Are peripheral lymphatics damaged by high pressure manual massage?

Area of Science:

• Physiology
• Lymphatic System Research
• Edema Studies

Background:

• Lymphedema and post-thrombotic venous edema significantly impair lymphatic function.
• Understanding the mechanical effects of massage on lymphatic vessels is crucial for therapeutic applications.

Purpose of the Study:

• To investigate the impact of forceful external pressure massage on lymphatic structures in healthy individuals and those with edema.
• To elucidate the mechanisms by which massage affects fluid and fat cell translocation in lymphedematous limbs.

Main Methods:

• Massage applied to male feet and canine hindpaws at 70-100 mmHg for 1-10 minutes at 25 strokes/min.
• Evaluated lymphatic response in healthy subjects, dogs with experimental lymphedema, and men with post-thrombotic venous edema.
• Microscopic examination to assess damage to initial lymphatics and lymphatic collectors.

Main Results:

• Forceful massage (≥10 min) caused focal lymphatic damage in all groups, more pronounced in edematous subjects after 3-5 min.
• Initial endothelial damage occurred, followed by alterations in lymphatic collectors.
• Massage translocated interstitial fluid into lymphatic lumens via open junctions and induced lymphatic wall injury.
• Vigorous massage loosened subcutaneous tissue, created channels, and released lipids, aiding fat cell reduction in lymphedematous legs.

Conclusions:

• High-pressure massage can induce lymphatic damage, particularly in edematous limbs.
• Massage facilitates fluid and lipid translocation in lymphedema by altering lymphatic structures and connective tissue.
• These mechanisms suggest a therapeutic benefit of massage in reducing fat cell accumulation in lymphedematous legs.