Research
Metabolic adaptation
The real effect of carbohydrate was a slight reduction in power of 0.3%.
Carbohydrate supplementation may not provide the expected ergogenic benefit and could slightly reduce performance.
StrongRefutesmedium confidence
The real effect of carbohydrate was a slight reduction in power of 0.3%.
Why this rating
Based on study design from abstract.
Source
Placebo effect of carbohydrate feedings during a 40-km cycling time trial
V. R. Clark et al. · Medicine & Science in Sports & Exercise · 2000
DOI 10.1097/00005768-200009000-00019
rct · n=43Cited 186×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- The placebo effect of a potentially ergogenic treatment during unblinded laboratory time trials lasting approximately 1 hour is probably a small but worthwhile increase in endurance power.Strong
- Blinding subjects to the treatment increases individual differences in endurance effort, which may reduce precision of performance outcomes in controlled trials.Strong
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