Motor unit discharge rate in dynamic movements of the aging soleus
Kallio, J., Søgaard, K., Avela, J., Komi, P., Selänne, H., & Linnamo, V. (2014). Motor unit discharge rate in dynamic movements of the aging soleus. Frontiers in Human Neuroscience, 8(SEP), Article 773. https://doi.org/10.3389/fnhum.2014.00773
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Frontiers in Human NeuroscienceAuthors
Date
2014Copyright
© 2014 Kallio, Søgaard, Avela, Komi, Selänne and Linnamo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).
Aging is related to a variety of changes at the muscular level. It seems that the age-related
changes in motor unit activation are muscle- and intensity dependent. The purpose of this
study was to examine the motor unit discharge rate (MUDR) in both isometric and dynamic
contractions of the aging soleus muscle. Eight elderly males participated in the study.
The subjects performed isometric and dynamic plantar flexions while seated in an ankle
dynamometer. The force levels studied were 10, 20, 40, 60, 80 and 100% of the isometric
(ISO) maximal voluntary contractions (MVC) in ISO and 10, 20 and 40% in concentric (CON)
and eccentric (ECC) contractions. Soleus intramuscular EMG was recorded with bipolar
fine-wire electrodes and decomposed to individual trains of motor unit discharges. In ISO
the MUDR increased with each force level from 40 to 100% MVC. In dynamic contractions
the descriptive analysis showed a higher MUDR in CON compared to ISO or ECC. The
difficulties of recording single motor units in dynamic contractions, especially in the elderly
is discussed.
...
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Except where otherwise noted, this item's license is described as © 2014 Kallio, Søgaard, Avela, Komi, Selänne and Linnamo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).
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