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Hi Sashen
I don't have direct experience with track athletics, but the overload principles are the same as with all forms of training.
When you train hard, you stress your body, breaking it down somewhat. This training stress is reflected via the autonomic nervous system as reduced HRV, and a lower ithlete daily HRV reading.
The harder, more intensely you workout, the bigger the dip in HRV. During recovery, your HRV increases again, and often supercompensation takes you past your starting point to a new higher level.

As said, I'm not an expert on sprint training, but found an interesting thread discussing HRV for strength & conditioning on www.8weeksout.com, in particular a quote from Lyle McDonald who has written extensively on overreaching & overtraining at www.bodyrecomposition.com :

"A friend of mine (Sprint Coach in Canadia) has used HRV to track some of his athletes. HE found that at the beginning of a 10 day taper, HRV was depressed. After the taper, HRV has returned to normal and his athletes ran PR's. So it's fairly sensitive. He's also seen HRV crater right before an athlete came down being sick."

Another coach familiar with HRV for strength & power is Landon Evans, who also contributed to the 8weeksout thread.

I'm in the late stages of preparing a downloadable free booklet on training with HRV that features an interview with Landon & other well respected coaches. I'll post a note when its ready, hopefully 2-3 wks.

I use the ithlete in conjuction with the TRAC program from Mike Tuchscherer to help guide my training for powerlifting. I had been on the fence for a short while till I saw a post by Landon on EliteFTS praising the app. So far I really like it, I feel like it is helping me to keep myself in check and healthy while still getting stronger. I would be very interested to see the e book with Landon and that would be really awesome if you can get Lyle's input as well.

Thanks
Matt

Hi Matt

That sounds like a great performance, especially so soon after reconstructive surgery!

Thanks for the feedback about ithlete's usefulness in power sports, and I hope it continues to play a role in keeping you injury free. Let us know what goodies you would like to see!