Is running a more efficient way to travel than walking?

Original Article ↗ Hacker News Discussion ↗

Methodology and 7‑minute‑mile claim

  • Many doubt that 7:00 min/mile (4:20 min/km) is the “most efficient” human running speed in any general sense.
  • Objections: most adults cannot run that pace at all or only briefly; it corresponds to strong club‑level performance (near ~3:00 marathon).
  • Several note likely sampling bias: data probably dominated by relatively light, trained runners, not the general population.
  • Commenters say walking has a clear U‑shaped efficiency curve, but human running cost vs speed is relatively flat; “one optimal pace” may be overstated.

Running vs walking efficiency

  • Distinction emphasized between:
    • Energy per distance (kcal/km) vs
    • Energy per time (kcal/hour, METs).
  • Some personal analyses: calories ≈ proportional to distance × body weight; walking may use ~80% of the calories per distance compared to running.
  • Faster speeds raise power output; many people hit cardiovascular limits long before any theoretical efficiency optimum.
  • Efficiency is multidimensional: fatigue, joints, mental load, time in sun/cold, and time on feet all matter. For long days, a light run/jog can feel less tiring than long slow walking because you finish sooner.

Human endurance and persistence hunting

  • Multiple references to research on human evolution: humans have unusually flat running‑efficiency curves, good cooling (sweat glands, “nakedness”), and excel at endurance over many speeds.
  • Discussion of persistence hunting: humans jogging animals into heat exhaustion; contrasted with quadrupeds whose optimal gaits have narrower speed ranges.
  • Anecdotes and analogies extend this to human‑vs‑human “endurance advantage,” but others point out tactical and technological factors make this unrealistic in modern conflict.

Training, fitness, and heart‑rate zones

  • Many anecdotes: people who can walk 20–40 km but are destroyed by a short run; others who can run long at modest pace but can’t approach 7‑min miles.
  • Age, body mass, and prior activity strongly affect feasible pace; some older runners doing high mileage still cannot hit 7‑min miles.
  • Zone‑2 / MAF (low‑intensity, fat‑dominant) training is repeatedly mentioned as key to building distance capacity, even if it feels “too slow” and often includes walking at first.

Injury risk and biomechanics

  • One side claims repetitive impact from running wears out knees (cartilage, meniscus) and should count as a deferred “efficiency cost.”
  • Others cite a study (linked) finding no clear association between years of running, pace, or marathon counts and arthritis.
  • Technique is highlighted: forefoot or mid‑foot strike, “natural running,” and stronger legs (e.g., squats) are said to reduce knee pain; downhill running is widely reported as hard on joints.

Weight loss, practicality, and psychology

  • Multiple stories of substantial weight loss from long daily walks; walking is easy to sustain, integrate into commuting/errands, and doesn’t spike appetite as much as hard runs.
  • Cycling is seen as mechanically efficient but less helpful for bone density and (for some) weight control vs walking.
  • Rucking (walking with a heavy backpack) is noted as dramatically raising calorie burn.
  • Several emphasize the mental benefits of running (focus, mood) even if it’s not calorically “better” than walking.

Units, metrics, and technical nitpicks

  • Complaints about imperial units for speed and kcal instead of joules; some convert METs to W/kg and note 1 MET ≈ 1.16 W/kg.
  • Clarifications about “calorie” vs “kilocalorie” and about correct dimensional notation (kcal/kg/h vs kcal/(kg·h)).
  • Some argue the headline violates Betteridge’s law; others note the article conflates “energy per time” with “energy per distance,” confusing the central question.