Evaluation of forces on muscles and intervertebral joints during active kyphosis-deepening exercises in the dynamic individual stimulation and control for spine device (DISC4SPINE, D4S): a modeling approach—proof of concept study. - Szurmik, Tomasz; Bibrowicz, Karol; Nowakowska-Lipiec, Katarzyna; Zadoń, Hanna; Michnik, Robert; Mitas, Andrzej Waldemar (Frontiers in Sports & Active Living, 2025)