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Can high-intensity interval training improve physical and mental health outcomes? Meta-review of 33 systematic reviews across the lifespan
Meta-review synthesising 33 systematic reviews (including 25 meta-analyses) concludes HIIT is associated with broad cardiometabolic, anthropometric, fitness, and select mental-health benefits versus non-active controls, with adherence commonly >80% and no acute injury signal in included reviews.
Design
- Type: meta-review (review of systematic reviews)
- Corpus: 33 systematic reviews (25 with meta-analyses) spanning healthy and clinical populations
- Comparator lenses: primarily non-active controls; some contrasts vs active controls reported in abstract
Directional outcome themes (vs non-active controls)
- Improved: cardiorespiratory fitness, anthropometrics, glycaemic control, arterial compliance / vascular function, cardiac function, heart rate, some inflammatory markers, exercise capacity, muscle mass
- Vs active controls: clearer signals for cardiorespiratory fitness, some inflammatory markers, muscle structure in abstract narrative
- Mental health: improvements in anxiety and depression severity reported vs pre-training in abstract summary
- Safety / adherence: no acute injuries flagged across reviews; mean adherence >80% in most included reviews per abstract
Evidence hygiene
- Synthesis-of-syntheses tier—use to orient readers on breadth, then drill into domain-specific RCT/meta-analysis rows (VO₂max, PSQI, etc.).
- Does not replace sleep-architecture polysomnography trials referenced on
higher-intensity-interval-training.
Publication
Martland R, Mondelli V, Gaughran F, Stubbs B. J Sports Sci. 2020 Feb;38(4):431-458. PMID 31889469.
Outcomes
- Meta-review of 33 systematic reviews: HIIT associated with improvements in cardiorespiratory fitness, anthropometrics, glycaemic markers, vascular function, cardiac function, exercise capacity, and muscle mass vs non-active controls (narrative synthesis).
- Abstract reports mean adherence >80% across most included reviews and no acute injury signal; calls for larger high-quality primary trials remain.