View Full Version : 'Muscle Friction' Revisited

Mel Siff
10-15-2001, 08:06 PM
Some resistance machines manufacturers have contended for years that
so-called "muscle friction" is an important factor for explaining why one can
manage to control larger loads under eccentric conditions than either
concentric or isometric conditions, with even more scientists discounting
this hypothesis. Let us first of all correct use of the word "friction" to
apply strictly to the hydrodynamic realm so that we can examine the continued
contention by some researchers that muscle viscosity indeed plays a very
important role in muscle action.

This commentary quoted below is the sort that has been put forward recently -
would anyone care to comment or suggest any references or counter-references
that address the same topic, particularly the belief that the dominant
difference between eccentric and other forms of muscle action lies in muscle
"friction" (or viscosity)? In such an analysis, it no doubt is important to
compare viscous processes in the explosive eccentric amortisation phase of
typical stretch-shortening and the much more leisurely eccentric lowering of
a barbell by a bodybuilder.