研究目的
To use near-infrared spectroscopy (NIRS) to measure the instantaneous muscular oxygenation changes produced by neuromuscular electrical stimulation (NMES) and apply incremental stimulation intensity until painless muscle contractions occur, aiming to determine the optimal NMES current intensity by monitoring oxygenation changes.
研究成果
NIRS can be used to determine the optimal NMES current intensity by monitoring oxygenation changes. A limit exists above which increasing the NMES current intensity produces no additional increases in HbO2 levels, and therefore setting the currents at a level that causes pain for users may be unnecessary. The effect on HbO2 levels persists for more than 1 min, suggesting the possibility of reducing the duration of the stimulation time.
研究不足
The study used only one form of stimulation, and measurement using alternative electrical stimulation methods is necessary to confirm the plateau of HbO2. The total number of participants must be at least doubled to expand the scope of the research.
1：Experimental Design and Method Selection:
The study involved applying NMES to healthy young adults and measuring instantaneous changes in muscle microcirculation and metabolism using NIRS. The stimulation intensity was incrementally increased until muscle contraction occurred without pain.
2：Sample Selection and Data Sources:
Forty-three healthy young volunteers aged between 20 and 35 years were recruited. Participants had no chronic diseases and were not in exercise training programs.
3：List of Experimental Equipment and Materials:
NMES was delivered using the ELPHA Ⅱ 3000 dual-channel electrotherapy system. A commercial NIRS system (PortaLite, Artinis Medical Systems BV, Netherlands) was used to measure hemodynamic and tissue oxygenation changes.
4：Experimental Procedures and Operational Workflow:
Participants were seated with their knees extended, and NMES probes were placed on the tibialis anterior muscle. The NIRS optode was placed on the skin at the midpoint of the two NMES probes. Electrical stimulation was started at 10 mA and increased at a rate of 5 mA/15 s until muscle contraction occurred.
5：Data Analysis Methods:
Changes in oxyhemoglobin (HbO2), deoxyhemoglobin (HHb), and total hemoglobin (tHb) during electrical stimulation were analyzed using one-way ANOVA. A student’s paired t-test was used to determine the difference between the signals produced.
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