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Hey Sky...my first question would be about your wife's hydration. That could affect her HR.
Secondly...I might would check with my doc...178 seems a bit excessive for someone in pretty good shape. Although if she was pushing herself hard she could acheive this. The only problem with super high heart rates is that your heart works less effectively because there is not enough time for it to fill properly between beats. I wouldn't expect to see this unless there was something else going on such as hyperthyroid or dehydration etc.
I'm not a doc, so take that with a grain...
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The sad thing is... as you get older you come to realize that you don't so much pilot your life, as you just try to hold on, in a screaming, defiant ball of white-knuckle anxious fury 
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