The Role of Cutaneous Sensory Feedback During Running

DeSouchet, Nicole and Chavarria, Manuel and Dasugo, Dusty and Thompson, Melissa (2015) The Role of Cutaneous Sensory Feedback During Running. [Abstract]

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INTRODUCTION Gait and locomotion patterns are shaped by sensory feedback and input from the outside environment. Many different sensory systems including visual, vestibular and somatosensory, contribute to the overall control of gait [1]. The plantar surface of the foot is the only part of the body to constantly be in contact with the ground during bipedal locomotion, as a result sensory information from cutaneous receptors to thought to influence human gait patterns [1,2]. The lack of information from cutaneous receptors has been shown to affect kinematic variables during human walking [3]. However, the role of cutaneous feedback during running is not well understood. The aim of our research was to specifically minimize cutaneous feedback by anesthetizing the soles of the feet in order to further understand the role of cutaneous sensory feedback during running. We hypothesized that with loss of cutaneous feedback from the plantar surface of the foot individuals would run with similar mechanics in the barefoot and shod conditions. METHODS Nine healthy active subjects (6 male, 3 female); mass: 62.6+12.2 kg; age: 25+1.71 years participated in this study. 10 trials were completed in each of the following conditions: barefoot run (BF), shod run (SHOD), barefoot run with anesthesia (BF ANEST), shod run with anesthesia (SHOD ANEST). For the aestheticized conditions intra-dermal injections consisting of a total of 6mL 1% lidocaine per foot were administered to the plantar metatarsal heads, plantar lateral column and plantar heel following standard alcohol skin prep. 3D joint angles, stride length and velocity were measured via a 6-camera Vicon motion analysis system. Ground reaction forces were measured in synchrony with motion capture data. Repeated measures ANOVA tests were performed to analyze kinematic and kinetic changes associated with the four conditions. RESULTS The results show statistically significant differences between the BF and SHOD conditions in terms of velocity, ankle angle at ground contact, peak vGRF and peak apGRF. Significant differences were also found between the BF ANEST and SHOD ANEST conditions in terms of peak vGRF. For a respective shoe condition (BF or SHOD) there were no significant differences between the aestheticized and non-aestheticized conditions. DISCUSSION AND CONCLUSIONS These results support previous findings of reduced GRFs and adopting a plantarflexed position at ground contact when running barefoot. The lack of significant changes in the aestheticized conditions suggests that plantar cutaneous sensory feedback does not play a major role in influencing running mechanics. It is possible that, given the high forces involved in running, other sources of feedback including information from muscle and joint receptors provide dominant sources of sensory information when running. REFERENCES [1] Eils, et al. Gait Posture, 20, 54-60, 2003. [2] Hohne, A., Stark, C., & Bruggemann, G. Clin Biomech, 24, 308-313, 2009. [3] Nurse, M, et al., J Electromyogr Kinesiol, 15, 496-506, 2003. ACKNOWLEDGEMENTS This research was funded by the Fort Lewis College’s undergraduate research grant program

Item Type: Abstract
Created by Student or Faculty: Student
Subjects: Undergrad Research Symposium > Exercise Science
Undergrad Research Symposium
Depositing User: Nicole DeSouchet
Date Deposited: 14 Apr 2015 10:22
Last Modified: 14 Apr 2015 10:22

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