Final answer:
Microcurrent treatments should never exceed 5 mA to avoid harmful effects such as sustained muscular contractions or more severe outcomes like fibrillation at higher currents.
Step-by-step explanation:
Microcurrent treatment should never exceed currents of 5 mA (milliamperes). The body generally tolerates very small currents without any sensation or harm. It is important to note that the threshold for feeling a current is only 1 mA, and shocks are relatively harmless below 5 mA. Despite being perceived as unpleasant, this level is considered the maximum allowed shock in many safety regulations. Currents ranging from 5-30 mA have the capacity to stimulate sustained muscular contractions, similar to the ones triggered by regular nerve impulses. Additionally, currents of 0.06 A (60 mA) or higher have the potential to be fatal, as they can induce fibrillation of the heart. Therefore, for microcurrent treatments, it's critical to adhere to safety guidelines that cap the current at 5 mA to avoid the risk of such dangerous effects.