Technology Supported High Intensity Training in Chronic Low Back Pain: the Techno-HIT Trial

Chronic low back pain (CLBP) is one of the most common chronic musculoskeletal disorder worldwide and is responsible for the highest levels of disability of all diseases. All state-of-the-art guidelines recommend implementing exercise therapy (ET) in CLBP management. Researchers have shown that a novel ET modality, namely high intensity training (HIT), can be valuable. A clinical evaluation study in a larger spectrum of persons with CLBP in a rehabilitation centre setting is essential. Thereby, technology might support HIT. The primary goal of this clinical trial is to evaluate the short- and long-term effectiveness of a time contingent individualized High intensity training (HIT) protocol on disability compared to moderate intensity training (MIT) in persons with severely disabling chronic low back pain (CLBP). Secondary goals entail 1) evaluating short- and long-term effectiveness of HIT on psychosocial correlates, central pain processing, and broad physical fitness, 2) investigating additional effects of (prolonged) HIT at home, 3) investigating added value of technology through a mobile (smartphone) and dashboard (computer) application that offers support during home training, 4) evaluating cost-effectiveness of (technology supported) HIT compared to MIT. The main research question\[s\] (RQ) it aims to answer are: * RQ1: To what extent is HIT effective on the short- and long term to improve disability in persons with severely disabling CLBP compared to MIT as used in usual care? * RQ2a: To what extent does HIT have a short- and/or long-term effect on central pain processing and psychosocial correlates in persons with severely disabling CLBP? * RQ2b:To what extent does HIT have a short- and/or long-term effect on outcomes related to broad physical fitness in persons with severely disabling CLBP? * RQ3a: To what extent does prolonged (technology-supported) HIT at home provide additional training effects in persons with severely disabling CLBP? * RQ3b:To what ext