The relationship between the clinical severity of chronic venous insufficiency and the calf muscle pump: A cross-sectional study.

To investigate the connection between the clinical severity of chronic venous insufficiency (CVI) and the biomechanics of the calf muscle pump (CMP). Through a cross-sectional observational study, we analyzed women on the age range between 30 and 80 years with chronic venous insufficiency, stratified according to the clinical classification. Ninety-nine women were assessed and classified into groups with different levels of severity: C1 (n = 22); C2 (n = 22); C3 (n = 22); C4 (n = 22); C5 (n = 8); C6 (n = 3). The main purpose was to invest i gate the strength of the calf muscle pump through total work (TW) and peak torque (PT), and the range of motion (ROM) of the ankle joint. For a secondary analysis, the fatigue index was assessed. All results were run through the Humac® / NORMT isokinetic dynamometer to obtain the data. Our findings pointed out that as the clinical severity of CVI increases, there is a reduction on the PT, the TW, the maximum active ROM and the ROM at 120° / sec. As severity increased, there was a reduction of 24Nm in the TW at 30° / sec.and a reduction of 3Nm in the PT at 30° / sec. When increased, clinical severity of CVI may trigger downgrading in the strength of the CMP and the ROM in the ankle. These findings are of relevance to the clinician, since through these findings, individuals with venous insufficiency may be treated more precisely for each classification. • To the best of our knowledge, this is the first article to investigate the relationship between the clinical severity of chronic venous insufficiency and both the strength and range of motion of the calf muscle. • The assessment method used was the isokinetic dynamometer. • Increasing the clinical severity of chronic venous insufficiency reduces the strength and range of motion in the calf muscle. [ABSTRACT FROM AUTHOR]