Kinetic energy is an attractive energy source for low power wearable systems. Several kinetic energy micro generators have already been modeled and fabricated. However, they have not been evaluated in the context of typical wearable computing scenarios. This paper presents an experimental approach towards such an evaluation. For the evaluation, acceleration measurements were performed on several human test subjects while walking on a treadmill. Acceleration was measured and recorded at different points of the body. Subsequently, the amount of available output power was calculated based on a simple mechanical model. Based on the measured waveforms the upper limit of the output power is estimated to be around 200 ?W depending on the mounting position of the generator on the human body.