. Author manuscript; available in PMC: 2009 Oct 8.

Published in final edited form as: J Vasc Surg. 2008 Jun 24;48(3):644–649. doi: 10.1016/j.jvs.2008.04.005

Table III.

Association between measures of calf muscle hemoglobin oxygen saturation (StO₂) and exercise performance in 39 peripheral arterial disease patients with intermittent claudication.

Variables	ABI	IW	ICD	ACD
StO₂ at rest	0.059	0.005	0.294	0.043
Initial Decline Constant (IDC)	-0.052	-0.287	0.172	0.331 ^*
Minimum exercise StO₂	0.167	-0.004	0.403 ^*	0.136
Predicted Time to minimum exercise StO₂	-0.206	-0.070	-0.205	0.030
Measured Time to minimum exercise StO₂	0.289	-0.493 ^**	0.339 ^*	0.680 ^***
Time Delay in reaching minimum exercise StO₂	0.376 ^*	-0.464 ^**	0.261	0.659 ^***
Absolute Drop in StO₂ during exercise	0.105	0.066	-0.150	-0.010
Relative Drop in StO₂ during exercise	-0.202	0.016	-0.475 ^**	-0.157
Average Rate of Decline in StO₂ from rest to minimum exercise value	-0.258	0.471 ^**	-0.172	-0.583 ^***
Recovery Half-Time of StO₂	-0.316	0.531 ^***	-0.598 ^***	-0.491 ^**
Recovery Time of StO₂	-0.280	0.461 ^**	-0.540 ^***	-0.475 ^**
Recovery Time to Maximal StO₂	-0.161	0.275	-0.454 ^**	-0.261
Maximum recovery StO₂	0.229	0.029	0.448 ^**	0.145

Values are either Pearson partial correlation coefficients or Spearman partial correlation coefficients (indicated in italicized print) adjusted for sex, race, and IDC Group.

p < 0.05,

^**

p < 0.01,

^***

p < 0.001.