Hakkinen, A., Sokka, T., Lietsalmi, A., et al. (2003). Effects of dynamic strength training on physical function, Valpar 9 work sample test, and working capacity in patients with recent-onset rheumatoid arthritis. Arthritis & Rheumatism, 49(1), 71-77.

Individuals with rheumatoid arthritis often experience a decline in physical function. This decline is often associated with inflammation, pain, fatigue, muscle weakness and atrophy, and limited range of motion. Many of these symptoms and limitations can decrease the ability to maintain employment as well as independence. The purpose of this study was to examine a 24-month strength-training program on working capacity as measured by the Valpar 9 test.