Swimming constitutes one of the most demanding sports regarding technique. Years of training are necessary to master each one of the four styles. An important improvement and help for trainers would be a swimsuit that could provide information during training. This paper presents the research undertaken to develop textile sensors that will be used in a swimsuit. This paper will address ECG and respiratory frequency sensors and respective signals. The behaviour of the proposed sensors in different conditions (dry and wet environments) will be presented and discussed. The influence of movement on the signal quality and further interpretation, both by the muscular electrical signals as well as by the displacement of the electrodes, will be addressed. Other very important issue in swimming is drag. One approach that can reduce total drag consists in using compression. However, compressed fabrics will most likely modify the textile sensors’Fundação para a Ciência e a Tecnologia (FCT) - PTDC/EEA-ELC/70803/200
