Non Sweaters

ANHYDROSIS

(LACK OF SWEATING)


These horses usually present with dry coats and not uncommonly had a history of hyperhydrosis (free sweating) prior to the onset of anhydrosis. Most theories revolve around either degeneration of the glands producing sweat or reduction in the stimulation (B2 adrenoceptors) required to trigger production of sweat by these glands.


It is common to find increased levels of circulating adrenalin (epinephrine) in these horses suggesting reduced uptake by receptors of this synaptic transmitter.


The syndrome most often occurs in hot humid climates where maximum sweat production is stimulated in an attempt to maintain normal body temperatures.


It is of interest that anecdotal recoveries from this syndrome have been observed in SE Asian racing stables following cervical chiropractic procedures. A comment from an American horse owner that'"' acupuncture was the only treatment to improve her horses anhydrotic situation'"' was also of interest.


I have personally seen permanent alterations to well defined areas of hyperhydrosis (3) and one large area of apparent anhydrosis (1). These followed cervical vertebral mobilisation under anaesthetic (CVMUA).


If these observations are of any significance it would appear that we are seeing the effects of sympathetic alterations most probably centrally located.


I would appreciate knowing of any other experiences along these lines or to the contrary.