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One hour cycling performance is not affected by ingested fluid volume.

Karianne Backx1, Ken A van Someren, Garry S Palmer

  • 1School of Life Science, Kingston University, Kingston-upon-Thames, Surrey, KT1 1LQ, UK.

International Journal of Sport Nutrition and Exercise Metabolism
|December 13, 2003
PubMed
Summary

Consuming different fluid volumes during exercise does not impact cycling performance if a carbohydrate (CHO) solution is ingested beforehand. This finding applies to trained cyclists in a thermoneutral environment.

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Area of Science:

  • Exercise Physiology
  • Sports Nutrition

Background:

  • Fluid intake during exercise is crucial for performance.
  • Carbohydrate (CHO) solutions aid endurance exercise.
  • Optimal fluid volumes for cyclists in thermoneutral conditions require further investigation.

Purpose of the Study:

  • To investigate the effect of varying fluid volumes on cycling time-trial (TT) performance.
  • To determine if pre-exercise carbohydrate intake mitigates fluid volume effects.
  • To assess physiological responses and subjective feelings of stomach fullness.

Main Methods:

  • Eight male cyclists completed four 1-h self-paced TTs.
  • Trials involved a pre-exercise CHO bolus (6 ml/kg BM) followed by high (300 ml), moderate (150 ml), or low (40 ml) fluid intake during exercise.

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  • Power output, heart rate, and stomach fullness were monitored; body mass loss was calculated.

    • Main Results:

    • No significant differences in TT performance or physiological variables (heart rate, body mass loss) were observed between fluid intake conditions.
    • Higher fluid volumes (HF and MF) led to greater feelings of stomach fullness compared to low fluid intake (LF).

    Conclusions:

    • Pre-exercise carbohydrate intake appears to negate the impact of varying fluid volumes on 1-hour cycling TT performance in thermoneutral conditions.
    • Fluid volume manipulation did not alter performance despite affecting subjective stomach fullness.