Electronic Devices Boris Siraiy, Roman Trobec 8 1 2019 https://doi.org/10.6025/ed/2019/8/1/1-6 http://www.dline.info/ed/fulltext/v8n1/edv8n1_1.pdf In this paper we show how it is possible to measure ECG signal with telemetric ECG body-sensor during physical activity in regular conditions. Based on previous studies we choose position and type of fixation for sensor. Participant made three different tests, first test was shuttle run test where speed of running was increased every minute, second test was Cooper 2400 m test, and third test was 100 m maximal sprint. We measure ECG signal in all three tests and analyse it with special software for Holter analysis.