Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study

Abstract Background Hydration status affects endurance performance. Pre-exercise hydration recommendations target the consumption of high carbohydrate and sodium beverages. Milk, due to its carbohydrate and sodium content, may be considered an effective pre-exercise hydration beverage. Purpose In a...

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Main Authors: Danniela García-Berger, Karen Mackay, Matias Monsalves-Alvarez, Carlos Jorquera, Rodrigo Ramirez-Campillo, Hermann Zbinden-Foncea, Mauricio Castro-Sepulveda
Format: Article
Language:English
Published: BMC 2020-03-01
Series:Journal of the International Society of Sports Nutrition
Subjects:
Online Access:http://link.springer.com/article/10.1186/s12970-020-00346-9
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spelling doaj-a7b40ce91c564e8f9d8fcb959e9bec872020-11-25T02:54:28ZengBMCJournal of the International Society of Sports Nutrition1550-27832020-03-011711510.1186/s12970-020-00346-9Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over studyDanniela García-Berger0Karen Mackay1Matias Monsalves-Alvarez2Carlos Jorquera3Rodrigo Ramirez-Campillo4Hermann Zbinden-Foncea5Mauricio Castro-Sepulveda6Nutrition and Exercise laboratory, Faculty of Medicine, Universidad MayorSchool of Exercise and Nutrition, Faculty of Health, Queensland University of TechnologyHuman Performance Laboratory, Motion Health & Performance CenterNutrition and Exercise laboratory, Faculty of Medicine, Universidad MayorLaboratory of Human Performance. Quality of Life and Wellness Research Group. Department of Physical Activity Sciences, Universidad de Los LagosExercise Science Laboratory, School of Kinesiology, Faculty of Medicine, Universidad Finis TerraeExercise Science Laboratory, School of Kinesiology, Faculty of Medicine, Universidad Finis TerraeAbstract Background Hydration status affects endurance performance. Pre-exercise hydration recommendations target the consumption of high carbohydrate and sodium beverages. Milk, due to its carbohydrate and sodium content, may be considered an effective pre-exercise hydration beverage. Purpose In a randomized cross-over trial, we compared the effects of an isotonic sport drink (SPD) with skim milk (SM) consumption before a race, on fluid homeostasis and time-trial performance in road cyclists. Methods Male road cyclists (n = 9; age, 26.8 ± 4.78 years) with 10.8 ± 8.56 years of experience in national competitions, consumed either SPD or SM in doses of 350 mL at 3 h and 350 mL at 1.5 h before a 18.6 km time-trial race. Measurements of body mass, urine specific gravity (USG), urine color and time-trial were compared between drinks (group; g) before and after the race (time; t). Results The two-way ANOVA showed no differences between SPD and SM in body mass (t, p < 0.0001; g, p = 0.89; t × g, p = 0.54), USG (t, p = 0.01; g, p = 0.63; t × g, p = 0.29) and urine color (t, p = 0.01; g, p = 0.54; t × g, p = 0.28) before or after race. Furthermore, no differences on water consumption during the race (p = 0.55) or time-trial performance (p = 0.84) were observed between trials. Conclusion Current results may help athletes with different beverages preferences to increase their options of hydration strategies.http://link.springer.com/article/10.1186/s12970-020-00346-9HydrationSport drinkMilkCyclistsEndurance sportUrine specific gravity
collection DOAJ
language English
format Article
sources DOAJ
author Danniela García-Berger
Karen Mackay
Matias Monsalves-Alvarez
Carlos Jorquera
Rodrigo Ramirez-Campillo
Hermann Zbinden-Foncea
Mauricio Castro-Sepulveda
spellingShingle Danniela García-Berger
Karen Mackay
Matias Monsalves-Alvarez
Carlos Jorquera
Rodrigo Ramirez-Campillo
Hermann Zbinden-Foncea
Mauricio Castro-Sepulveda
Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
Journal of the International Society of Sports Nutrition
Hydration
Sport drink
Milk
Cyclists
Endurance sport
Urine specific gravity
author_facet Danniela García-Berger
Karen Mackay
Matias Monsalves-Alvarez
Carlos Jorquera
Rodrigo Ramirez-Campillo
Hermann Zbinden-Foncea
Mauricio Castro-Sepulveda
author_sort Danniela García-Berger
title Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
title_short Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
title_full Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
title_fullStr Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
title_full_unstemmed Effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
title_sort effects of skim milk and isotonic drink consumption before exercise on fluid homeostasis and time-trial performance in cyclists: a randomized cross-over study
publisher BMC
series Journal of the International Society of Sports Nutrition
issn 1550-2783
publishDate 2020-03-01
description Abstract Background Hydration status affects endurance performance. Pre-exercise hydration recommendations target the consumption of high carbohydrate and sodium beverages. Milk, due to its carbohydrate and sodium content, may be considered an effective pre-exercise hydration beverage. Purpose In a randomized cross-over trial, we compared the effects of an isotonic sport drink (SPD) with skim milk (SM) consumption before a race, on fluid homeostasis and time-trial performance in road cyclists. Methods Male road cyclists (n = 9; age, 26.8 ± 4.78 years) with 10.8 ± 8.56 years of experience in national competitions, consumed either SPD or SM in doses of 350 mL at 3 h and 350 mL at 1.5 h before a 18.6 km time-trial race. Measurements of body mass, urine specific gravity (USG), urine color and time-trial were compared between drinks (group; g) before and after the race (time; t). Results The two-way ANOVA showed no differences between SPD and SM in body mass (t, p < 0.0001; g, p = 0.89; t × g, p = 0.54), USG (t, p = 0.01; g, p = 0.63; t × g, p = 0.29) and urine color (t, p = 0.01; g, p = 0.54; t × g, p = 0.28) before or after race. Furthermore, no differences on water consumption during the race (p = 0.55) or time-trial performance (p = 0.84) were observed between trials. Conclusion Current results may help athletes with different beverages preferences to increase their options of hydration strategies.
topic Hydration
Sport drink
Milk
Cyclists
Endurance sport
Urine specific gravity
url http://link.springer.com/article/10.1186/s12970-020-00346-9
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