panting/trembling

[guest@endurance.net]

Jo Ann Lawrence barjbassets@worldnet.att.net
  We are training a 5year old mustang gelding for endurance. This horse
has a history of panting and occasionally trembling after riding. This
begins several minutes after the riding has ceased. He has been on
electrolytes a short while and did much better today. We thought it was a
metabolic condition, has anyone seen this? The length and speed of the
work out don't seem to matter. His heartrate comes down quickly in spite
of the panting.