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Research article summary:
Characteristics of surface mechanomyogram are dependent on development of fusion of motor units in humans.
Abstract Extract:
The purpose of this study was to test whether surface mechanomyogram (MMG) recorded on the skin reflects the contractile properties of individual motor units in humans. Eight motor units in the medial gastrocnemius muscle were identified, and trains of ... (Full abstract text below) Published 2002Nov
in Journal: J Appl Physiol
(Language : eng)
Full Pubmed Extract
This information was retrieved, real-time, on your behalf from the public area of the Pubmed website:
1. J Appl Physiol.
2002 Nov;93(5):1744-52
Characteristics of surface mechanomyogram are dependent on development of fusion of motor units in humans.
Yoshitake Y, Shinohara M, Ue H, Moritani T
Laboratory of Applied Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. yoshitake@oita-nhs.ac.jp
The purpose of this study was to test whether surface mechanomyogram (MMG) recorded on the skin reflects the contractile properties of individual motor units in humans. Eight motor units in the medial gastrocnemius muscle were identified, and trains of stimulation at 5, 10, 15, and 20 Hz were delivered to each isolated motor unit. There was a significant positive correlation between the duration of MMG and twitch duration. MMG amplitude decreased with increasing stimulation frequency. Reductions in MMG amplitude were in parallel with the reductions in force fluctuations, and the rate of change in both was positively correlated across the motor units. Rate of change in MMG amplitude against force was negatively correlated to half relaxation time and twitch duration. Similar negative correlations were found between force fluctuations and contractile properties. These results provide evidence supporting a direct relation between MMG and contractile properties of individual motor units within the gastrocnemius muscle, indicating that surface MMG is dependent on the contractile properties of the activated motor units in humans.
PMID : 12381762 [PubMed - Indexed for MEDLINE]
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Full Author Information
| First Name | LastName | Initials |
| Yasuhide | Yoshitake | Y |
| Minoru | Shinohara | M |
| Hidetoshi | Ue | H |
| Toshio | Moritani | T |
Affiliation: Laboratory of Applied Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. yoshitake@oita-nhs.ac.jp
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Category links from this article:- Adult
- Electric Stimulation
- Electromyography
- Humans
- Male
- Muscle Contraction - physiology
- Muscle Fibers - physiology
- Muscle Relaxation - physiology
- Muscle, Skeletal - physiology
- Pressure
- Reaction Time
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