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Figure 4 The brachial artery diameter before and after 5 min of low-frequency ultrasound (US) exposure. On the vertical axis is brachial artery diameter; on the horizontal axis is the time after ultrasound exposure (immediately, 3 min, and 5 min after ultrasound). Percentages were expressed as relative changes from baseline ([diameter change/baseline diameter] x 100). *p < 0.001; mean ± SEM (mm), n = 20.
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