Does resting heart rate matter for longevity?

Yes. A lower resting heart rate generally reflects a stronger, more efficient heart. For most adults, 55–65 bpm is healthy; above 80 bpm signals room to improve aerobic fitness.

Fitness Age & VO2 Max Estimator — Longevity Score Calculator

Q: Is this as accurate as a lab VO2 max test?

No — this is a validated estimate, typically within 10–15% of a laboratory treadmill test. Best used to track your trend over time.

Q: How do I actually raise my VO2 max?

A combination of Zone-2 base building (3–5 sessions/week at your Zone-2 HR) and occasional high-intensity intervals. Consistency over months matters most. Expect 10–15% improvement in 8–12 weeks.

Q: What's a good VO2 max for my age?

Scoring 'Excellent' (10–30% above the population average for your age and sex) is associated with meaningfully lower mortality risk. See the gauge and reference table for your specific age band.

VO2 Max Estimate

VO2 max — · —

Fitness Age

—

years old

Longevity Score

VO2 max—

Resting HR—

Grip strength—

Activity level—

Zone 2 Heart Rate (Karvonen)

— – — bpm

Zone 2 is a conversational pace — you can talk but not sing. ~150 min/week here builds the aerobic base that drives VO2 max.

Max HR (Tanaka): — bpm · Formula: 208 − 0.7 × age

⌚

What VO2 Max Is and Why It Predicts Longevity

VO2 max is the maximum rate at which your body can consume oxygen during sustained exercise, expressed in millilitres per kilogram of body weight per minute (mL/kg/min). It reflects the integrated capacity of your heart, lungs, blood, and working muscles working together. Crucially, it is the strongest single predictor of all-cause mortality that researchers have identified — people with low cardiorespiratory fitness face roughly 2–5× higher risk of early death compared to those with high fitness. VO2 max declines approximately 10% per decade after age 30 in sedentary individuals, but that decline is largely modifiable with consistent aerobic training, especially Zone-2 work.

How We Estimate Your VO2 Max Without a Treadmill

We use the validated Jackson/NASA non-exercise estimation equation, based on self-reported physical activity, age, BMI, and sex. The coefficients are:

VO2max = 56.363 + 1.921 × PAR − 0.381 × age − 0.754 × BMI + 10.987 × sex
(sex: male = 1, female = 0; PAR = Physical Activity Rating 0–7)

Worked example: Male, age 40, BMI 25, PA-R 3 →
56.363 + (1.921 × 3) − (0.381 × 40) − (0.754 × 25) + (10.987 × 1)
= 56.363 + 5.763 − 15.24 − 18.85 + 10.987 = 39.0 mL/kg/min

Non-exercise estimates are typically within ~10–15% of a treadmill lab test. Treat this as a calibrated ballpark and a trend tracker, not a diagnosis. The formula is best used to monitor change over months as your fitness improves.

Fitness Age Explained

Your fitness age is not your birth certificate — it is the chronological age at which the population average VO2 max matches your estimated value. A fit 50-year-old with a VO2 max of 44 mL/kg/min has the cardiovascular fitness of an average person in their mid-30s. This is a motivating and honest metric: it shows where you stand relative to the population and, more importantly, that fitness age can be moved backwards with consistent training. Researchers at NTNU (Norway) have published extensively on this concept, sometimes called "fitness age," showing it predicts mortality independently of chronological age.

Zone 2 — The Training That Moves the Needle

Zone 2 is the heart-rate training zone where you burn primarily fat for fuel, stimulate the greatest density of new mitochondria (the energy factories in your muscle cells), and build the aerobic base that underpins VO2 max. The target is roughly 60–70% of your Heart Rate Reserve (Karvonen formula), using the more accurate Tanaka max-HR equation (208 − 0.7 × age) rather than the older 220 − age.

The practical test: you should be able to hold a full conversation but not sing. A brisk walk for deconditioned individuals, a jog for most, a hard run for elite athletes. Most longevity-focused protocols recommend accumulating 150+ minutes per week in this zone. Consistency over months — not intensity — is what raises VO2 max for the majority of people.

Grip Strength: The Cheapest Longevity Test

Handgrip strength measured with a $20–30 dynamometer is one of the most studied, and surprisingly powerful, predictors of frailty and all-cause mortality. Large cohort studies (including the PURE study of 140,000+ adults across 17 countries) consistently find that grip strength predicts cardiovascular death, respiratory disease, and cancer mortality independently of other risk factors. Low grip strength is an early signal of sarcopenia (age-related muscle loss), which accelerates after 50. The good news: resistance training — squats, deadlifts, rows, even consistent carry work — directly and rapidly improves grip and whole-body strength.

VO2 Max by Age and Sex — Reference Table

Age band	Male avg (mL/kg/min)	Female avg (mL/kg/min)
20–29	48	38
30–39	44	35
40–49	40	32
50–59	36	29
60–69	32	26
70–79	28	23

Get the Free 8-Week Zone-2 Starter Plan (PDF)

Weekly training schedule, HR targets, and progress tracker — totally free.

Frequently Asked Questions

Is this as accurate as a lab VO2 max test? +

No — this is a validated estimate, not a measurement. Non-exercise equations are typically within 10–15% of a laboratory treadmill test. The best use of this tool is tracking your trend over time: if your estimated VO2 max improves after 8–12 weeks of consistent Zone-2 training, that's a meaningful signal even if the absolute number is approximate.

How do I actually raise my VO2 max? +

The most effective protocol for most people is a combination of (1) Zone-2 base building — 3–5 sessions per week, 30–60 min each at your Zone-2 HR range — and (2) occasional high-intensity intervals (1–2 sessions/week of 4×4 min at 85–95% max HR). Consistency over months matters far more than any single workout. VO2 max typically improves 10–15% within 8–12 weeks of structured training in untrained individuals, and continues to rise with sustained effort.

What's a good VO2 max for my age? +

See the reference table above or the gauge categories. As a rough guide: scoring "Good/Average" (within ±10% of population average) is adequate; "Excellent" (10–30% above average) is associated with meaningfully lower mortality risk; "Superior" (30%+ above average) is where longevity research shows the largest survival benefits. The goal is progression, not perfection.

Does resting heart rate matter? +

Yes. A lower resting heart rate generally reflects a stronger, more efficient heart that pumps more blood per beat (higher stroke volume). Elite endurance athletes often have resting HRs of 40–50 bpm. For the average adult, 55–65 bpm is healthy; above 80 bpm is a signal to improve aerobic fitness. Resting HR contributes directly to your Longevity Score here, and should be measured first thing in the morning after lying still for 5 minutes.

Is grip strength really linked to lifespan? +

Grip strength is a well-studied correlate of overall muscle mass, functional strength, and metabolic health. Multiple large prospective studies find it predicts all-cause and cardiovascular mortality independently of other risk factors. It is a correlate — not a direct cause — but it functions as a proxy for whole-body muscular fitness. Train it by adding progressive resistance exercise (compound lifts, farmer carries, pull-ups) to your routine.

Educational estimate — not a medical diagnosis. VO2 max here is modeled from a questionnaire, not measured in a laboratory. LongevIQ gives educational estimates only. Talk to a qualified clinician before starting a new exercise program, especially if you have heart conditions, symptoms of cardiovascular disease, or have been sedentary for an extended period. This tool is not a substitute for professional medical advice.

💪