Human motor cortex oxygenation during exhaustive pinching task

Abstract There are few observations of the activity of the bilateral motor cortex during prolonged exhaustive motor tasks. Knowing how the motor cortex modulates muscle fatigue or how information about fatigue affects motor cortex activities in healthy humans may help explain why fatigue is so preva...

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Bibliographic Details
Published in:Brain research 2007-07, Vol.1156, p.120-124
Main Authors: Shibuya, Kenichi, Kuboyama, Naomi
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fatigue
Fingers
Functional Laterality
Fundamental and applied biological sciences. Psychology
Hand Strength - physiology
Humans
Motor Activity - physiology
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Motor cortex
Motor Cortex - physiology
Motor task
Muscle Contraction
Muscle, Skeletal - physiology
Neurology
Oxygen Consumption
Oxyhemoglobins - metabolism
Spectrophotometry, Infrared
Vertebrates: nervous system and sense organs
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Summary:Abstract There are few observations of the activity of the bilateral motor cortex during prolonged exhaustive motor tasks. Knowing how the motor cortex modulates muscle fatigue or how information about fatigue affects motor cortex activities in healthy humans may help explain why fatigue is so prevalent in patients with neurological disorders. The purpose of the present study was to investigate the time course of oxygenation of the bilateral motor cortex during an exhaustive pinching task. Eight healthy, right-handed subjects participated in the study. Near-infrared spectroscopy over the bilateral motor cortex was used to measure the activity throughout the pinching task. Subjects performed a sustained 50–60% of maximal voluntary contraction until voluntary exhaustion was reached. After the start of the motor task, the contralateral motor cortex oxygenation increased significantly compared with the resting value ( P < 0.05). However, with the passage of time, it decreased significantly compared with the resting value ( P < 0.05). In addition, ipsilateral motor cortex oxygenation decreased significantly at voluntary exhaustion compared with the resting value ( P < 0.05). These results suggest an interaction between the bilateral motor cortices during motor tasks.
ISSN:0006-8993
1872-6240
DOI:10.1016/j.brainres.2007.05.009