The shoe’s main advantage is reducing energy dissipation, not creating energy.
1. The Run Smarter Podcast episode focuses on latest research on super shoes and advanced footwear technology.
2. Brodie is the host, an online physiotherapist for runners, and he frames the episode around recent peer-reviewed running research.
3. The episode asks whether carbon-plated shoes and high-tech foam help only elites or also recreational runners.
4. Brodie opens with a review titled "Mechanisms, Economy, and Performance of Advanced Footwear Technology in Endurance Runners," which he says is 28 pages long.
5. He describes super shoes as a layered "sandwich" of carbon plates, foam, stack height, toe spring, and bending stiffness.
6. The review says curved carbon plates are generally associated with greater improvements in running economy than flat plates.
7. Brodie explains that rocker geometry and longitudinal bending stiffness create a rollover effect that can shorten ground contact time.
8. The paper says stack height acts like a compliant spring, and Borman et al found that adding 10 millimeters beyond the current 40 millimeter limit improved running economy by 0.6% on a treadmill and 0.7% overground.
9. He notes that the 50 millimeter shoe was rated lowest for subjective comfort even though it improved running economy.
10. The foam section compares EVA, PEBA, and TPU, and Brodie says PEBA is considered one of the most efficient materials for energy return.
11. He adds that PEBA’s low density leads to faster wear, and Rodrigo Carranza et al found that new PEBA shoes lost their advantage after 450 kilometers.
12. Brodie says super shoes reduce energy dissipation at the big toe joint, rather than truly creating energy for propulsion.
13. The paper also links super shoes to altered biomechanics, including reduced knee flexion and possible increases in lower-limb loading.
14. Brodie cites stress reactions and navicular stress fractures as reported concerns when runners transition abruptly into carbon-plated shoes.
15. He says gradual integration is needed so the musculoskeletal system can adapt to the altered loading.
16. The meta-analysis pooled 14 crossover studies and found small to moderate metabolic savings for full-length carbon plates, with mean running-economy benefits of about 2.9%.
17. Brodie says the plate effect is difficult to isolate because foam, rocker geometry, stack height, and shoe mass all interact with it.
18. The slower-speed randomized crossover study tested an On Cloud Runner 2, an On Cloudboom Echo 3, and an On prototype, and it found a 2.3% to 3.1% oxygen-cost reduction from 7.5 to 12 kilometers per hour.
19. Listeners who follow running-shoe research, marathon training, or injury prevention would likely find this episode useful.
20. Listeners wanting personal stories or a general fitness chat would probably skip it.
