Plantar Venous Pump Activity, Generalized Joint Hypermobility, and Foot Mobility in Ballerinas: A Case-Control Study

Area of Science:

• Biomechanics
• Vascular Physiology
• Sports Medicine

Background:

• The plantar venous pump (PVP) is crucial for venous return from the foot.
• Foot mobility is hypothesized to be essential for effective PVP activation.
• Generalized joint hypermobility (GJH) may influence biomechanical functions, including foot mobility.

Purpose of the Study:

• To investigate the impact of GJH on foot mobility and PVP activity in ballerinas.
• To assess the effect of a short-term warm-up exercise on foot mobility and PVP activity in ballerinas with GJH.

Main Methods:

• Prospective study comparing 12 ballerinas with 15 non-dancer controls.
• Assessed foot mobility via navicular drop test and PVP activity (venous diameter, velocity, flow volume) using Doppler ultrasonography.
• Measurements were taken before and after a 10-minute cycling warm-up exercise.

Main Results:

• Ballerinas showed significant changes in navicular height with weight-bearing positions, unlike controls.
• Both groups exhibited significant differences in venous diameter before and after exercise.
• A significant decrease in venous velocity was observed post-exercise in the non-dancer group, and venous volume differed significantly between groups after exercise.

Conclusions:

• GJH does not appear to distinctly affect foot mobility or PVP activity in ballerinas.
• Short-term warm-up exercise did not show a differential influence on foot mobility and PVP activity based on GJH.
• More precise synchronization of navicular drop and venous return measurements may offer further insights into arch tension and venous return dynamics.