Research
Mixed
Untrained individuals may experience greater improvements in maximal oxygen uptake (VO2max) from protein supplementation during endurance training compared to trained individuals.
If you are new to endurance training, adding protein supplements might help slightly improve your maximum oxygen uptake (VO2max). This benefit is likely not present if you are already a trained endurance athlete.
GoodQualifiesMEDIUM confidence
While the overall impact on maximal oxygen uptake (VO2max) was not significant, subgroup analysis revealed that untrained individuals may experience greater improvements in VO2max with protein supplementation (SMD = 0.21).
Why this rating
Derived from subgroup analysis of a high-quality meta-analysis.
Source
Effects of protein supplementation on body composition, physiological adaptations, and performance during endurance training: a systematic review and meta-analysis
Yang Xiao et al. · Frontiers in Nutrition · 2025
DOI 10.3389/fnut.2025.1663860
Meta-analysis · 23 studiesCited 2×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
Related findings · Mixed
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