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BMJ Paediatr Open. 2017 Oct 25;1(1):e000075. doi: 10.1136/bmjpo-2017-000075. eCollection 2017.

Swim drink study: a randomised controlled trial of during-exercise rehydration and swimming performance.

Author information

1
Paediatric Gastroenterology, Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, UK.
2
Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, UK.
3
Community Paediatrics, Child Development Centre, Bury St Edmunds, UK.
4
West Suffolk Swimming Club, Bury St Edmunds, UK.
5
Neurology, Addenbrooke's Hospital, Cambridge, UK.

Abstract

Objective:

To determine whether during-exercise rehydration improves swimming performance and whether sports drink or water have differential effects on performance.

Design:

Randomised controlled multiple crossover trial.

Setting:

A UK competitive swimming club.

Subjects:

19 club-level competitive swimmers, median age (range) 13 (11-17) years.

Interventions:

Subjects were scheduled to drink ad libitum commercial isotonic sports drink (3.9 g sugars and 0.13 g salt per 100 mL) or water (three sessions each) or no drink (six sessions) in the course of twelve 75 min training sessions, each of which was followed by a 30 min test set of ten 100 m maximum-effort freestyle sprints each starting at 3 min intervals.

Main outcome measure:

Times for the middle 50 m of each sprint measured using electronic timing equipment in a Federation Internationale de Natation (FINA)-compliant six-lane 25 m competition swimming pool.

Randomisation:

Software-generated individual random session order in sealed envelopes. Analysis subset of eight sessions randomly selected by software after data collection completed.

Masking:

Participants blind to drink allocation until session start.

Results:

In the analysis data set of 1118 swims, there was no significant difference between swim times for drinking and not drinking nor between drinking water or a sports drink. Mean (SEM) 50 m time for no-drink swims was 38.077 (0.128) s and 38.105 (0.131) s for drink swims, p=0.701. Mean 50 m times were 38.031 (0.184) s for drinking sports drink and 38.182 (0.186) s for drinking water, p=0.073. Times after not drinking were 0.027 s faster than after drinking (95% CI 0.186 s faster to 0.113 s slower). Times after drinking sports drink were 0.151 s faster than after water (95% CI 0.309 s faster to 0.002 s slower). Mean (SEM) dehydration from exercise was 0.42 (0.11)%.

Conclusions:

Drinking water or sports drink over 105 min of sustained effort swimming training does not improve swimming performance.

Trial registration:

ISRCTN: 49860006.

KEYWORDS:

adolescent health; exercise physiology; nutrition

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