Exercise concomitant to radiotherapy for stable spinal metastases was demonstrated to increase bone density and reduce pain. In the DISPO-II study, the feasibility of exercise concomitant to radiotherapy for unstable spinal metastases was investigated. Here, a detailed analysis of the training program is presented. Cancer patients with spinal metastases (Taneichi score >= D) were randomly assigned to an intervention group (INT, n = 27, 62 +/- 9 years) or control group (CON, n = 29, 61 +/- 9 years). INT performed spinal stabilization exercises ("all fours"/"plank"/"swimmer"/"band exercise"), and CON received relaxation, daily concomitant to radiotherapy. Exercise attendance rate was 90% in INT and 80% in CON (p = 0.126). Within INT, exercise dose increased significantly (p < 0.001). 54% of patients could not perform "swimmer" in some or all sessions. 42% could not perform "plank" in some or all sessions. 13 and 25% could not perform "all fours" and "band exercise" in some sessions. "Plank" holding time increased in INT and remained unchanged in CON with different development between groups (p = 0.022). Handgrip strength did not develop differently between groups (p = 0.397). The exercise intervention demonstrated high acceptability but required frequent modifications due to pain, weakness and immobility to be feasible for the majority of participants. It enhanced specific muscle strength. Larger trials should now investigate exercise effects on health.

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