Key result
20 Hz electroacupuncture lowers stimulation muscle oxygenation but boosts recovery oxygenation versus 1 Hz and controls.
Why the study?
The effect of electroacupuncture with different frequencies on muscle oxygenation in humans was not well understood.
Does electroacupuncture at different frequencies alter muscle oxygenation in healthy male volunteers?
Does electroacupuncture at different frequencies alter muscle oxygenation in healthy male volunteers?
p-value: p=< 0.05
Electroacupuncture at 20 Hz transiently decreases muscle oxygen supply during stimulation followed by a rebound increase during recovery in healthy volunteers.
20 Hz EA may transiently reduce then enhance local muscle oxygenation in healthy men; leaves open any clinical relevance or patient applicability.
The aim of the present study was to investigate the effect of electroacupuncture (EA) with different frequencies on muscle oxygenation in humans. The subjects were 8 healthy male volunteers. Muscle oxygenation was measured using near-infrared spectroscopy (NIRS). Blood pressure (BP) and heart rate (HR) were monitored simultaneously. After baseline recording, EA was given for 15 min and recovery was measured for 20 minutes. The procedure of EA at 1 Hz, at 20 Hz, and at control followed in the same subjects. Tissue oxygenation index (TOI) decreased during EA at 20 Hz (P < 0.05) and increased during the recovery period. Normalized tissue hemoglobin index (nTHI) also decreased during EA at 20 Hz and increased during the recovery period (P < 0.05), whereas TOI and nTHI in the EA at 1 Hz did not change significantly throughout the experiment. The peak TOI and nTHI values at 20 Hz during the recovery period were higher than the values at 1 Hz and in the control (P < 0.05). BP and HR remained constant. These data suggest that the supply of oxygen to muscle decreased during EA at 20 Hz and increased after EA at 20 Hz, without any changes in HR and BP.
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Kimura et al. (2015) studied Healthy (n=8). Electroacupuncture vs. Control was evaluated on Tissue oxygenation index (TOI) and normalized tissue hemoglobin index (nTHI) (p=< 0.05). Electroacupuncture at 20 Hz decreased muscle oxygenation during stimulation and increased it during recovery compared to 1 Hz and control (P < 0.05).
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