Abstract
The purpose of the present study was to investigate the relationship between submaximal muscle force and oxygenation in the motor cortex of the human brain using near infrared spectroscopy (NIRS). Nine healthy subjects performed isometric handgrip contractions ranging from 10 to 50% of maximum voluntary contraction (MVC) in a 30-s exertion with a 60 s of recovery for three repetitions. Motor cortex activity was quantified with NIRS-derived parameters. We showed significant positive linear and non-linear relationships between muscle force output and total- and oxy-hemoglobin (R >0.98, P < 0.01). Overall, our findings showed that submaximal muscle force and brain activity revealed with NIRS strongly correlate in the motor cortex area, both at group and at subject level from 30% MVC. We concluded that motor-related cerebral cortex in human brain function by NIRS encoded force amplitude during motor task linearly from 30% MVC.
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Acknowledgments
This study was supported by research funds of both the Languedoc-Roussillon Region Council and the French University Institute. The authors would like to acknowledge the contribution of François Alexandre for his assistance in collecting the data.
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Derosiere, G., Perrey, S. (2012). Relationship Between Submaximal Handgrip Muscle Force and NIRS-Measured Motor Cortical Activation. In: Wolf, M., et al. Oxygen Transport to Tissue XXXIII. Advances in Experimental Medicine and Biology, vol 737. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1566-4_40
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DOI: https://doi.org/10.1007/978-1-4614-1566-4_40
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