ULTRA SCIENCE

Methods & Testing

Assessments that help you decide what to measure, whether it is worth doing and what should change.

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7 answers

Hydration & heat

Sweat-rate field assessment

Estimate fluid loss in a specific session to rehearse a workable drinking plan.

Useful when conditions and measurement are controlled.

Evidence: Moderate

Fueling & gut tolerance

Race-fueling and GI rehearsal

Test whether your intended food, drinks and schedule work while running.

Useful; tolerance in training is informative but not a race guarantee.

Evidence: Moderate

Physiology & laboratory

Laboratory VO2max and watch estimates

Choose a test only if its result can change a training decision.

Lab testing is optional; a watch estimate is not interchangeable with it.

Evidence: Moderate

Field performance

Threshold assessment and critical speed

Define which threshold you mean before turning a result into a training zone.

Potentially useful with a defined protocol and interpretation.

Evidence: Moderate

Endurance durability

Aerobic decoupling and durability

Compare how a familiar effort changes as a run progresses, without turning drift into a diagnosis.

Useful as contextual monitoring; no universal pass mark.

Evidence: Limited

Recovery & readiness

Readiness, resting heart rate and HRV

Combine how you feel with consistent measurements before adjusting a session.

Useful as a pattern; no single score grants permission to train.

Evidence: Moderate

Hydration & heat

Is sweat-sodium testing worth doing?

Assess whether a sodium test would change a practical hydration decision.

Situation-dependent; a precise-looking result is not a complete hydration prescription.

Evidence: Moderate

How this library grows

This is an initial selection from an expandable inventory. Unpublished candidates are research gaps, not recommendations. Priorities combine decision impact, evidence, relevance, coverage gap and actionability.

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