250 ‒ Training principles for longevity | Andy Galpin, Ph.D. (PART II)

KEYPOINTS

• 01

  Muscle fiber makeup differs by muscle and by job.

  Galpin, an exercise physiologist, contrasts the calf's two main muscles: the gastrocnemius is often 60–80% fast type 2A fibers for sprinting and jumping, while the soleus underneath is built to be 'on all day' for standing and walking. Muscle also does non-movement work, such as pumping blood back toward the heart and acting as the body's largest glucose reservoir.

• 02

  Hypertrophy comes in more than one form.

  Bodybuilders long claimed higher-rep training produces 'sarcoplasmic' growth (more fluid and stored energy) while lower reps (around 5–10) add contractile units. Galpin calls this a vindication of 'bro science': Mike Roberts' lab at Auburn found sarcoplasmic hypertrophy really happens, alongside contractile hypertrophy. Just because science hasn't studied something yet doesn't mean it's wrong.

• 03

  Strength trumps size, but size still matters metabolically.

  Attia's reading is that strength predicts longevity more strongly than muscle size, though both correlate with lifespan, as does VO2 max. Size still matters because of muscle's metabolic role as a glucose sink that helps keep inflammation low. Galpin also rejects the myth that being very strong becomes harmful with age.

• 04

  Powerlifters train strength by accumulating reps in percentage zones.

  Programs prescribe accumulating set numbers of reps between 70–80%, 80–90% and 90%+ of a one-rep max. A one-rep max can be estimated with online calculators from a 3–10 rep set, and effort can be rated with RPE scales (the original Borg 6–20, or 1–10). Elite 'light' days are still enormous: a 1,000-lb squatter's 70% day is a 700-lb squat.

• 05

  Velocity tracking adds objective feedback.

  Attia uses a bar velocity transducer that measures each rep's speed in meters per second, projecting his one-rep max and showing fatigue as velocity drops across sets. Galpin agrees velocity is a useful lens on power training.

• 06

  Power is force times velocity, and the best load depends on the lift.

  A medicine-ball throw is fast but light; a snatch moves heavy load fast. Peak power appears around 30% of max for simple movements, 40–50% for squats, and 80–90% for highly technical lifts like the clean and jerk and snatch, which most people can't reach without technical skill. Cluster sets (single reps with 5–20 seconds rest) preserve quality.

• 07

  Post-activation potentiation draws on the size principle.

  Henneman's 1950s papers established that motor units, each made of a nerve and fibers of a single type, are recruited from small to large. A heavy prior effort can temporarily enhance subsequent power output; Galpin also describes the reverse, assisted jumps with body weight reduced 5–20% by a harness, to train speed.

• 08

  Strongman and CrossFit reward different blends.

  Strongman demands broad strength and stamina with odd objects, like flipping a 450-lb tire for 25 reps, but never 65-rep sets. Competitive male CrossFitters cluster around 5 ft 9 in to 5 ft 11 in and 190–210 lb because heavy lifting must coexist with gymnastics like 100 pull-ups, while top strongmen often weigh 330–400 lb.

• 09

  Heart rate recovery is a strong fitness metric.

  Good VO2 max testing centers check 1-, 2- and 3-minute recovery. Galpin's rough target: within two minutes, heart rate should be at least 20% below peak, so below 160 if you hit 200. A max test is only valid if you get near predicted max heart rate.

• 10

  Most training injuries are joint injuries from repetition of poor movement.

  Galpin says it's rare for the muscle itself to be the problem. Injuries come from global overreaching (frequent illness, disrupted cortisol, testosterone or estrogen, poor mood, sleep and appetite) or from joints repeatedly moving badly. Attia stresses that for older people avoiding interruptions matters most, because regaining lost fitness gets so costly.