The peak exercise capacity of patients with PAD
has been reported to be in the range of 4-5 METs,I and our subjects on entry had a peak Vo2 of 12.8
ml/kg/min or 3.7 METs. This level of impairment is
equivalent to cardiac functional Class II1I-V.36,37
Patients with this peak exercise capacity are able to
perform only very light or light activities such as
driving a car, desk work, and self-care.5 Moderate
activities such as climbing stairs, gardening, and
dancing require a range of 5-7 METs, and heavy
activities such as hiking, swimming, and jogging may
require 9 or more METs. Thus, even a modest
improvement in peak exercise performance and Vo2
from exercise training may significantly improve the
functional status of the patient.