 % Sago, 7.5 % Soy, 6.0 % Sago + 1.5 % Soy, or placebo. No significant differences were found in time–to–complete the 20–km time trial regardless of the drink ingested (p > 0.05). Metabolic responses including plasma concentrations of glucose and insulin were increased during the steady–state cycling in the sago and sago+soy trials compared with soy and placebo trials. At the end of the 20–km cycling time trial, the plasma lactate concentration was increased significantly in all trials (p < 0.001), and the plasma free fatty acids concentration was significantly higher in the placebo and soy trials than the sago and sago+soy trials (p < 0.001). There were no significant differences between the trials in plasma concentrations of creatine kinase and F2– Isoprostanes after the experimental trials (p > 0.05). The present study demonstrated that ingestion of sago, soy, and iso–caloric sago+soy combined supplementation did not improve the 20–km cycling time trial performance in the heat despite the availability of a higher level of plasma glucose and insulin. Hence, carbohydrate alone or a carbohydrate+protein combined supplementation may not be beneficial in exercise performance, specifically in the heat.
format Thesis
author Tarmast, Daniel
author_facet Tarmast, Daniel
author_sort Tarmast, Daniel
title Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
title_short Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
title_full Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
title_fullStr Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
title_full_unstemmed Effects of commbined sago-soy supplementation on cycling time trial performance in the heat
title_sort effects of commbined sago-soy supplementation on cycling time trial performance in the heat
publishDate 2016
url http://eprints.usm.my/41729/1/Dr._Daniel_Tarmast-24_pages.pdf
http://eprints.usm.my/41729/
_version_ 1643710304886980608
score 13.211869

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