The study that changed the market
In 2017, Wouter Hoogkamer and colleagues at the University of Colorado published the study that gave the Nike Vaporfly its scientific basis. The shoe reduced the oxygen cost (running economy) by an average of 4% compared with the best competitor of the time. In 2018, the same group published data showing that for elite runners this can translate into 2 to 3 minutes less in a marathon.
The mechanism is twofold: the carbon fiber plate acts as a rigid lever that stores and returns elastic energy at push-off; the Vaporfly ZoomX PEBA foam has an energy return above 80%, compared with 65 to 70% for conventional EVA foams.
Hoogkamer W et al., Sports Medicine, 2018, "A Comparison of the Energetic Cost of Running in Marathon Racing Shoes"
Is the carbon plate for everyone?
Not exactly. Biomechanics data show that the plate's benefit is greater in runners whose cadence and technique make good use of the elastic return. Runners with a very short stride or a strong heel strike dominance may not get the same gain as midfoot or forefoot runners.
In addition, carbon plate shoes are not for daily training. The high drop and the very high stack change running mechanics. Daily use can mask muscle weaknesses (calf, peroneal) and increase the risk of injury from prolonged use. The general recommendation from biomechanists is to use the super shoe for specific quality workouts and races.
Types of shoes by goal
Super shoes (carbon plate): Nike Vaporfly, Adidas Adizero Pro, Saucony Endorphin Pro, ASICS Metaspeed Sky. For races and interval workouts. Durability 300 to 500 km.
Daily training (neutral): Nike Pegasus, Asics Kayano/Cumulus, Brooks Ghost, New Balance 1080. Balanced cushioning, durability 700 to 1000 km. For most of the week's kilometers.
Trail running: lugged outsole for grip on dirt and trail. Salomon Speedcross, HOKA Speedgoat. Not suitable for asphalt (fast wear and inferior performance).
Minimalist: Inov-8, Altra, Vivobarefoot. For those who want to work foot and ankle strength. The transition should be gradual (months, not weeks) to avoid Achilles tendinopathy and plantar fasciitis.
Nigg BM et al., Footwear Science, 2015, "The preferred movement path paradigm: influence of running shoes on joint movement"
The scientific basis of this category comes from the study by Hoogkamer and colleagues (2018), published in Sports Medicine. In the laboratory, 18 high-level runners tested three models at paces of 14, 16 and 18 km/h. The prototype with light foam and an embedded carbon plate reduced the energetic cost of running by about 4% on average, with individual gains ranging from 2% to 6%. The detail that drew the most attention: all 18 participants improved their running economy, without exception, at all three speeds. It is worth remembering that saving energy does not replace training, it just returns part of the cost with every stride.
The performance leap was so evident that World Athletics stepped in. In January 2020, the body set the 40 mm sole thickness limit for road races and allowed at most one rigid plate per shoe (it may come in parts, as long as they are on the same plane, without overlap). The rule sought to contain the technological escalation without banning the category, which had already consolidated on the podiums. Shoes outside these measurements become ineligible for records and elite competitions.
The role of the plate is often overstated in marketing. Mechanics studies indicate that the energy return from foam compression can be much greater than that from bending the plate alone. PEBA foam (Pebax) returns somewhere around 80% of the energy, against 60% to 65% for the conventional EVA used for decades. The plate matters because it stiffens the assembly and stabilizes this reactive foam, but the fuel of the gain lies above all in the midsole material, not in the carbon alone.
