Protocol · graded by use, two uses
Aerobic exercise (Zone 2) 150 min/week
Measured VO2max The most oxygen the body can use during all-out exercise, a standard measure of aerobic fitness. after low-to-moderate intensity aerobic training, against no exercise.
Compare this record with another, side by side →
How this letter has changedLatest: October 2026 · Changed.
The protocol carried one A for both the training and the weekly dose in its name. The editor split it in October 2026. Measured VO2max after low-to-moderate intensity training keeps A: Gormley et al. (Med Sci Sports Exerc, 2008; PMID PubMed ID: the permanent number the US National Library of Medicine gives a published paper. Each one links to that paper's record on PubMed. 18580415), the DREW trial (Church et al., JAMA, 2007; PMID 17507344) and a 50-trial pooling (Nuuttila et al., 2026; PMID 41543030). The 150-minute weekly dose is C on its own row: only DREW's 136-minute arm comes near it, no other group has repeated it, and DREW found a steady dose response with no threshold (Arnold Sandlow, D.C.).PMID 17507344 PMID 18580415 PMID 41543030
The record rested on Gormley et al. (Med Sci Sports Exerc, 2008; PMID 18580415) alone. The replication The same finding reproduced by a separate research group. A result seen once can be chance or bias; a replicated one is harder to explain away. search found Church et al. (JAMA, 2007; PMID 17507344), the DREW trial, 464 sedentary women trained at 50 percent of peak VO2 for 6 months with a dose arm of 136 minutes a week, and Nuuttila et al. (Scand J Med Sci Sports, 2026; PMID 41543030), 50 pooled low-intensity trials. Replicated instrument-measured VO2max is A under the rule applied to VO2max training in October, and a B beside an A for the same evidence would have graded one fact two ways. Applied the written grade definition under the editor's standing instruction of October 2026 (Arnold Sandlow, D.C.).PMID 17507344 PMID 18580415 PMID 41543030
Every change to a letter on this site is dated and published. The full evidence log →
Zone 2 is steady aerobic exercise at a low to moderate effort. In studies by separate teams, healthy adults and inactive women past menopause who trained this way raised their fitness, measured as how much oxygen the body can use. A pooled review of 50 studies agreed. The 150 minutes a week in this page's name rests on one study arm of 136 minutes. In that study, more weekly minutes gave more gain, so 150 is not a cutoff. Links to fewer deaths come from studies that only watched people.
The A belongs to one of the two uses graded on this record. The other one carries its own letter.
This record carries a separate letter for each thing it has been measured on. The headline grade is the best of them, and it does not transfer to the others.
Gormley et al. (Med Sci Sports Exerc, 2008; PMID 18580415): the moderate arm at 50 percent of VO2 reserve raised VO2max 10.0 percent against a non-exercising control. Church et al. (JAMA, 2007; PMID 17507344), the DREW trial: peak oxygen consumption rose 4.2 to 8.2 percent across three weekly doses at 50 percent of peak VO2. Nuuttila et al. (Scand J Med Sci Sports, 2026; PMID 41543030) pool 50 randomized trials with intensity below the first lactate or ventilatory threshold and find a large effect. Instrument-measured VO2max, replicated by independent groups: A.
Only one randomized trial tested a dose near 150 minutes a week: the DREW trial's middle arm, 136 minutes (Church et al., JAMA, 2007; PMID 17507344), which no other group has repeated. The same trial found the gain rose steadily from 72 to 136 to 192 minutes, so nothing marks 150 minutes as a threshold or an optimum. A single unrepeated trial near the dose: C, by the editor's decision of October 2026.
Measured VO2max after low-to-moderate intensity aerobic training, against no exercise (A), replicated by independent groups and a 50-trial pooling. The 150-minute weekly dose in this protocol's name rests on one trial near that dose and is C on its own row.
Why this gradeThe reasoning, and what the grade does not cover.
Grade A by the instrument-measured function route: measured VO2max is a qualifying endpoint The outcome a trial measures to decide whether the treatment worked, such as heart attacks, blood pressure or a symptom score. under the written rule, and the gain from continuous aerobic training at Zone 2 intensity is replicated by independent groups. Gormley et al. (Med Sci Sports Exerc, 2008; PMID 18580415), Old Dominion University: the moderate-intensity arm at 50 percent of VO2 reserve raised VO2max 10.0 percent against a non-exercising control in 6 weeks. Church et al. (JAMA, 2007; PMID 17507344), the DREW trial at Pennington: 464 sedentary postmenopausal women trained at 50 percent of peak VO2 for 6 months; peak oxygen consumption rose 6.0 percent against control at 136 minutes a week, with 72 and 192 minutes giving 4.2 and 8.2 percent. Nuuttila et al. (Scand J Med Sci Sports, 2026; PMID 41543030) pool 50 randomized trials below the first threshold and find a large effect on VO2max. Moved from B in October 2026 by the written rule, the same basis as the VO2max training record. The editor divided this record in October 2026: the A covers the training, not the dose. The 150-minute weekly dose is graded C on its own row, because only the DREW trial's 136-minute arm comes near it.
WHAT THIS GRADE DOES NOT COVERmortality, where the evidence is observational Research that watches what people already do rather than assigning a treatment. It can show that two things travel together, not that one causes the other. (Kodama et al., JAMA, 2009; PMID 19454641) and carries no letter; the size of the gain, which is smaller at this intensity than with intervals; and any claim that 150 minutes is a threshold, since the DREW trial found a graded response across 72 to 192 minutes.
Shared endpoint: Measured VO2max after continuous aerobic training at or near Zone 2 intensity against a non-exercising control
- Old Dominion University, Norfolk, Virginia, USA (Gormley, Swain): VO2max rose 10.0 percent in the moderate-intensity arm (50 percent of VO2 reserve, 60 minutes four days a week) against a non-exercising control, 61 healthy adults, 6 weeks. PMID 18580415 · Funding: academic; no funding statement in the indexed record
- Pennington Biomedical Research Center, Baton Rouge, and the Cooper Institute, Dallas, USA (Church, Blair): Peak oxygen consumption rose 4.2, 6.0 and 8.2 percent against a non-exercise control at 72, 136 and 192 minutes a week at 50 percent of peak VO2, 464 sedentary postmenopausal women, 6 months. PMID 17507344 · Funding: National Heart, Lung, and Blood Institute (NIH)
What the replication does not cover: Both trials trained at about 50 percent of VO2 reserve or peak VO2, which is the low end of Zone 2; neither used a lactate or ventilatory threshold to set intensity. The DREW trial's middle dose, 136 minutes a week, is the closest match to 150 minutes a week; Gormley trained for 240 minutes a week. Nuuttila 2026 (PMID 41543030) pools 50 randomized trials below the first threshold and agrees. None of the trials reports a clinical event.
Shared endpoint: Measured VO2max after continuous aerobic training at or near Zone 2 intensity against a non-exercising control
- Old Dominion University, Norfolk, Virginia, USA (Gormley, Swain): VO2max rose 10.0 percent in the moderate-intensity arm (50 percent of VO2 reserve, 60 minutes four days a week) against a non-exercising control, 61 healthy adults, 6 weeks. PMID 18580415 · Funding: academic; no funding statement in the indexed record
- Pennington Biomedical Research Center, Baton Rouge, and the Cooper Institute, Dallas, USA (Church, Blair): Peak oxygen consumption rose 4.2, 6.0 and 8.2 percent against a non-exercise control at 72, 136 and 192 minutes a week at 50 percent of peak VO2, 464 sedentary postmenopausal women, 6 months. PMID 17507344 · Funding: National Heart, Lung, and Blood Institute (NIH)
What the replication does not cover: Both trials trained at about 50 percent of VO2 reserve or peak VO2, which is the low end of Zone 2; neither used a lactate or ventilatory threshold to set intensity. The DREW trial's middle dose, 136 minutes a week, is the closest match to 150 minutes a week; Gormley trained for 240 minutes a week. Nuuttila 2026 (PMID 41543030) pools 50 randomized trials below the first threshold and agrees. None of the trials reports a clinical event.
A grade describes the human evidence for a named use. It is not advice, and it is not a judgment on any individual prescription. How the letters are decided →
No prominent contraindication A condition or medication that makes a treatment unsafe or unsuitable for a particular person. at the intensities studied. Zone 2 is defined by staying below the intensity at which the caution would arise.
The evidence, in fullFour papers, each linked to its PubMed record.
Aerobic training reliably raises VO2max, an objectively measured functional outcome, in randomized trials; higher cardiorespiratory fitness predicts lower all-cause and cardiovascular mortality (Kodama et al., JAMA, 2009; PMID 19454641, prospective cohorts, context). Gormley et al. (Medicine and Science in Sports and Exercise, 2008; PMID 18580415) is a randomized dose-response trial: higher-intensity aerobic training produced greater VO2max gains than lower-intensity training at matched volume.
VO2max at baseline and every 12 weeks: field tests (12-minute Cooper test or 1.5-mile run) are acceptable proxies. Resting heart rate monthly as a secondary indicator of aerobic adaptation. Zone 2 training is occurring by verifying exercise is sustained at 60-70% of max heart rate with nasal breathing maintained.
Evidence notes: meta-analysis A study that pools the numbers from several trials into one combined estimate.
Endpoint graded: VO2max, objectively measured (functional)
Last reviewed: July 2026
Educational use only · Not medical advice · EBL grades published human evidence and does not recommend treatment. Stopping a prescription is a decision for your physician.
As studiedDose, form, population and duration for every use.
A grade describes the intervention that was tested. Where the product on the shelf differs from it, this says so.
Evidence Based Longevity, Inc. is owner-operated and edited by Arnold Sandlow, D.C., a California-licensed chiropractor. Evidence Based Longevity publishes in English only · Machine translations are not produced or reviewed by EBL for accuracy
© Evidence Based Longevity, Inc.. All rights reserved
These statements have not been evaluated by the Food and Drug Administration. Any grade on this page describes the strength of published human trial evidence in the populations studied. It is not a recommendation for any individual and is not medical advice. Starting, stopping or changing any supplement or medication is a decision for your physician.
How EBL searched for the trials (1 search)
The search that was run, what it returned, and what was left out and why, so the absence of evidence can be checked as well as its presence.
(VO2max[ti] OR "maximal oxygen uptake"[ti] OR "cardiorespiratory fitness"[ti]) AND (training[ti] OR exercise[ti]) AND randomized controlled trial[pt] AND (control[tiab] OR intensity[tiab]) AND (sedentary[tiab] OR untrained[tiab] OR healthy[tiab])Grades move when new trials publish. A free monthly email lists every grade EBL moved, with the reason and the trial behind it: the sign-up is on the Evidence Log →