Performance research spans cognition, recovery, training, and the interventions studied for each. Below: what the published research describes.
Laboratory VO2 max testing directly measures oxygen consumption during exercise. Wearables estimate it from heart rate and pace data. This page describes the methods and the accuracy gap.
11 min read · 2026-06-01 Training researchControlled trials have compared HIIT and moderate-intensity continuous training across VO2 max, metabolic outcomes, body composition, and adherence. This page describes what each comparison has actually measured.
11 min read · 2026-06-01 Recovery scienceRecovery is multi-dimensional — different physiological systems recover on different timescales. This page describes what research has measured about recovery processes, HRV-based scores, and the role of sleep.
11 min read · 2026-06-01 Performance measurementHRV is the variation in time between consecutive heartbeats. It reflects autonomic nervous system balance. This page describes what HRV measures, how wearables calculate it, and where the science is strongest.
11 min read · 2026-06-01 Training researchZone 2 training drives mitochondrial biogenesis and supports fat oxidation. It dominates elite endurance training programs. This page describes the physiology research and where consumer claims outrun the evidence.
11 min read · 2026-06-01What ten performance interventions actually do, ranked by measured effect size. Resistance training, sleep, Zone 2, HIIT, sauna, recovery, and the ones where popular framing outruns the evidence.
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