Effect of moderate dehydration on torque, electromyography, and mechanomyography

The purpose of the present investigation was to test the hypotheses that the mechanomyographic (MMG) signal would be affected by hydration status due to changes in the intra‐ and extracellular fluid content (which could affect the degree of fluid turbulence), changes in the filtering properties of t...

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Bibliographic Details
Published in:Muscle & nerve 2002-08, Vol.26 (2), p.225-231
Main Authors: Evetovich, Tammy K., Boyd, Joseph C., Drake, Shawn M., Eschbach, Lawrence C., Magal, Meir, Soukup, Jeffrey T., Webster, Michael J., Whitehead, Malcolm T., Weir, Joseph P.
Format: Article
Language:English
Subjects:
Adult
Analysis of Variance
Biological and medical sciences
Dehydration - physiopathology
Electromyography
EMG
Female
Fundamental and applied biological sciences. Psychology
Humans
hydration
isokinetic
Isometric Contraction - physiology
Male
MMG
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Muscle Fibers, Skeletal - physiology
Muscle, Skeletal - cytology
Muscle, Skeletal - physiology
strength
Torque
Vertebrates: nervous system and sense organs
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Summary:The purpose of the present investigation was to test the hypotheses that the mechanomyographic (MMG) signal would be affected by hydration status due to changes in the intra‐ and extracellular fluid content (which could affect the degree of fluid turbulence), changes in the filtering properties of the tissues between the MMG sensor and muscle, and changes in torque production that may accompany dehydration. Ten subjects (age 22.5 ± 1.6 years) were tested for maximal isometric (MVC), submaximal isometric (25, 50, and 75%MVC), and maximal concentric isokinetic muscle strength of the biceps brachii in either a euhydrated or dehydrated state while the electromyographic (EMG) and MMG signals were recorded. Separate three‐way and two‐way ANOVAs indicated no change in torque, EMG amplitude, EMG mean power frequency (MPF), MMG amplitude, and MMG MPF with dehydration. The lack of dehydration effect suggests that MMG may be more reflective of the intrinsic contractile processes of a muscle fiber (torque production) or the motor control mechanisms (reflected by the EMG) than the tissues and fluids surrounding the muscle fiber. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 225–231, 2002
ISSN:0148-639X
1097-4598
DOI:10.1002/mus.10203