Active recharge phase

For high-frequency stimulation, active recharge can be used to accelerate the recharge speed. A circuit designed to provide active recharge would actively drive both the cathodic and anodic phases. However, at the end of both active phases, the circuit still needs to incorporate a shorting phase, as done in passive recharge. 

It is important to note that active recharge may not reduce the likelihood of electrode corrosion. During the recharge phase, the cathode is positively biased and tends to maintain the positive bias at the end of the stimulation sequence, leaving the electrode susceptible to corrosion. 

Power is normally required to capture responses of the sensor, process and transmit data. While training in a physiological laboratory allows for sensor systems to be electrically supplied by the mains, in the field, power is best supplied by a disposable or rechargeable battery incorporated with the other electronic components of the system. Few sports applications require sleep phases, when the sensors are not required to be active. For most sports, the power requirements in use, whether for training or competition, are continuous but limited to hours as opposed to days. Thus, compared to medical sensors where data sometimes need to be gathered over several days, the power requirements are less stringent, which helps reduce the overall weight of the sensor system. 

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