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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE EFFECTS OF SODIUM CITRATE INGESTION ON METABOLISM AND 1500-M RACING TIME IN TRAINED FEMALE RUNNERS |
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Vahur Ööpik  ,
Saima Timpmann, Kadri Kadak, Luule Medijainen and Kalle Karelson |
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Institute of Exercise Biology and Physiotherapy, Centre of Behavioural and Health Sciences, University of Tartu, Tartu, Estonia. |
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© Journal of Sports Science and Medicine (2008) 7, 125 - 131 Search Google Scholar for Citing Articles |
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| ABSTRACT | |||
| The purpose of the study was to assess the effects of sodium citrate
ingestion on the metabolic response to exercise and performance in a 1500-m
competitive run in trained female middle-distance runners in field conditions.
Seventeen athletes (mean (± SD) aged 18.6 ± 2.5 years, VO2max
55.2 ± 7.6 ml·kg-1·min-1) competed in two 1500-m races following
ingestion of 0.4 g·kg-1 body mass of sodium citrate (CIT) and placebo (PLC
- 1.0% solution of NaCl). The two substances, CIT and PLC were administered
in 800 ml of solution in a randomly assigned double-blind crossover manner.
Capillary blood samples were analysed for lactate, glucose, haemoglobin
and haematocrit before administering the solutions (baseline) as well as
before and after both 1500-m races. The athletes' times for trials CIT and
PLC were 321.4 ± 26.4 and 317.4 ± 22.5 s, respectively (p > 0.05). A
greater relative increase in plasma volume after administering the experimental
solution, an increased body mass (by 0.4 kg; p = 0.006) immediately before
the race and a restrained increase in blood glucose concentration (by 2.5
± 1.2 mmol·l-1 vs 3.4 ± 0.8 mmol·l-1; p = 0.002) during the race were observed
in the CIT trial compared to the PLC. A significant relationship was observed
between body mass of the subjects immediately before the race and performance
time (r = 0.374; p = 0.029). There were no between-treatment differences
in heart rate in any stage of the run or in blood lactate accumulation during
the race (final concentration of lactate was 14.4 ± 3.0 mmol·l-1 and 13.4
± 2.5 mmol·l-1 (p > 0.05) in the CIT and PLC trials, respectively). The
results suggest that sodium citrate induces an increase in water retention
before exercise and may modify carbohydrate metabolism in high intensity
running, but does not improve performance in 1500-m competitive run in female
middle-distance runners.
Key words: Middle-distance running, buffer ingestion, ergogenic aid. |
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