84 TABLE V STATISTICS FOR TWITCH CHARACTERISTICS VERSUS BLOOD GASES Group T Rt 1/2 dP/dt -dP/dt Ct p= r2= P= r2= p= r2= P= r2= P= r2= Art [H+] A . 4 .001 00 00 . 8 .09 .17 B .25 .06 . 26 .07 .1 C . 33 .29 .4 .15 .22 ven [H+] A . 78 .002 .85 . 72 .2 .31 B . 77 .13 . 75 .23 .03 .56 C . 59 .26 .11 .24 .26 PaC02 A . 25 .001 . 89 .57 .05 .52 .13 B .04 .56 .04 .44 .04 .4 .01 .75 .25 C .2 .13 . 15 .04 . 89 .06 Significance values are given for correlations between twitch characteristics and blood gases. R2 values indicating the percent of variability explained by the variable are given for significant correlations (p<.05). Groups are as defined in the legend for Table IV.