The Effects of a Carbon Fiber Shoe Insert on Athletic Performance

NewsBot · Apr 19, 2017

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Technical Report:
The Effects of a Carbon Fiber Shoe Insert
on Athletic Performance in Collegiate Athletes
Robert W. Gregory, Ph.D., Robert S. Axtell, Ph.D.,
Marc I. Robertson, D.P.T., and William R. Lunn, Ph.D.
Human Performance Laboratory, Exercise Science Department
Submitted: February 13, 2017

Summary
The use of a carbon fiber shoe insert can improve performance in the 40-yard sprint and vertical
jump. In the vertical jump, jump height increased by 2.6 cm (4.1%) in a group of 28 participants.
These results are similar to those found by Stefanyshyn & Nigg (2000) when using carbon fiber
plates inserted into shoe midsoles. In addition, all of the biomechanical variables measured
during the vertical jump (maximal force, impulse, rate of force development, total work, average
power, and maximal power) increased between 2.0-7.6% when using a CF shoe insert compared
to a standard shoe insert. However, it should be noted that these increases were observed in the
optimal CF shoe insert condition for each individual. When analyzing the performance of the 40-
yard sprint, the 0-10 yard and 20-40 yard split times both improved by 1.6% and 1.3%,
respectively. These performance improvements are similar to the 1.2% improvement in 20-40
yard split times observed by Stefanyshyn & Fusco (2004) in a group of 34 male and female
sprinters. In addition, all of the biomechanical variables measured during the 40-yard sprint
(maximal force, rate of force development, and maximal power) increased between 1.6-9.3%
when using a CF shoe insert compared to a standard shoe insert.
It is imperative that an athlete choose the correct CF shoe insert flex to benefit from these
improvements in performance. An athlete cannot use a carbon fiber shoe insert of random
stiffness and expect to experience performance improvement; instead, the athlete must choose
the correct flex that matches his/her body weight and movement biomechanics. Similar to the
conclusions of Stefanyshyn & Fusco (2004), it is speculated that individual differences in
technique as well as the length-tension and force-velocity relationships of the calf musculature
may influence the appropriate CF shoe insert stiffness for each athlete to obtain their maximal
performance.
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Full report (pdf)

NewsBot · Apr 19, 2017

This the insoles they used here: https://www.vktrygear.com/

terigreen · Nov 2, 2020

NewsBot said: ↑

Technical Report:
The Effects of a Carbon Fiber Shoe Insert
on Athletic Performance in Collegiate Athletes
Robert W. Gregory, Ph.D., Robert S. Axtell, Ph.D.,
Marc I. Robertson, D.P.T., and William R. Lunn, Ph.D.
Human Performance Laboratory, Exercise Science Department
Submitted: February 13, 2017

Full report (pdf)
Click to expand...

Loved reading the report. We manufacturer carbon fiber semi-rigid insoles. Many of our customers are runner and sports medicine physicians who highly recommend using a carbon fiber shoe insert.
Teri
Atlas Biomechanics

NewsBot · Jul 18, 2023

Carbon Fiber Insoles Enhance Perception of Performance Despite Variable
Objective Outcomes: Specific to the Moderately Active Individual
ERIN E. DIERICKX et al
International Journal of Exercise Science 16(4): 885-897, 2023.

Carbon fiber insoles (CFIs) may benefit
performance in elite athletes, however, their use in moderately active individuals has been adopted without
evidence supporting such enhancements in this population. Fifteen male subjects performed vertical jump (VJ) and
repeat treadmill sprint tests before and after a VO2peak while wearing 1) CFIs and 2) control insoles (CON). Subjects
completed a subjective survey regarding their perceived performance abilities for both conditions. There were no
significant differences between CFIs and CON in VJ height, sprint distance, heart rate following sprints; and rate
of oxygen consumption, perceived fatigue, and perceived exertion at 85% of maximal speed (p > 0.05) during the
VO2peak. At maximal speed, although there was no difference between conditions in peak rate of oxygen
consumption (95%CI [-4.85, 0.21]) and respiratory exchange ratio (95%CI [-0.01, 0.03]), CFIs resulted in a reduced
level of perceived fatigue (95%CI [-1, 0]) and perceived exertion (95%CI [-2, 0]) compared to CON. Subjects
subjectively reported increased feelings of “propulsion or explosiveness” (p = 0.026) and being able to “perform better
while jumping” (p = 0.029) while wearing CFIs. Heightened perceptions of performance enhancements when
wearing CFIs indicate, in the moderately active, perceptual benefits could be more influential for determining CFI
use.
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