Author: Alexander Gaber
FOOT TENSEGRITY IN BAREFOOT RUNNING
Foot tensegrity in barefoot running refers to the concept of maintaining the natural stability and flexibility of the foot during running without the support of traditional cushioned running shoes. Tensegrity, a term coined by Buckminster Fuller, combines “tensional integrity” and emphasizes how a structure maintains its shape and stability through the balance of tension and compression.
In the context of barefoot running, foot tensegrity focuses on the following principles:
- Natural arch support: The human foot has a natural arch formed by the arrangement of bones, ligaments, and tendons. In barefoot running, the arches of the foot play a crucial role in absorbing shock and providing stability. Tensegrity principles ensure that these arches are supported and engaged during each step, allowing them to distribute forces evenly and efficiently.
- Minimalist footwear: Some barefoot runners opt for minimalist footwear or even go completely barefoot to maintain foot tensegrity. Minimalist shoes provide minimal cushioning and support, encouraging the foot to move naturally and adapt to the ground, which helps in maintaining the foot’s natural arches and strength.
- Strengthening the intrinsic muscles: Barefoot running promotes the development of the intrinsic muscles of the foot. These muscles are responsible for maintaining the arches and providing stability. As the foot interacts directly with the ground during barefoot running, these muscles are engaged, leading to improved foot strength and function.
- Proprioception and feedback: Running barefoot allows for better proprioception, the body’s ability to sense its position and movements. By receiving more feedback from the ground, runners can make adjustments to their gait and posture, enhancing their overall running form and maintaining foot tensegrity.
- Proper gait mechanics: Barefoot running encourages a midfoot or forefoot strike pattern rather than a heel strike, which is commonly associated with traditional cushioned running shoes. This change in foot strike can reduce the impact forces on the foot and lower leg, contributing to foot health and maintaining tensegrity.
It’s important to note that transitioning to barefoot running should be gradual, as it requires the foot to adapt to the new demands. Proper form and technique are essential to avoid injuries. Individuals interested in barefoot running should consult with a knowledgeable coach or healthcare professional to ensure a safe and effective transition while preserving foot tensegrity.
KINEMATICS OF WALKING VS. RUNNING
Kinematics refers to the study of biomechanics of human movement. When comparing the kinematics of walking and running, we examine how the body moves in terms of various parameters like stride length, stride frequency, joint angles, and more. Here’s a comparison of the kinematics of walking and running:
- Stride Length:
- Walking: In walking, the stride length is relatively shorter compared to running. A stride is defined as the distance covered from one heel strike to the next heel strike of the same foot. In walking, individuals typically take shorter strides.
- Running: Running involves longer stride lengths. Runners cover more ground with each stride compared to walkers. This is achieved by pushing off more forcefully during the running gait.
- Stride Frequency:
- Walking: Walkers have a lower stride frequency, meaning they take fewer steps per minute. The slower pace of walking results in a lower stride frequency.
- Running: Runners have a higher stride frequency, taking more steps per minute. The need for rapid leg turnover contributes to a higher stride frequency during running.
- Joint Angles:
- Walking: During walking, joint angles at the hip, knee, and ankle change gradually and involve less extreme movements. The movements are generally more controlled and less dynamic.
- Running: Running involves greater joint angle changes, particularly at the hip and knee joints. There is a greater range of motion in these joints during running, as the legs are lifted higher during the swing phase and extended more forcefully during the push-off phase.
- Vertical Oscillation:
- Walking: Vertical oscillation, or the up-and-down movement of the body, is relatively low in walking. Walkers maintain a relatively constant height above the ground as they move.
- Running: Running exhibits more vertical oscillation, with the body moving up and down to a greater extent during each stride. This vertical displacement is a consequence of the bounding motion in running.
- Contact Time:
- Walking: During walking, each foot spends a longer time in contact with the ground compared to running. This extended contact time allows for a more stable and continuous support phase.
- Running: Running involves shorter contact times, as there are moments during each stride when both feet are off the ground. The contact time is shorter and more explosive during running.
- Arm Movement:
- Walking: Arm movement during walking is relatively relaxed and involves a natural pendulum-like swing of the arms to help maintain balance and rhythm.
- Running: Running requires more vigorous and coordinated arm movement. The arms counterbalance the leg movements and provide additional propulsion during the push-off phase.
In summary, the kinematics of walking and running differ in terms of stride length, stride frequency, joint angles, vertical oscillation, contact time, and arm movement. These differences reflect the distinct mechanics and energy requirements of each activity, with running involving more dynamic and forceful movements compared to the more controlled and steady movements of walking.
RACE REPORT – SANDSPUR 50k DEC 29 2023
This race was 90% running on sugar sand, which is soft sand. The course was located in Jupiter Ridge, and the design was 7 laps of ~7km each. As the race began at 7am, the temperature was unseasonably cold for South Florida, so clothing and planning for stripping was important. 
It was a gorgeous location, well run race, fun to experience sugar sand with some rolling dune hills, and very well organized.
Total Distance: 50k
Final time: 4 hours, 58 minutes, 33 seconds
Result: 1st Place Overall Male