Abstract
Purpose
Near-infrared spectroscopy (NIRS) can be used to examine bilateral motor cortex activation during a sustained motor task in brain areas where increased oxygenation reflects cortical activation. This study examines the time course of activation of the bilateral motor cortex during a moderate-intensity handgrip task.
Methods
Ten healthy right-handed male subjects participated in this study. Functional NIRS probes were placed over the cortex to measure motor cortical activations while the subjects performed a 180-s handgrip task incrementally [30–60 % of the maximal voluntary contraction (MVC) at 0.17 % increase/s]
Results
Contralateral primary motor cortex (ContraM1) oxygenation values significantly increased from baseline between 40 and 120 s after the start of the motor task (p < 0.05). Moreover, the ipsilateral primary motor cortex (IpsiM1) oxygenation values significantly increased from baseline between 140 and 180 s after the start of the motor task (p < 0.05). IpsiM1 oxygenation gradually increased from 140 to 180 s, whereas ContraM1 oxygenation gradually decreased from 120 to 180 s after the start of the motor task.
Conclusion
These results suggest that the complementary functions of IpsiM1 become activated in response to the working of the ContraM1 during a continuous handgrip task.
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Abbreviations
- CAR:
-
Common average reference
- CST:
-
Corticospinal tract
- EEG:
-
Electroencephalography
- fMRI:
-
Functional magnetic resonance imaging
- Hb:
-
Deoxyhemoglobin
- HbO2 :
-
Oxyhemoglobin
- M1:
-
Primary motor cortex
- MVC:
-
Maximal voluntary contraction
- NIRS:
-
Near-infrared spectroscopy
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Acknowledgments
This work was partly supported by a Grant-in-Aid for Young Scientists (B, No. 21700641) from the Japan Society for the Promotion of Science (N.K.).
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Communicated by David C. Poole.
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Shibuya, K., Kuboyama, N. & Yamada, S. Complementary activation of the ipsilateral primary motor cortex during a sustained handgrip task. Eur J Appl Physiol 116, 171–178 (2016). https://doi.org/10.1007/s00421-015-3262-1
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DOI: https://doi.org/10.1007/s00421-015-3262-1