Zone 2 aerobic training prescription

The underlying intervention is one of the best-evidenced things in the longevity field, but the branded framing is not. Regular aerobic exercise raising cardiorespiratory fitness has extensive human RCT and large prospective cohort support for reduced all-cause and cardiovascular mortality, and VO2 max is among the strongest single predictors of mortality risk. That is the clinical layer, and it is real. What the evidence does NOT show is the specific claim doing the marketing work: that Zone 2 in particular is uniquely or optimally longevity-promoting compared with other aerobic intensities. Head-to-head trials of moderate-intensity continuous training versus higher-intensity interval training generally show interval work produces equal or greater VO2 max improvement for less time, and no trial has randomised people to zone-2-specific versus intensity-matched-alternative prescriptions with a healthspan or mortality endpoint. The mitochondrial biogenesis and fat-oxidation rationale for zone 2 is mechanistic and physiological, extrapolated from exercise-physiology substrate-utilisation data rather than from outcome trials. Total weekly aerobic volume, and simply doing the exercise consistently, are almost certainly the operative variables rather than precision zone targeting. Practical caveat for the clinic offering: the value added by a paid VO2 max test is zone precision, and for most people zone 2 can be approximated by the talk test at far lower cost. Graded "clinical" for aerobic training improving fitness and mortality risk; the zone-2-uniqueness layer is mechanism only. Note on completeness: this profile's clinic and dose claims were each verified by opening the pages cited; the regulatory framing was not verified against live HSA or TGA sources in this session because the search budget was exhausted, so it is stated as a category judgement rather than a retrieved finding.

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