Study note — O’Keefe et al. 2023 (Mo Med training strategies)
Shelf: Siim-cited
Full-text access: Yes — open on PMC (HTML full text).
Fetched 2026-09-18 from https://pmc.ncbi.nlm.nih.gov/articles/PMC10121111/ · PMID 37091937.
Siim site link: this is the exact (R) href next to his “2023 systematic review” moderate-vs-vigorous mortality paragraph on siimland.co/my-longevity-routine (verified scrape 2026-09-18).
Labels: [Paper] = stated in the article · [Inference] = our take for Product / Zone 2.
Citation
O’Keefe JH, O’Keefe EL, Eckert R, Lavie CJ.
Training Strategies to Optimize Cardiovascular Durability and Life Expectancy.
Missouri Medicine. 2023 Mar–Apr;120(2):155–162.
PMID 37091937 · PMC PMC10121111
(PubMed publication types include Systematic Review / Meta-Analysis / Journal Article; body is a narrative systematic review of 2011–2022 PubMed literature, not a new pooled meta-analysis of primary effect sizes.)
Methods [Paper]
- Design: Systematic review of PubMed studies 2011–2022 on fitness and/or exercise dose/type vs CV health and/or life expectancy; preferential use of recent meta-analyses and large long-term prospective cohorts.
- No new primary cohort and no original pooled HR table generated by the authors for moderate vs vigorous minutes.
Key results (numbers) [Paper]
Centered on Lee DH et al. Circulation 2022 (their ref 2; our note Lee 2022):
- Relationships of dose to death risk differ for VPA vs MPA.
- Very high MPA reduced CVD and all-cause mortality substantially better than very high VPA (their Figure 1A/1B discussion).
- Mortality reductions maximized at ~150 min/week of VPA; doses >150 min/week VPA → plateau in all-cause mortality and a modest progressive loss of CVD mortality reduction (slight reverse-J).
- MPA showed dose-dependent inverse relationships — higher MPA → fewer deaths in the follow-up they discuss.
- Later prose: chronically doing very high doses of moderate exercise reduced all-cause and CVD mortality risks at least two-fold better than chronically doing very high doses of vigorous exercise (their reading of Lee).
- Separate threads in the same article (CRF METs, strength-training J-curve, balance, sit-rise, play/dogs) are out of scope for our Zone 2 mortality framing.
Limitations / catch [Paper] + [Inference]
- Narrative synthesis of others’ epidemiology — not a new RCT and not a de novo dose–response meta with extractable −17% / −35% cells.
- Heavily interpretive of Lee 2022 figures; wording like “at least two-fold better” is authors’ synthesis, not a single Lee table cell we can paste.
- Observational base (Lee) → residual confounding, self-report PA, reverse causation risk.
- Does not prescribe Zone 2 HR bands or 2×/week session doses — longevity framing for intensity mix only.
What we take for Zone 2 [Inference]
- Supports keeping a substantial moderate-intensity aerobic lane even when someone already does hard intervals / lifting — matches our “Zone 2 beside HIT, not instead of it” synthesis.
- Supports the idea that vigorous volume plateaus for mortality benefit while moderate volume keeps helping (directionally).
- Does not by itself lock Siim’s session recipe (60–70% HRmax × 45–60 min × 2/week).
vs Siim’s use
| Siim (site) | Paper |
|---|---|
| Calls it a “2023 systematic review” | [Paper] PubMed types include Systematic Review; content is narrative SR — genre match OK |
| More moderate → lower ACM; vigorous plateaus; moderate keeps helping at high weekly volumes | [Paper] Same direction via Lee discussion (~150 min/wk VPA plateau; MPA dose-dependent) |
| “−17% vs −35%” | Not found as those exact percentages in the O’Keefe full text we read |
| Plateau after “200 minutes/week” vigorous | O’Keefe text centers on “~150 minutes/week” VPA (Lee’s near-max band is broader, ~150–300) — Partial |
| “800 min/week better than 200 min/week” moderate | Not found as that exact contrast in O’Keefe; Lee discusses continued MPA benefit through higher categories (e.g. 300–599) with ≥600 similar to 300–599 — Partial / Siim framing |
Match to Siim claim: Partial — this is his (R), direction matches, exact −17/−35 and 200/800 numbers not verified in full text.
Paywall note
Not paywalled via PMC HTML for this pass.