Outcome
Time to exhaustion
A lab outcome that can still guide training: it often tracks fatigue resistance.
What to do first
- • Build durability: long sessions + steady weekly volume.
- • Avoid stacking intensity when sleep is low.
- • Track drift: pace vs heart rate vs RPE over time.
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.
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.
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.
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).
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).
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).
Effect of respiratory muscle training on exercise performance in healthy individuals: a systematic review and meta-analysis.
PMID 22765281 (2012): respiratory — Time to exhaustion (study note for endurance athletes).
Hydration Status After an Ironman Triathlon: A Meta-Analysis.
PMID 31915479 (2019): hydration, dehydration — Time to exhaustion, Performance in heat, Cramp risk, Time-trial performance, Recovery speed (study note for endurance athletes).
Effects of caffeine supplementation on muscle endurance, maximum strength, and perceived exertion in adults submitted to strength training: a systematic review and meta-analyses.
PMID 32551869 (2021): caffeine — Time-trial performance, Time to exhaustion (study note for endurance athletes).
Caffeine and Bicarbonate for Speed. A Meta-Analysis of Legal Supplements Potential for Improving Intense Endurance Exercise Performance.
PMID 28536531 (2017): caffeine, nitrate — Time-trial performance, Time to exhaustion (study note for endurance athletes).
Effects of protein in combination with carbohydrate supplements on acute or repeat endurance exercise performance: a systematic review.
PMID 24343835 (2014): carbohydrate, carb — Time to exhaustion, Time-trial performance, Fat oxidation (study note for endurance athletes).
Effect of respiratory muscle training in asthma: A systematic review and meta-analysis.
PMID 35843501 (2023): inspiratory muscle training, respiratory — Time to exhaustion (study note for endurance athletes).
Nutritional Ergogenic Aids in Cycling: A Systematic Review.
PMID 38892701 (2024): caffeine, nitrate — Time-trial performance, Time to exhaustion (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.
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.
- The ergogenic effects of acute carbohydrate feeding on endurance performance: a systematic review, meta-analysis and meta-regression.
- Post-exercise Ingestion of Carbohydrate, Protein and Water: A Systematic Review and Meta-analysis for Effects on Subsequent Athletic Performance.
- Effect of respiratory muscle training on exercise performance in healthy individuals: a systematic review and meta-analysis.
- Hydration Status After an Ironman Triathlon: A Meta-Analysis.
- Effects of caffeine supplementation on muscle endurance, maximum strength, and perceived exertion in adults submitted to strength training: a systematic review and meta-analyses.