The center of pressure and ankle muscle co-contraction in response to anterior-posterior perturbations

Though both contraction of agonist muscles and co-contraction of antagonistic muscle pairs across the ankle joint are essential to postural stability, they are perceived to operate independently of each other, In an antagonistic setup, agonist muscles contract generating moment about the joint, whil...

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Bibliographic Details
Published in:PloS one 2018-11, Vol.13 (11), p.e0207667-e0207667
Main Authors: Kim, Dongwon, Hwang, Jong-Moon
Format: Article
Language:English
Subjects:
Adaptation
Adult
Analysis
Ankle
Ankle Joint - physiology
Biology and Life Sciences
Biomechanics
Brain research
Center of pressure
Ecology and Environmental Sciences
Electromyography
Health aspects
Humans
Male
Medicine
Medicine and Health Sciences
Movement (Physiology)
Muscle Contraction
Muscle, Skeletal - physiology
Muscles
Musculoskeletal system
Neurophysiology
Older people
Perturbation
Physical Sciences
Physiological aspects
Physiology
Posture
Pressure
Rehabilitation
Research and Analysis Methods
Stability
Stiffness
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Summary:Though both contraction of agonist muscles and co-contraction of antagonistic muscle pairs across the ankle joint are essential to postural stability, they are perceived to operate independently of each other, In an antagonistic setup, agonist muscles contract generating moment about the joint, while antagonist muscles contract generating stiffness across the joint. While both work together in maintaining robustness in the face of external perturbations, contractions of agonist muscles and co-contractions of antagonistic muscle pairs across the ankle joint play different roles in responding to and adapting to external perturbations. To determine their respective roles, we exposed participants to repeated perturbations in both large and small magnitudes. The center of pressure (COP) and a co-contraction index (CCI) were used to quantify the activation of agonist muscles and antagonistic muscle pairs across the ankle joint. Our results found that participants generated moment of a large magnitude across the ankle joint-a large deviation in the COP curve-in response to perturbations of a large magnitude (p
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0207667