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KMID : 1142420200180030393
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PNF and Movement
2020 Volume.18 No. 3 p.393 ~ p.401
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Changes in Compound Muscle Action Potential Depending on Pressure Level of Blood Flow During KAATSU Training
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Kim Jong-Soon
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Abstract
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Purpose: In recent years, there has been increasing interest in using blood flow-restricted exercise (BFRE) or KAATSU training. The KAATSU training method, which partially restricts arterial inflow and fully restricts venous outflow in the working musculature during exercise at reduced exercise intensities, has been proven to result in substantial increases in both muscle hypertrophy and strength. The purpose of this study was to investigate the proper level of pressure for KAATSU training using compound muscle action potential (CMAP) analysis.
Methods: Twenty-two healthy adults voluntarily participated in this study. CMAP was conducted by measuring the terminal latency and amplitude using a motor nerve conduction velocity test. For reference-line, supramaximal electrical stimulation was applied to the median nerves of the participants to obtain CMAP for the abductor pollicis brevis. For baseline, the intensity of the electrical stimulation was decreased to a level at which the CMAP amplitude was about a third of the CMAP amplitude obtained by the supramaximal electrical stimulation. The pressure levels for the KAATSU were set as a systolic blood pressure (strong pressure), the median values of systolic and diastolic blood pressure (intermediate pressure), and diastolic blood pressure (weak pressure). In the KAATSU condition, CMAP was performed under the same conditions as baseline after low-intensity thumb abduction exercises were performed at the subjects’ own pace for one minute.
Results: As the pressure increased, the CMAP amplitude was significantly increased, signifying that more muscle fibers were recruited.
Conclusion: This study found that KAATSU training recruited more muscle fibers than low-intensity exercise without the restriction of blood flow.
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KEYWORD
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Blood flow-restricted exercise (BFRE), KAATSU training, Compound muscle action potential (CMAP)
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