Changes in coagulation parameters with exercise in patients with classic hemophilia

Area of Science:

• Hematology
• Exercise Physiology
• Coagulation Disorders

Background:

• Exercise is often recommended for hemophilia management.
• Previous research indicates exercise increases coagulation factors in healthy individuals.
• The impact of exercise on coagulation in hemophilia patients remains understudied.

Purpose of the Study:

• To investigate the effects of maximal voluntary exercise on coagulation parameters in hemophilia patients.
• To determine if exercise influences factor VIII (VIII:C) and factor VIII-related antigen (VIIIR:Ag) levels in hemophiliacs.

Main Methods:

• Eleven hemophilia patients underwent maximal effort exercise on a bicycle ergometer.
• Coagulation parameters, including factor VIII functional activity (VIII:C) and antigenic levels (VIII:CAg), were measured before and after exercise.
• Prothrombin time, fibrinogen, factor II, and factor VII levels were also assessed.

Main Results:

• The entire group showed a decrease in mean prothrombin time.
• Mild hemophiliacs experienced an increase in mean VIII:C and VIII:CAg.
• Severe hemophiliacs did not show significant changes in VIII:C or VIII:CAg.
• Both mild and severe hemophilia patients exhibited significant changes in fibrinogen, factor II, and factor VII.

Conclusions:

• Submaximal exercise can modify coagulation parameters in hemophilia patients.
• The response to exercise-induced coagulation changes may differ between mild and severe hemophilia.
• Further research is needed to fully understand the implications of exercise for hemophilia management.