This proposed study suggests that peripheral tissue acidosis sensed by the somatosensory
system (sngception) would evoke the sng perception in the brain. This hypothesis is based on
investigators preliminary data that the peripheral muscle acidosis will evoked the central
sng perception. In this study, investigators want to determine if there is the correlation
between the flow rate of drug application and sng or pain. Also, they try to find if the pH
of a solution will affect muscle acidosis.