Reference an article from the JACC, Vol37, No. 5, 2001 by Mcphail, Spittell, 
Weston and Bailey.
They concluded "Active pedal plantarflexion(toe raises) is an office-based test 
that compares favorably with tredmill exercise for the noninvasive, safe, 
objective and economical assessment of lower extremity arterial occlusive 
disease."

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