Juvenile Idiopathic Arthritis

Biomechanical diagnostics in children and adolescents with juvenile idiopathic arthritis for individual physical activity promotion (BEWARE project)

Juvenile idiopathic arthritis (JIA) is often associated with impairments in everyday functionality and accompanying physical inactivity. The goal of this study is to early advise children and adolescents with JIA to a safe physical activity in order to prevent impairments and malfunctions. The advice is based on the clinical disease status, patients’ anthropometrics, patients’ self-assessment and on functional analyses, which includes a biomechanical examination with a 3D-motion analysis and a motor function test. Only newly diagnosed JIA patients of the German Center for Pediatric and Adolescent Rheumatology (Garmisch-Partenkirchen) will be included and measured for a minimum of three times in this study.

After a successful study ending, pediatric rheumatologists and pediatricians will get an advisory tool, which allows an adequate physical activity promotion of their patient.

The project is funded by the „Innovationsausschuss des Gemeinsamen Bundesausschuss“.

Project partners:

More information about the project

Prof. Dr. Ansgar Schwirtz | Dr. Josephine Gizik


Biomechanical analysis of daily activity of young patients to assess sports capability

The goal of this study is to evaluate children and adolescents of the Inception Cohort of Newly Diagnosed Patients (ICON) with juvenile idiopathic arthritis (JIA) concerning their everyday functionality and their motor skills. The patients` function will be examined with a 3D-motion analysis system and with a motor function test during two hospital stays in the German Center for Pediatric and Adolescent Rheumatology, Garmisch-Partenkirchen. At the end of their hospitalizations they receive individual recommendations on physical activity based on the “Rheuma und Sport Kompass”.

This is a cooperation project between the German Center for Pediatric and Adolescent Rheumatology (Garmisch-Partenkirchen) and the Associate Professorship of Biomechanics in Sports (TUM).

The project is funded by the „Dr. Melitta Berkemann Stiftung“.

Prof. Dr. Ansgar Schwirtz | Dr. Josephine Gizik | Nadja Krumm

History dependence of muscle action

Active force production of skeletal muscles is dependent on muscle length and the instantaneous rate and direction of length change. However, the basic theories on muscle contraction do not account for the fact that muscular force production is dependent upon the muscle’s contractile history, such that when one type of contraction (e. g. isometric) is preceded by another type (e. g. eccentric/ lengthening contraction) distinctly different forces can be achieved.

Keywords: residual force enhancement, stretch-shortening cycle, eccentric muscle action

Denis Holzer, Florian Paternoster, Dr. Wolfgang Seiberl

DFG-Project: Contractile, elastic, and neural mechanisms of muscular performance enhancement during stretch-shortening cycles.

Cooperation: Prof. Dr. Daniel Hahn (Ruhr-Universität Bochum); Prof. Dr. Tobias Siebert (Universität Stuttgart)