Frontal cortex activation during electrical muscle stimulation as revealed by functional near-infrared spectroscopy
Document Type
Journal Article
Keywords
hemoglobin, adult, amplitude modulation, article, brain depth stimulation, brain level, brain oxygenation, brain region, correlational study, electrostimulation, exercise test, frontal cortex, functional electrical stimulation, hemoglobin determination, human, human experiment, male, muscle contraction, muscle excitation, muscle isometric contraction, near infrared spectroscopy, normal human, priority journal, tissue oxygenation, Adult, Brain, Electric Stimulation, Frontal Lobe, Hemoglobins, Humans, Male, Muscle Contraction, Muscle, Skeletal, Oxygen Consumption, Oxyhemoglobins, Prefrontal Cortex, Spectroscopy, Near-Infrared
Faculty
Faculty of Computing, Health and Science
School
School of Exercise and Health Sciences / Centre for Exercise and Sports Science Research
RAS ID
14838
Abstract
This study compared electrical muscle stimulation (EMS) and voluntary (VOL) contractions of the elbow flexors for changes in frontal cortex (FC) oxygenated hemoglobin (∆O2Hb) and deoxygenated Hb (∆HHb) determined by functional near-infrared spectroscopy (fNIRS). Nine healthy men underwent an EMS session with one arm and 24 h later performed VOL exercise with the other arm. For the EMS session, ∆O2Hb increased (P < 0.05) during the exercise performed at 30% of the maximal voluntary contraction (MVC), and thereafter progressively increased (P < 0.05) with increasing the current amplitude, and both variables were correlated (r = 0.68, P < 0.001). In the VOL session, ∆O2Hb did not change from baseline during 30% MVC contractions; however, ∆O2Hb progressively increased (P < 0.05) during 100% MVC contractions, and ∆O2Hb was greater (P < 0.05) during 100% MVC than 30% MVC. ∆O2Hb was greater (P < 0.05) for EMS than VOL at 30% MVC, but no difference in ∆O2Hb was evident between EMS and VOL at the respective maximum intensity. In conclusion, intensity-related increases in FC activation during EMS can be determined using fNIRS.
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Comments
Muthalib, M. , Ferrari, M., Quareshima, V., & Nosaka, K. (2012). Frontal cortex activation during electrical muscle stimulation as revealed by functional near-infrared spectroscopy. Advances in Experimental Medicine and Biology, 737, 45-49. Available here