In the doctoral thesis, the generation of electrical energy from involuntary human movements, known as energy harvesting, is researched. The work studies the individual components of the implementable power source, guiding the research based on their mutual compatibility. The electromagnetic generation principle has been selected, the operation of a harvester of a specific design has been characterized, the prerequisites for boosting the voltage to a usable level have been determined, and a method for the optimization of its rectification stage has been proposed. Finally, the insights and results of the research are practically combined to improve the performance of the created low-power source and evaluate it experimentally. Among them, the creation of a hybrid energy harvester was tested by improving individual operating parameters, which could not be achieved with individual improvements of the given electromagnetic harvester. A system for measuring environmental parameters has been created for the evaluation of practical use of the obtained power source, the system adjusts its consumption to accommodate the variable available electrical energy.