Abstract：
:The purpose of this study was to determine the effect of carbohydrate ingestion before and during intense constant load cycling to volitional fatigue on surface electromyographic (sEMG) activity from the vastus lateralis (VL) and vastus medialis (VM) muscles. After 24-h diet and training control, 8 well-trained subjects (maximal O(2 )uptake (VO(2max )) 66+/- 2 ml. kg-1. min-1; mean plusmn; SD) ingested 8 ml. kg-1 of either a 6.4% carbohydrate-electrolyte (CHO) or a placebo (PLA) solution immediately before, followed by 2 ml. kg-1 of the same solution every 15 min while cycling to exhaustion at 84+/- 1% of VO(2max.) Exercise time to fatigue was 13% longer with CHO ingestion compared to PLA (58:54+/- 8:48 vs. 51: 18 +/- 5:54 min:s, NS). VO(2 ) (4.22 +/- 0.11 vs. 4.20 +/- 0.14 L. min-1 ), heart rate (172 +/- 4 vs. 176 +/- 4 beats. min-1), ratings of perceived effort (18 +/- 0.1 vs. 19+/- 0.1), and rates of carbohydrate oxidation (314 +/- 28 vs. 324 +/- 26 ?mol. kg-1. min -1) were similar for both PLA and CHO at exhaustion. There was no main treatment effect of CHO ingestion on blood glucose or lactate concentrations, nor plasma prolactin levels either during exercise or at fatigue. However, CHO ingestion attenuated the rise in EMG root mean square (RMS) activity during the latter stages (>45 min) of exercise and at the point of exhaustion for both VM (0.325 +/- 0.010 vs. 0.403 +/- 0.020 mV; =p.006) and VL (0.298+/- 0.011 vs. 0.370 +/- 0.007 mV; p =.0004). We conclude that in well-trained subjects, the ingestion of carbohydrate attenuated the increase in surface electromyographic activity during intense, constant load cycling leading to exhaustion in approximately 1 h. The precise mechanism(s) underlying this effect cannot be attributed to alterations in CHO availability but, instead, may be linked to changes in afferent sensory input.
journal_name
Int J Sport Nutr Exerc Metabauthors
Nikolopoulos V,Arkinstall MJ,Hawley JAdoi
10.1123/ijsnem.14.2.161keywords:
subject
Has Abstractpub_date
2004-04-01 00:00:00pages
161-70issue
2eissn
1526-484Xissn
1543-2742journal_volume
14pub_type
临床试验,杂志文章,随机对照试验abstract：AIMS/OBJECTIVES:To evaluate the current literature via systematic review to ascertain whether amino acids/vitamins provide any influence on musculotendinous healing and if so, by which physiological mechanisms. METHODS:EBSCO, PubMed, ScienceDirect, Embase Classic/Embase, and MEDLINE were searched using terms including...
journal_title：International journal of sport nutrition and exercise metabolism
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,随机对照试验
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pub_type： 杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章
doi：10.1123/ijsnem.2014-0012
更新日期：2014-08-01 00:00:00
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 临床试验,杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,评审
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更新日期：2010-04-01 00:00:00
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 临床试验,杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
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pub_type： 临床试验,杂志文章
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pub_type： 杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,随机对照试验
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journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章
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更新日期：2011-08-01 00:00:00
abstract：:To defend against hydrogen cation accumulation and muscle fatigue during exercise, sodium bicarbonate (NaHCO3) ingestion is commonplace. The individualized dose-response relationship between NaHCO3 ingestion and blood biochemistry is unclear. The present study investigated the bicarbonate, pH, base excess and sodium r...
journal_title：International journal of sport nutrition and exercise metabolism
pub_type： 杂志文章,随机对照试验
doi：10.1123/ijsnem.2015-0286
更新日期：2016-10-01 00:00:00
