The invention relates to a piezoresistive textile sensor for detecting the heart and respiratory rate, comprising a lower textile layer whereon a conductive ink or paste is deposited such that first conductive strips are defined, said lower textile layer being joined to a second piezoresistive textile layer whereon a second conductive strip is arranged, to which an upper textile layer is then joined, on which conductive inks and/or pastes can be deposited, said piezoresistive textile sensor being used in a system for detecting the heart and/or respiratory rate.