Outcome
Time-trial performance
Practical performance outcome used in many studies: closer to racing than lab-only metrics.
What to do first
- • Use pacing rules and negative-split practice in training.
- • Add one weekly session that targets your event intensity.
- • Practice race-day fueling and hydration on key sessions.
Related topic guides
Protocols and decisions connected to this outcome.
Caffeine for endurance performance: a practical protocol
Evidence-informed protocol: Caffeine for endurance performance: a practical protocol. Practical steps, who it helps, and what to watch out for.
Heat acclimation: a protocol you can actually execute
Evidence-informed protocol: Heat acclimation: a protocol you can actually execute. Practical steps, who it helps, and what to watch out for.
Carbohydrate fueling for long runs: a protocol you can practice
Evidence-informed protocol: Carbohydrate fueling for long runs: a protocol you can practice. Practical steps, who it helps, and what to watch out for.
Tapering for an endurance race: a simple protocol
Evidence-informed protocol: Tapering for an endurance race: a simple protocol. Practical steps, who it helps, and what to watch out for.
HYROX performance research: what aspiring athletes can use
Evidence-informed protocol: HYROX performance research: what aspiring athletes can use. Practical steps, who it helps, and what to watch out for.
Long-course triathlon research: pacing, fueling and readiness
Evidence-informed protocol: Long-course triathlon research: pacing, fueling and readiness. Practical steps, who it helps, and what to watch out for.
Study library (reference)
Studies that measured this outcome.
Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis.
PMID 36615805 (2022): caffeine — Time-trial performance, Time to exhaustion (study note for endurance athletes).
Carbohydrate ingestion during endurance exercise improves performance in adults.
PMID 21411610 (2011): carbohydrate, carb — Time to exhaustion, Time-trial performance, Fat oxidation (study note for endurance athletes).
Ergogenic effects of supplement combinations on endurance performance: a systematic review and meta-analysis of randomized controlled trials.
PMID 40619880 (2025): caffeine, bicarbonate — Time-trial performance, Time to exhaustion (study note for endurance athletes).
Effect of Pre-Exercise Caffeine Intake on Endurance Performance and Core Temperature Regulation During Exercise in the Heat: A Systematic Review with Meta-Analysis.
PMID 35616851 (2022): caffeine — Time-trial performance (study note for endurance athletes).
Short-term heat acclimation training improves physical performance: a systematic review, and exploration of physiological adaptations and application for team sports.
PMID 24817609 (2014): heat acclimation — Performance in heat, Time-trial performance (study note for endurance athletes).
Comparative Effects of Pacing Strategies on Endurance Performance: A Systematic Review and Network Meta-Analysis.
PMID 41313565 (2026): pacing — Time-trial performance (study note for endurance athletes).
Head, Face, and Neck Cooling for Performance: A Systematic Review and Meta-Analysis.
PMID 40355096 (2025): head, face — Time-trial performance (study note for endurance athletes).
Effects of Caffeine Dose and Administration Method on Time-Trial Performance: A Systematic Review and Network Meta-Analysis.
PMID 41374083 (2025): caffeine, dose — Time-trial performance (study note for endurance athletes).
The ergogenic effects of acute carbohydrate feeding on endurance performance: a systematic review, meta-analysis and meta-regression.
PMID 37449467 (2024): carbohydrate, carb — Time to exhaustion, Time-trial performance, Fat oxidation (study note for endurance athletes).
Effects of tapering on performance in endurance athletes: A systematic review and meta-analysis.
PMID 37163550 (2023): taper, tapering — Time-trial performance, Recovery speed (study note for endurance athletes).
Post-exercise Ingestion of Carbohydrate, Protein and Water: A Systematic Review and Meta-analysis for Effects on Subsequent Athletic Performance.
PMID 29098657 (2018): carbohydrate, carb — Time to exhaustion, Time-trial performance, Fat oxidation (study note for endurance athletes).
The Effect of Natural or Simulated Altitude Training on High-Intensity Intermittent Running Performance in Team-Sport Athletes: A Meta-Analysis.
PMID 29129021 (2018): altitude, hypoxia — VO₂max, Time-trial performance (study note for endurance athletes).
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Performance Science Lab
Research summaries for endurance athletes, with study context, practical protocols, and clear limitations.
HYROX performance research: what aspiring athletes can use
Evidence-informed protocol: HYROX performance research: what aspiring athletes can use. Practical steps, who it helps, and what to watch out for.
Long-course triathlon research: pacing, fueling and readiness
Evidence-informed protocol: Long-course triathlon research: pacing, fueling and readiness. Practical steps, who it helps, and what to watch out for.
Sources
- Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis.
- Carbohydrate ingestion during endurance exercise improves performance in adults.
- Ergogenic effects of supplement combinations on endurance performance: a systematic review and meta-analysis of randomized controlled trials.
- Effect of Pre-Exercise Caffeine Intake on Endurance Performance and Core Temperature Regulation During Exercise in the Heat: A Systematic Review with Meta-Analysis.
- Short-term heat acclimation training improves physical performance: a systematic review, and exploration of physiological adaptations and application for team sports.
- Comparative Effects of Pacing Strategies on Endurance Performance: A Systematic Review and Network Meta-Analysis.
- Head, Face, and Neck Cooling for Performance: A Systematic Review and Meta-Analysis.
- Effects of Caffeine Dose and Administration Method on Time-Trial Performance: A Systematic Review and Network Meta-Analysis.