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Siim Land@siimlandX

The 8 core longevity tests everyone should track: 1️⃣ VO₂ max → cardiorespiratory fitness and systemic health 2️⃣ Resting heart rate (RHR)

what it claims

Siim Land suggests tracking 8 key longevity markers, including VO₂ max, resting heart rate (RHR), heart rate variability (HRV), and grip strength, to assess and monitor one's systemic health.

holds up

These indicators are widely supported by observational research as predictors of overall health and mortality.

noli's read

These indicators are widely supported by observational research as predictors of overall health and mortality. Grip strength, for example, is recognized in major studies (such as the PURE study published in The Lancet) as a powerful marker of muscle mass and neuromuscular function, sometimes surpassing blood pressure in predicting death risk. VO₂ max is also an established indicator of cardiorespiratory health strongly correlated with a reduced risk of mortality. Regarding HRV and RHR, research confirms they reflect the state of the autonomic nervous system and cardiac resilience. However, it is important to note that these measurements are indirect reflections and not medical diagnoses; their utility lies in tracking long-term trends rather than interpreting isolated data points. While the idea of tracking these metrics is scientifically grounded, potential exaggeration lies in the promise that they constitute a complete 'dashboard' for longevity, as they do not replace in-depth biological or medical monitoring.

the sources

  1. 1Mandsager K, Harb S, Cremer P, Phelan D, Nissen SE, Jaber W 2018
  2. 2Leong DP, Teo KK, Rangarajan S, et al. (PURE) 2015
  3. 3Celis-Morales CA, Welsh P, Lyall DM, et al. 2018

Claimed by Siim Land. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Evidence
B

Linked to, not proven to cause.

Effect
all-cause mortality by cardiorespiratory fitness (treadmill METs) — elite vs low fitness adjusted HR 0.20 (95% CI 0.16-0.24); mortality inversely proportional to fitness with no upper limit of benefit; n=122,007
Measured on
adults referred for exercise treadmill testing (single large health system)

What’s uncertain

The fitness-mortality link is observational and drawn from patients referred for treadmill testing, so it shows strong association, not proof of cause. Dramatic comparisons (e.g. 'more dangerous than smoking') are rhetorical, not precise.

Siim Land in the Register50 claims graded · solidity 79/100See their record →

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