I had always assumed it was the ultra fit horses that did it, but on 
Sunday we were told our mare (who only does 25s) was missing 
every 7th beat at the start of the ride, and was still missing a few
beats at the end, but not so regularly. 
She's 12 yrs old, done a couple of seasons of mainly long, slow 
distance (about 7-8mph usually), and this is the first time its
been mentioned, though her heart rate has been much lower this year 
than ever before (32 before the ride, 36 after).
Is there some advantage to missing beats rather than just having a 
slower heart beat?
Sue
sue.cunningham@mcc.ac.uk (work)
sue@snaffle.demon.co.uk (home)
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