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Ipsi- and contralateral frontal cortex oxygenation during handgrip task does not follow decrease on maximal force

Naomi Kuboyama1, Kenichi Shibuya2

  • 1Faculty of Business Administration, Osaka University of Commerce, 4-1-10 Mikuriyasakae-machi, 577-8505, Higashi-Osaka, Japan.

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Fatiguing exercise increases oxygenation in both brain hemispheres. This study reveals greater delayed brain oxygenation in the ipsilateral cortex during maximal handgrip exercise, suggesting complementary cortical interactions.

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Sports Science

Background:

  • The impact of fatiguing exercise on frontal cortex oxygenation in both hemispheres remains unclear.
  • Understanding brain responses to maximal exertion is crucial for performance and recovery.

Purpose of the Study:

  • To investigate frontal cortex oxygenation changes during prolonged, fatiguing, maximal voluntary handgrip exercise.
  • To compare the oxygenation response between the ipsilateral and contralateral hemispheres using near-infrared spectroscopy.

Main Methods:

  • Near-infrared spectroscopy (NIRS) was employed to monitor cerebral oxygenation.
  • Participants performed prolonged, repetitive handgrip exercise at maximal voluntary contraction.
  • Changes in oxyhemoglobin ([HbO2]) and deoxyhemoglobin ([Hb]) concentrations were analyzed.

Main Results:

  • A significant increase in oxyhemoglobin ([HbO2]) was observed in both hemispheres (p < 0.05).
  • A smaller, delayed decrease in deoxyhemoglobin ([Hb]) was also significant (p < 0.05).
  • Delayed oxygenation was more pronounced in the ipsilateral hemisphere compared to the contralateral hemisphere.

Conclusions:

  • Prolonged fatiguing exercise elicits significant bilateral frontal cortex oxygenation changes.
  • The ipsilateral cortex shows a greater delayed oxygenation response than the contralateral cortex.
  • These findings support the concept of complementary interactions between brain hemispheres during maximal fatiguing exercise.