Stepping onto the unknown: reflexes of the foot and ankle while stepping with perturbed perceptions of terrain
| Autor: | Luke A. Kelly, Arthur D. Kuo, Dominic James Farris, Ryan C. Riddick, Andrew G. Cresswell |
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| Rok vydání: | 2021 |
| Předmět: |
030110 physiology
0301 basic medicine Reflex Stretch medicine.medical_specialty Biomedical Engineering Biophysics Bioengineering Sensory system Kinematics Biochemistry Biomaterials 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation medicine Humans Stretch reflex Muscle Skeletal Life Sciences–Engineering interface Foot (prosody) Soleus muscle Electromyography Motor control body regions medicine.anatomical_structure Reflex Perception Ankle Psychology 030217 neurology & neurosurgery Biotechnology |
| Zdroj: | J R Soc Interface |
| ISSN: | 1742-5662 |
| Popis: | Unanticipated variations in terrain can destabilize the body. The foot is the primary interface with the ground and we know that cutaneous reflexes provide important sensory feedback. However, little is known about the contribution of stretch reflexes from the muscles within the foot to upright stability. We used intramuscular electromyography measurements of the foot muscles flexor digitorum brevis (FDB) and abductor hallucis (AH) to show for the first time how their short-latency stretch reflex response (SLR) may play an important role in responding to stepping perturbations. The SLR of FDB and AH was highest for downwards steps and lowest for upwards steps, with the response amplitude for level and compliant steps in between. When the type of terrain was unknown or unexpected to the participant, the SLR of AH and the ankle muscle soleus tended to decrease. We found significant relationships between the contact kinematics and forces of the leg and the SLR, but a person's expectation still had significant effects even after accounting for these relationships. Motor control models of short-latency body stabilization should not only include local muscle dynamics, but also predictions of terrain based on higher level information such as from vision or memory. |
| Databáze: | OpenAIRE |
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