Changes in Prefrontal Cortex and Skeletal Muscle Metabolism Associated with Muscle Fatigue: An FNIRS Study

  • Noriyuki OkaEmail author
  • Umer Asgher
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 1201)


手机体育投注平台One of the effective interventions to improve paralysis hand following stroke attack is repetitive exercise. This is a pilot study to confirm changes in brain response when performing the repetitive exercise to the fatigue limit. In this study, a participant flexed and extended his left elbow repeatedly at the 0.5 Hz with a 6.0 kg dumbbell as long as he can continue till the fatigued point. During the exercise, the left biceps and the right prefrontal cortex (rPFC) were recorded and measured simultaneously using functional near-infrared spectroscopy (fNIRS). The corresponding changes in metabolic responses were observed for oxy-hemoglobin (HbO) and deoxy-hemoglobin (HbR) in the biceps, the results shows an increase in HbR and a decrease in HbO due to the task and HbR increases more with muscle fatigue. The recordings in the rPFC show an increase in HbO and a decrease in HbR in the early stages, but HbR increased around the area as the exercise reaches fatigue point (failure to continue). The HbR increase is caused by an increased in neural activity and oxygen supply in the fatigued area. Therefore, this finding also suggests that the rPFC activation is enhanced when exercise load increases.


Repetitive arm exercise Biceps Muscle fatigue Prefrontal cortex (PFC) PFC activation Functional near-infrared spectroscopy (fNIRS) 


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Copyright information

© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2021

Authors and Affiliations

  1. 1.Department of RehabilitationNerima Ken-Ikukai HospitalTokyoJapan
  2. 2.School of Mechanical and Manufacturing Engineering (SMME)National University of Sciences and Technology (NUST)IslamabadPakistan

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