Peter Attia MD217 ‒ Exercise, VO2 max, and longevity | Mike Joyner, M.D.
CHAPTERS
- 0:02 – 6:55
Mike Joyner's path from exercise physiology to anesthesiology
Peter Attia welcomes Mike Joyner and they discuss why Joyner trained as an anesthesiologist. He explains that anesthesia is the flip side of exercise physiology, and describes how he came to Mayo Clinic to work with John Shepherd on skeletal muscle blood flow.
- •Joyner volunteered as a subject in a lactate threshold study at age 19
- •He wanted to become a physician to do invasive human physiology studies
- •Anesthesia resembles an exercise test: monitoring breathing, blood pressure and heart rate while using autonomic drugs
- •Clinicians in anesthesia and critical care act as the patient's brainstem
- •He chose Mayo because of John Shepherd's work on muscle blood flow
- 6:55 – 14:33
Why exercise extends life: risk factors and natural experiments
Attia frames exercise as the most powerful of the longevity levers, and Joyner lists the mechanisms by which it helps. They then contrast the strong, consistent epidemiology of exercise (London bus conductors, Vasaloppet skiers) with the weak hazard ratios of nutrition studies.
- •Exercise affects blood pressure, diabetes, lipids, endothelial function and the autonomic nervous system
- •Joyner notes a synergy or 'X factor' beyond the sum of individual risk factors
- •Natural experiments like bus conductors versus drivers show about a 50% lower cardiovascular risk
- •Nutritional epidemiology suffers from small, inconsistent hazard ratios and confounding
- •Exercise is associated with roughly three to five extra years of life and more years of healthspan
- 14:33 – 22:39
Healthspan, the Centenarian Decathlon and the cliff of aging
Attia describes his Centenarian Decathlon model for the last decade of life. Joyner discusses the age-related drop in performance, the steep decline in the 70s toward frailty, and the value of strength, agility and jump rope training.
- •The Centenarian Decathlon has people opt out of specific physical tasks they don't want to lose
- •Performance declines from about 30 without training and can be pushed back to about 40 with training
- •Around the mid-70s decline steepens and shifts toward muscle strength and frailty
- •About 70% of 70-year-olds cannot get up off the floor, according to Joyner
- •Joyner recommends strength, circuit and agility work in the 40s and 50s, and jumps rope himself
- 22:39 – 28:09
Inactivity, bed rest, hip fractures and the exercise-versus-diet question
They discuss the 'death spiral' of lost strength and lost activity, a three-week bed rest study, and the high one-year mortality after hip fracture. Joyner then brings in long-lived populations and data suggesting fitness can blunt diet's effects, leading into whether you can outrun a bad diet.
- •Three weeks of bed rest produced losses similar to 30 years of aging in young men
- •About half of 65+ patients with a hip or femur fracture die within a year
- •Lester Breslow's Oakland study found the very old shared a handful of lifestyle habits
- •Among the fittest people in the Cooper Clinic data, diet had little effect on mortality
- •Very active groups like lumberjacks, the Amish and Tour de France riders eat huge amounts without gaining weight
- 28:09 – 35:31
The autonomic nervous system and heart rate recovery
Joyner explains the autonomic nervous system and its sympathetic and parasympathetic branches, and why exercise raises blood pressure and heart rate in the moment yet improves function afterward. They cover heart rate recovery and heart rate variability as indirect markers of vagal tone.
- •The autonomic system regulates the internal environment, while exercise keeps it tuned
- •Blood pressure and cardiac output rise during exercise to meet muscle demand
- •Faster heart rate recovery reflects better vagal function
- •Vagal tone is protective against arrhythmias
- •Heart rate variability varies at baseline but is modifiable with training
- 35:31 – 44:05
VO2 max testing and its link to all-cause mortality
Joyner describes how a VO2 max test is done and how METs relate to fitness. Attia highlights the JAMA study in which risk falls steadily with higher fitness, with no plateau, and the two discuss why unfitness is such a strong risk factor.
- •VO2 max is measured with a mask or mouthpiece on a bike or treadmill
- •Mortality keeps falling with fitness even up to 15–16 METs
- •Attia cites a fivefold hazard ratio between the top 2.5% and the bottom 25% of fitness
- •Low fitness carries risk comparable to or exceeding end-stage renal disease and smoking
- •Exercise is not a vaccine, but athletes like Clarence DeMar had larger, healthier coronary arteries
- 44:05 – 53:14
Is there a J-curve for exercise? Atrial fibrillation and heart risks
Attia raises the literature suggesting too much exercise raises mortality and explains MET-hours per week. Joyner argues the evidence for a J-curve is weak, noting small numbers at the extreme and the Vasaloppet data, and addresses atrial fibrillation and fibrosis concerns.
- •MET-hours per week are used to compare training volume across studies
- •Joyner says not all studies show a J-curve and extreme groups are tiny
- •The Vasaloppet skier data is, in his view, the most dispositive
- •Heavy training may raise atrial fibrillation risk but not fatal arrhythmias
- •Evidence points to compliant, flexible ventricles rather than harmful fibrosis
- 53:14 – 1:01:51
Age-related VO2 max decline and the fitness goal for your 80s
Attia asks how much VO2 max declines with age, and Joyner says about 10% per decade, roughly half that in those who keep training hard. They reason about the VO2 max needed to stay independent and active in one's 80s, landing near 30.
- •VO2 max falls about 10% per decade from the 30s without training
- •Dave Costill's follow-up of elite athletes found only about a third kept training hard and kept their fitness
- •A higher baseline means trained people stay far ahead even if they decline
- •Roughly 14 mL/kg/min is needed for basic daily living and 35 corresponds to a ten-minute mile
- •Both men converge on about 30 as a goal for the 80s, alongside strength and agility
- 1:01:51 – 1:08:43
What drives VO2 max: cardiac output and peak heart rate
They break down the steps from air to tissue, and Joyner argues that delivery of blood, meaning heart rate times stroke volume, is the main limiter. Examples such as rower Eskild Ebbesen and personal anecdotes illustrate how peak heart rate varies and falls with age.
- •Oxygen uptake equals cardiac output times arteriovenous oxygen difference
- •Joyner says you cannot extract oxygen that hasn't been delivered
- •Eskild Ebbesen kept his VO2 max while his peak heart rate dropped from about 190 to 150
- •The age-related fall in VO2 max comes mostly from reduced peak heart rate
- •Attia and Joyner share their own peak heart rate experiences, and Lance Armstrong's sustained 200 bpm
- 1:08:43 – 1:21:55
How elite endurance athletes train and why careers are longer
The conversation turns to aerobic efficiency and the training of athletes like Pogačar and Kipchoge, whose training is roughly 60–70% easy, 20% moderate and 10% hard. Joyner also explains that elite training has changed little in decades, while sports medicine and money have extended careers.
- •Elite athletes sustain a very high fraction of VO2 max at low lactate
- •Kipchoge likely runs 14–20 hours a week with a polarized intensity split
- •The 60/20/10 distribution has converged across decades of training approaches
- •Longer careers stem from better sports medicine and greater financial incentives
- •Light activity such as walking, gardening and parking farther away brings the largest health gains in the first 10–15 minutes
- 1:21:55 – 1:31:24
Tracking metrics and Joyner's own training routine
Attia asks whether heart rate recovery should be tracked, and Joyner favors big-picture measures and perceived exertion. He then details his hard/easy training week, his strength circuit, bike ladders and active-rest days, and his estimates of his current fitness.
- •Joyner calls himself a 'tech nudie' and relies on rating of perceived exertion
- •He urges accountability through a partner, device or diary instead of fixating on metrics
- •His hard days pair a 22-minute drop-set circuit with eight bike ladders peaking near 350 watts
- •Easy days are 30–40 minutes of active rest by feel
- •He averaged 316 watts for an hour and estimates his VO2 max at about 4.5 L/min
- 1:31:24 – 1:45:45
Boosting VO2 max: 4x4 intervals, form and tempo
Attia describes the 4x4 protocol he gives patients and Joyner agrees, offering tips such as the 'no bend over' rule and managing suffering. They discuss maintaining form and tempo under fatigue, with Michael Phelps and other athletes as examples, and how to start beginners.
- •Four four-minute hard intervals with four minutes of recovery is an efficient VO2 max protocol
- •Pace the intervals so you aren't bent over at the end, which Joyner calls the 'no bend over rule'
- •Good interval training means managing suffering while holding form and tempo
- •Phelps and others show effort combined with relaxation
- •Beginners should build a base before hard intervals, and once a week of intervals can raise VO2 max
- 1:45:45 – 1:54:24
Performance-enhancing drugs in sport
Attia asks where doping stands today. Joyner says testing has improved and industrial-scale doping is largely over, but microdosing, novel compounds and do-it-yourself chemistry leave room for cheating, and he discusses BALCO figures and the arms-race culture.
- •Testing thresholds are set high to avoid false positives, leaving room for microdosing
- •Joyner believes industrial-strength doping like the East German program is largely over
- •Novel peptides and short-lived compounds may be hard to detect
- •Many scandals were uncovered through investigations rather than tests
- •Competitive culture creates an arms-race mentality
- 1:54:24 – 1:57:58
Can exercise be put in a pill? Mimetics and the polypill
Attia asks about capturing exercise's benefits in a drug. Joyner is unenthusiastic about exercise mimetics, which mostly target mitochondria and can't replicate effects on the autonomic system, blood vessels or heart, and he suggests a polypill as a more realistic alternative.
- •Mimetics so far focus on mitochondrial biosynthesis and work in animal models
- •Better mitochondria won't improve autonomic function, blood pressure or vessel lining
- •Joyner calls current mimetics 'one-trick ponies'
- •A polypill of low-dose statin, blood pressure drug and others could reduce risk factors
- •He says polypills are understudied and unpatentable, but still encourages exercise
- 1:57:58 – 2:07:58
Joyner's current research: left-shifted hemoglobin and convalescent plasma
Joyner describes his interest in people with left-shifted hemoglobin and hypoxia. He then explains how he came to lead the US Convalescent Plasma Program, what it found, and how high-titer plasma from hybrid-immunity donors helps immune-suppressed patients.
- •Animals adapted to altitude have left-shifted oxygen-hemoglobin curves, and some people carry rare left-shifted hemoglobins
- •The US Convalescent Plasma Program treated over 100,000 patients
- •Early high-antibody plasma appeared to help, and it was particularly useful in immune-suppressed patients
- •Donors with both infection and vaccination are 'super donors'
- •A single dose of 200–400 mL of high-titer plasma is typical
- 2:07:58 – 2:12:18
The future of physical activity in America and closing thoughts
Attia asks whether Joyner is optimistic about Americans' physical activity. Joyner says society needs to do something, citing the loss of unstructured play and open gyms, and proposes a national open gym movement, and they close with a workplace walking example and goodbyes.
- •Privileged kids get excellent coaching while access for others has eroded
- •Joyner points to a decline in unstructured play and community open gyms
- •He would start a national open gym movement
- •Attia floats a mandatory daily hour of activity
- •Hospital secretaries walking at lunch show social and productivity benefits
