[QUOTE=marta;2829799]
can you elaborate on the answers he gave regarding use of human strips on horses?
i use a human hr monitor on my mare. just started last summer. i found that i sometimes got a double reading (another words 198 instead of 94). i wonder whether it’s something he explained?
i am thinking of buying a ‘real’ horse hr monitor for next season and using this one myself;0[/QUOTE]
Well, I hesitate to post his full reply on a public BB, but if the following doesn’t answer the question, I can PM you.
I’m a nurse, so I’m kind of filling in the blanks on this one.
A HRM (human or equine) works by using electrodes (2) placed in spots that can tranmit to each other “through” the heart. If you’ve ever had an EKG you’ve noticed there are three “leads” – two + a “ground.” That’s how they get all those cool patterns that the rich heart doctor can read.
Well, because the human chest is very small compared to a horse, the placing of the two “main” electrodes is only about 8" apart. But (obviously) a horse’s conformation and heart placement is much different. The heart is deeper into the chest and you don’t have the “flat” accessibility that you do with a human.
So if you look at the way a Horse HRM is placed, one electrode goes next to the heart (on the left side of the horse, behind the elbow), but the other is up high – almost under the saddle pad. Check out VMax’s site – they have photos (since I don’t have a HRM yet I’ll have to take his word for it…). You need to place the electrodes this far apart for them to work properly, ie, give you an accurate reading.
That’s why the human HRM isn’t working right for you. You may be getting ALOT of wrong numbers. The only way to know for sure is to have someone on the ground double-checking the rate with a stethoscope while you watch the monitor.
I learned about how “deep” a horse’s heart is when a friend of mine asked me to volunteer at a ride he was managing, doing P&Rs. He figured, since I was a nurse it would be a piece of cake!
So I show up with my cheezy $15 stethoscope and can’t hear heartbeat #1!! Luckily, I knew the vet at the ride and I ran to her – thought maybe I was deaf or sorely lacking in knowledge of equine anatomy (“the horse’s heart IS on the left side, right?”). Well, she took one look at my cheapie stethoscope and said, “of COURSE you can’t hear it with that piece of crap…”
She loaned me one of her extra Littmans (brand name) and all of a sudden my hearing was restored!!
And the whole reason was because a horse’s heart is so deep (compared to ours) that you need a ‘better’ stethoscope to hear it than you would a human heart.
So for those who want to test HR the old fashion way, spend at least $40 -50 on the stethoscope.
Anyway, he also said the HRM can also cause girth sores because people stuff it under the girth and it can rub.
Really, the guy at VMax is a wealth of information. AND he answered my email very promptly, considering it was the day after Thanksgiving. That, and the fact he is an endurance rider himself, made me choose his HRM over the others. Can’t wait till it gets here!
Hope that helped…