With regards to the creatine phosphate resynthesis question, the recovery is
dependent on the cellular pH.  There is a great 31MR study by Arnold et al.
that all physiologists need to read.

Arnold D.L. et al. J. Magn. Reson. Med. 1(3):307-315, 1984.

Your estimate of a half time to recovery for exercise conditions that are
not associated with acidosis is correct.  However, for durations to fatigue
approximating 4 min, there will be acidosis and you will have a half time to
recovery of 2 to 3 times as long.  The bottom line though is that this topic
is poorly (inadequately)researched, yet it is of vital importance to
intermittent intense exercise performance!!
 
Rob Robergs

 

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