In patients with haemophilia (PwH) repetitive joint bleedings result in a so called haemophilic arthropathy, which is often associated with chronic pain as well as functional restrictions.~Due to the opportunity of sufficient factor treatment regimes, physical activity is no longer considered as a risk factor for PwH. In contrast, the large amount of current scientific evidence demonstrated high benefits of regular exercising for PwH. Meanwhile, physical activity is integrated as recommendation in the ´Guidelines for the management of hemophilia´. Nevertheless, the detailed influence of the exact course of the individual clotting factor level corresponding to the intensity of physical activities in consideration of possible bleeding events in adult PwH have not been examined to date.~The aim of this prospective multicentre study is to evaluate the influence of individual clotting factor level while being physically activie. Hereby the focus is on haemophilic specific parameters such as bleeding events, factor treatment and pain. On the basis of this study, an individualized clotting factor level should be determined which ensures a minimized risk of a bleeding event, considering type and intensity of the exercises. In line with these new findings, further interventional studies could be initiated in order to safely enhance the degraded physical performance as well as quality of life in PwH.~The generated knowledge could be further used in the development of haemophilic specific recommendations regarding physical activity in consideration of the individual clotting factor level.
The aim of this prospective multicentre study is to evaluate the influence of individual clotting factor level while being physically active