Muscle oxygenation dynamics in response to electrical stimulation as measured with near-infrared spectroscopy: A pilot study

Yi Hua Huang, Ming Lung Chuang, Pay Zen Wang, Yueh Chi Chen, Chung Ming Chen, Chia-Wei Sun*

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract

Neuromuscular electrical stimulation (NMES) is used for preventing muscle atrophy and improving muscle strength in patients and healthy people. However, the current intensity of NMES is usually set at a level that causes the stimulated muscles to contract. This typically causes pain. Quantifying the instantaneous changes in muscle microcirculation and metabolism during NMES before muscle contraction occurs is crucial, because it enables the current intensity to be optimally tuned, thereby reducing the NMES-induced muscle pain and fatigue. We applied near-infrared spectroscopy (NIRS) to measure instantaneous tissue oxygenation and deoxygenation changes in 43 healthy young adults during NMES at 10, 15, 20, 25, 30, and 35 mA. Having been stabilized at the NIRS signal baseline, the tissue oxygenation and total hemoglobin concentration increased immediately after stimulation in a dose-dependent manner (P < 0.05) until stimulation was stopped at the level causing muscle contraction without pain. Tissue deoxygenation appeared relatively unchanged during NMES. We conclude that NIRS can be used to determine the optimal NMES current intensity by monitoring oxygenation changes.

Original languageEnglish
Article numbere201800320
JournalJournal of Biophotonics
Volume12
Issue number3
DOIs
StatePublished - 1 Mar 2019

Keywords

  • muscle oxygenation dynamics
  • near-infrared spectroscopy
  • neuromuscular electrical stimulation
  • tissue optics

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