239 ‒ The science of strength, muscle, and training for longevity | Andy Galpin, Ph.D. (PART I)

KEYPOINTS

• 01

  Strength, power and endurance are distinct qualities.

  Galpin, a professor of human bioenergetics at Cal State Fullerton since 2011, separates force production (strength), force times velocity (power) and repeated output (endurance). The distinction shows in sport: a World's Strongest Man event may be won in 5–15 reps, while CrossFit can demand 90. Training for longevity means deliberately building each, not just one.

• 02

  Adding muscle won't transform your metabolic rate.

  People imagine five pounds of new muscle will lift basal metabolic rate from 1,500 to 2,500 calories a day; Galpin says that's far outside reality. There are many reasons to build muscle, but large calorie burn at rest isn't one.

• 03

  Fiber types sit on a spectrum, and hybrids are common.

  Humans have type 1 (slow), 2A and 2X fibers; the old '2B' label was a misidentification in humans, though animals like bears and cheetahs (20–60% 2B) have them. A type 2A fiber generates roughly 5–6 times the power of a type 1. Hybrids (1/2A, 2A/2X, even triple) are common, while pure 2X fibers are extremely rare, around 0.1% of the hundreds of thousands Galpin's lab has analyzed.

• 04

  Muscles' composition matches their job.

  The soleus can approach 100% slow twitch because we're ambulatory so much, while the vastus lateralis is typically about 50-50 fast and slow. Some elite athletes in Galpin's lab exceed 80–85% fast twitch. Unusual 2X levels appear in people with long-term spinal cord injury (up to 50–60%), and sometimes in older adults, for unclear reasons.

• 05

  Training shifts fibers, especially away from hybrids.

  With any physical training, hybrid fibers tend to decline and fibers settle into pure 2A or type 1, the forms Galpin says you want to 'train into'. A strength-trained person might be about 70% 2A and 30% type 1, while long-term endurance training can drive the composition toward nearly all slow twitch.

• 06

  Slow fibers get trained by daily life; fast fibers need specific work.

  Hypertrophy is fairly non-specific as a training outcome, but targeting fast fibers requires heavy or explosive work, because slow fibers are activated by any activity of daily living or cardio zone. This matters for aging, since fast-fiber function is what declines and what prevents falls.

• 07

  Falls after 60 are often about foot speed and eccentric strength.

  When you catch a toe or slip, you need the foot speed to get a foot back underneath you and the eccentric strength to stop the fall, so you don't break a hip. That's why Galpin opens Attia's hypothetical program with 10–15 minutes of power and speed work, like jumps and playful drills.

• 08

  Aim for high lean mass, but make it functional.

  Attia's DEXA showed his appendicular lean mass index around the 40th percentile; he thinks at or above the 75th percentile is a better place, but wants strength and capability, not just size.

• 09

  Program design: 60/20/20.

  For a client with three 60-minute sessions a week, Galpin splits the effort into about 60% what you need now, 20% long-term development and 20% fun. Sessions vary rep ranges, for example a Wednesday of 15–20-rep sets that drives less soreness, plus isometrics like holding a thigh-parallel squat for two minutes.

• 10

  Weight cuts are mostly water and need careful rehydration.

  Roughly two-thirds to 70% of body weight is water. Fighters can cut 8–15 lb of water in a day, ideally with most of the drop done passively earlier in fight week, then rehydrate with about 110–125% of the fluid lost.