Motor unit firing behaviour of soleus muscle in isometric and dynamic contractions

Understanding the detailed control of human locomotion and balance can be improved, when individual motor units can be isolated and their firing rates followed in natural movement of large, fuctionally important muscles. For this reason the present study investigated the motor unit discharge rate (M...

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Bibliographic Details
Published in:PloS one 2013-02, Vol.8 (2), p.e53425-e53425
Main Authors: Kallio, Jouni, Søgaard, Karen, Avela, Janne, Komi, Paavo V, Selänne, Harri, Linnamo, Vesa
Format: Article
Language:English
Subjects:
Adult
Biology
Biomechanics
Discharge
Electromyography
Humans
Isometric Contraction - physiology
Kinesiology
Locomotion
Male
Males
Mechanical properties
Medicine
Motor Neurons - physiology
Motor units
Muscle contraction
Muscle Contraction - physiology
Muscle, Skeletal - physiology
Muscles
Physics
Physiology
Soleus muscle
Studies
Torque
Velocity
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Summary:Understanding the detailed control of human locomotion and balance can be improved, when individual motor units can be isolated and their firing rates followed in natural movement of large, fuctionally important muscles. For this reason the present study investigated the motor unit discharge rate (MUDR) in isometric and dynamic contractions of the soleus muscle. Eleven males performed isometric (10-100% MVC) and dynamic (10-40% MVC) plantar flexions. Intramuscular EMG was measured from Soleus with bipolar wire-electrodes and decomposed with custom built "Daisy" software. The Soleus MUDR was significantly higher in concentric compared to isometric or eccentric contractions at all submaximal force levels (P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0053425