Self-selecting Fluid Intake while Maintaining High Carbohydrate Availability Does not Impair Half-marathon Performance

被引:22
作者
Lee, M. J. C. [1 ]
Hammond, K. M. [1 ]
Vasdev, A. [1 ]
Poole, K. L. [1 ]
Impey, S. G. [1 ]
Close, G. L. [1 ]
Morton, J. P. [1 ]
机构
[1] Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 6AF, Merseyside, England
关键词
glucose; fructose; dehydration; running; endurance; EXERCISE-INDUCED DEHYDRATION; BODY WATER-CONTENT; PROLONGED EXERCISE; ENDURANCE PERFORMANCE; GLYCOGEN UTILIZATION; WEIGHT CHANGES; CHO OXIDATION; DRINKING; TIME; INGESTION;
D O I
10.1055/s-0034-1375635
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
We aimed to test the hypothesis that self-selecting fluid intake but maintaining high exogenous CHO availability (60g/h) does not compromise half-marathon performance. 15 participants completed 3 half-marathons while drinking a 6% CHO solution to guidelines (DRINK) or a non-caloric solution in self-selected volumes when consuming 3xglucose (20g) gels (G-GEL) or glucose-fructose (13g glucose+7g fructose) gels (GF-GEL) per hour. Fluid intake (DRINK: 1557 +/- 182, G-GEL: 473 +/- 234, GF-GEL: 404 +/- 144ml) and percent body mass loss (DRINK: -0.8 +/- 0.9, G-GEL: -2.0 +/- 0.6, GF-GEL: -2.3 +/- 1.1) were different (P<0.05) between conditions, though race time did not differ (DRINK: 110.6 +/- 14.4, G-GEL: 110.3 +/- 14.6, GF-GEL: 113.7 +/- 12.8min). In G-GEL, there was a positive correlation (P<0.05) between body mass loss and race time. Plasma glucose was lower (P<0.05) in GF-GEL compared with other conditions, and total CHO oxidation (DRINK: 3.2 +/- 0.5, G-GEL: 3.0 +/- 0.4, GF-GEL: 2.6 +/- 0.4g/min) was lower (P=0.06) in this trial. Self-selecting fluid intake but maintaining high CHO availability does not impair half-marathon performance. Additionally, consuming glucose-fructose mixtures in sub-optimal amounts reduces plasma glucose and total rates of CHO oxidation.
引用
收藏
页码:1216 / 1222
页数:7
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