WRITTEN BY Frederick W. Sabido, MBA; Editor: Frederick L.H. Sabido, MD, FACS
Welcome to The Wellness Ledger
A weekly health led newsletter grounded in evidence-based medicine along with prospective randomized controlled trials by medical specialists. Our goal is to help you make sense of complex scientific information and turn it into clear, evidenced based practices you can use to make better decisions about your health and wellness.
TL;DR: THREE THINGS WORTH YOUR ATTENTION
VO2 max outperforms cholesterol as a mortality predictor.
A Cleveland Clinic study of 122,007 adults found that moving from the lowest to the highest fitness category was associated with an 80% reduction in all-cause mortality risk. That gap was larger than the mortality risk from smoking, coronary artery disease, and diabetes combined. More on this later.
Mandsager et al., JAMA Network Open, 2018. PMID: 30646252
Failing a 10-second balance test in your 50s predicts death better than most blood panels.
A 2022 BJSM study found that those who could not stand on one leg for 10 seconds had an 84% higher risk of dying within 7 years, after adjusting for all major chronic conditions.
Araujo et al., British Journal of Sports Medicine, 2022. PMID: 35728834
1 to 2 sets per exercise, done 2 to 3 times a week, is enough to preserve muscle mass.
The maintenance dose for lean mass is far lower than most people think. Volume matters less than intensity at low frequencies. Consistency at near-failure effort is what holds the line against sarcopenia.
Grgic et al., Frontiers in Physiology, 2018. Ralston et al., J Strength Cond Res, 2017.
THE METRIC YOUR DOCTOR PROBABLY NEVER MEASURED
You probably had your cholesterol checked at your last physical.
Your doctor scanned the numbers. Maybe flagged the LDL. Possibly mentioned diet. You left with a printout and a vague sense that you should eat less saturated fat.
Here is what did not happen. Nobody measured the single most powerful predictor of mortality over the next decade. It takes 12 minutes on a treadmill. It does not require a blood draw. The data behind it is stronger than almost anything else in longevity medicine.
It is called VO2 max. And if you have never heard of it, you are not alone.
That is exactly the problem.
DEEP DIVE: WHAT VO2 MAX ACTUALLY MEASURES
VO2 max is the maximum volume of oxygen your body can absorb, transport, and use during maximal effort exercise. Measured in millilitres of oxygen per kilogram of body weight per minute (mL/kg/min).
Think of it this way. Your lungs pull oxygen in from the air. Your heart pumps it through the blood. Your muscles use it to generate energy. VO2 max is the ceiling on that entire system. A high ceiling means your heart, lungs, and muscles are working efficiently together. A low ceiling means the system is struggling, even when you feel fine at rest.
VO2 max is not a lung test.
It measures the entire chain: pulmonary function, cardiac output, blood vessel health, and how well your mitochondria actually consume oxygen at the cellular level. A declining VO2 max is a sign that multiple systems are aging at once.
WHAT THE DATA ACTUALLY SHOWS
In 2018, researchers at the Cleveland Clinic published a study in JAMA Network Open. They followed 122,007 adults over a median of 8.4 years. Each person completed a treadmill fitness test. Researchers divided them into five fitness groups: Low, Below Average, Above Average, High, and Elite.
The findings were hard to ignore.
To put that in context: in the same dataset, coronary artery disease increased mortality risk by 29%. Smoking increased it by 41%. Diabetes increased it by 40%.
Low cardiorespiratory fitness increased mortality risk by more than all three combined.
There was no ceiling effect, meaning the differences in the study were measurable. A 2024 meta-analysis in the British Journal of Sports Medicine confirmed that physical activity up to 600 minutes per week continued to drive cardiovascular mortality risk downward. No paradoxical U-shaped harm curve appeared in healthy populations.
Source: Mandsager et al., JAMA Network Open, 2018 (PMID: 30646252). Kokkinos et al., JACC, 2022 (PMID: 35926933). Yu et al., British Journal of Sports Medicine, 2024.
HOW FAST VO2 MAX FALLS, AND WHY THAT IS MOSTLY PREVENTABLE
Most people assume VO2 max declines because of aging. The truth is more specific, and more actionable.
Historical data suggested a 10% decline per decade after age 30. Longitudinal studies tracking the same individuals over time tell a different story. Among masters athletes who maintain training volume, the decline is far slower. Regression analyses show that between 39% (in women) and 54% (in men) of VO2 max decline is explained not by biological aging but by reductions in training stimulus.
Important context
A person who stops exercising entirely can lose up to 20% of their VO2 max in 12 weeks, nullifying years of adaptation. True biological aging accounts for roughly a 5% decline per decade in consistently active people. The larger drop most experience in their 40s and 50s is largely preventable.
HOW TO ACTUALLY IMPROVE IT
Two training approaches dominate the longevity fitness conversation. You have probably heard of both, but the evidence on each is often misrepresented.
Zone 2 training refers to steady, low-intensity cardio where you can hold a conversation: roughly 60 to 75% of maximum heart rate, staying below your lactate threshold. Zone 2 is real and its cardiovascular benefits are documented. For most adults with limited time, however, it is not the most efficient route to moving VO2 max.
High-intensity interval training (HIIT) is shorter, harder, and for time-constrained adults, better evidenced for directly raising VO2 max. A 2025 meta-analysis published in PMC confirmed that HIIT produces significantly greater improvements in cardiopulmonary fitness than moderate-intensity continuous training, particularly in sedentary populations.
The minimum effective regimen
For a sedentary adult in their 40s: two HIIT sessions per week. A practical format: four rounds of four minutes at above 85% of maximum heart rate, with three minutes of active recovery between rounds. Roughly 30 minutes of actual work per session.
Within 8 to 12 weeks: realistic VO2 max improvements of 10 to 30% are achievable.
Honest caveat: if you are sedentary, unconditioned, or over 45 with no recent medical evaluation, the ACSM and AHA recommend completing a Physical Activity Readiness Questionnaire (PAR-Q) before beginning HIIT. Screening for latent cardiovascular risk matters at this intensity. HIIT is safe for the vast majority of adults, but not for everyone without a check-in first.
THE MUSCLE PILLAR: WHY GRIP STRENGTH PREDICTS DEATH
VO2 max keeps you alive. Muscle mass keeps you independent.
Starting around age 35, skeletal muscle mass begins a slow, measurable decline. A 47-year longitudinal Swedish study confirmed this starts earlier than most people expect: roughly 3.7% reduction in muscle and bone structures per decade during the 35 to 50 window. After age 50, the decline accelerates: leg lean mass drops by 1 to 2% per year, and muscular strength falls by 1.5 to 3% annually.
The clinical name is sarcopenia. The European Working Group on Sarcopenia in Older People (EWGSOP2) defines probable sarcopenia as grip strength below 27 kg for men or 16 kg for women, confirmed by low muscle mass on a DXA scan.
Why does grip strength matter to someone in their 40s?
Because it is the most studied whole-body strength proxy in longevity research. The PURE study, published in The Lancet in 2015, tracked 139,691 adults across 17 countries over a median of 4 years.
To build new muscle: 4 sets per muscle group per week is the minimum regimen for a detectable increase in muscle cross-sectional area. Optimal hypertrophy requires 5 to 10 sets per muscle group per week.
To hold on to what you have: 1 to 2 sets per exercise, 2 to 3 times per week, is highly effective for maintaining strength and lean mass. The critical variable is intensity. Each set must be taken close to muscular failure (an RPE of 7 to 9 out of 10… RPE means the Rate of Perceived Exertion).
Resistance training also builds bone. Meta-analyses show approximately 0.64% improvement in hip bone mineral density and 0.62% improvement in lumbar spine BMD (Bone Mineral Density) from structured resistance training. Starting before your mid-50s maximises peak bone mass before the accelerated breakdown that follows.
THE BALANCE PILLAR: THE TEST ALMOST NOBODY TAKES SERIOUSLY
Most people who think about longevity fitness focus on cardio and strength. Almost nobody includes balance.
In 2022, Dr. Claudio Gil Araujo and colleagues published a study in the British Journal of Sports Medicine. They evaluated 1,702 adults between ages 51 and 75. About 20% of the cohort could not complete a 10-second one-legged stance.
This is not a fall study.
None of the deaths in the follow-up were attributed to falling. The 10-second balance test appears to function as a compressed marker of overall systemic health: neuromuscular control, microvascular integrity, and peripheral nervous system function, all in one 10-second window.
Balance starts declining in the fifth decade of life, not in old age. Healthy adults in their 30s and 40s typically hold a one-legged stance for a full minute. By age 50, the average duration drops to 45 seconds. By age 70, it falls to 28 seconds.
The training investment is genuinely small. Stand on one leg while brushing your teeth. Walk heel-to-toe along a line. Dedicate 15 to 30 minutes per week to structured balance work. Tai Ji Quan interventions show 31 to 58% reductions in fall incidence across RCTs. The neuromuscular calibration this builds matters far earlier than most people start it.
THE PROTOCOL: THREE PILLARS, ONE REALISTIC SCHEDULE
Training for longevity does not require a second job. The combined evidence points to roughly 3.5 to 5 hours per week, distributed across three types of training.
Cardiorespiratory (HIIT)
Action: 2 sessions/week. 4 rounds of 4 min at >85% max heart rate, 3 min active recovery between rounds.
Primary benefit: VO2 max elevation, mitochondrial density
Evidence: Tier 1 (RCT meta-analysis)
Resistance Training
Action: 2-3 sessions/week. Min. 4 sets per major muscle group/week for growth. 1-2 sets to near-failure for maintenance.
Primary benefit: Lean mass preservation, bone mineral density, metabolic health
Evidence: Tier 1 (RCT meta-analysis)
Balance and Proprioception
Action: Daily integration (one-legged stances while doing tasks), or 15-30 min/week of structured balance work.
Primary benefit: Fall prevention, neuromuscular calibration, CNS integrity
Evidence: Tier 1 for fall outcomes. Tier 2 for mortality link.
About the WHO 2020 guidelines
World Health Organization recommends 150-300 minutes of moderate activity, or 75-150 of vigorous activity, per week, plus strength work twice a week. These thresholds were designed to lift populations out of severe sedentary pathology. They do not optimize longevity. They specify no intensity thresholds for VO2 max improvement. They say nothing about balance training for adults under 65. Use them as a floor, not a ceiling.
ONE MORE THING: THE CASE FOR MIXING IT UP
A 2026 study from the Harvard T.H. Chan School of Public Health tracked 111,000 adults over 30 years. People who engaged in the highest variety of exercise types (mixing walking, lifting, swimming, tennis, yoga) had a 19% lower risk of premature death than those who trained with the lowest variety, even when total activity volume was held equal between groups.
The takeaway: the body needs diverse stimuli. Variety across mechanical, metabolic, and neurological demands may be as important as total volume. Rigid adherence to one modality, however rigorously applied, appears to miss something the body needs.
Source: Hu et al., BMJ Medicine, 2026. Via Harvard T.H. Chan School of Public Health news release.
READER'S PULSE
If you feel safe enough and are physically capable to do so, try the test right now. Stand on one leg. No holding anything. Can you hold 10 seconds on both sides?
Which leg was harder? Reply and tell us. We are tracking whether balance asymmetry (a bigger difference between legs) is as meaningful as raw duration. We will share what the pattern looks like in the next issue.
Quick Check
What does research say is most effective for raising VO2 max in a time-constrained sedentary adult?
3 NUMBERS TO SAVE
Sources: Mandsager K et al. JAMA Netw Open 2018;1(6):e183605. PMID: 30646252. Kokkinos P et al. J Am Coll Cardiol 2022;80(6):598-609. PMID: 35926933. Leong DP et al. Lancet 2015;386(9990):266-73. PMID: 25982160. Araujo CG et al. Br J Sports Med 2022;56(17):975-980. PMID: 35728834. Cruz-Jentoft AJ et al. (EWGSOP2). Age Ageing 2019;48(1):16-31. PMID: 30312372. Hu et al. BMJ Medicine 2026. ACSM Guidelines for Exercise Testing and Prescription, 11th Edition. Yu et al. Br J Sports Med 2024. AHA/ACSM PAR-Q screening recommendations.
Medical disclaimer: This newsletter is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before beginning any new exercise program, particularly high-intensity training.
