Int J Angiol 2015; 24(01): 25-34
DOI: 10.1055/s-0035-1544223
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

A Near Infrared Spectroscopy-Based Test of Calf Muscle Function in Patients with Peripheral Arterial Disease

Brian Lindegaard Pedersen
1   Department of Vascular Surgery, Rigshospitalet and Gentofte Hospital, Copenhagen, Denmark
,
Niels Bækgaard
1   Department of Vascular Surgery, Rigshospitalet and Gentofte Hospital, Copenhagen, Denmark
,
Bjørn Quistorff
2   Department of Biomedical Sciences, University of Copenhagen, The Panum Institute, Copenhagen, Denmark
› Author Affiliations
Further Information

Publication History

Publication Date:
09 February 2015 (online)

Abstract

Background The study aims to test a new, simple, and reliable apparatus and procedure for the diagnostics and treatment evaluation of peripheral arterial disease (PAD). The test apparatus involves near infrared spectroscopy (NIRS) of a main part of the lower leg muscles during isometric flexion and extension of the ankle joint performed with the foot strapped in a specially designed pedal ergometer.

Design To evaluate the reproducibility of the new test compared with an existing testing method of treadmill walking.

Methods Eleven patients participated in the study: nine patients with claudication and two age-matched patients without claudication. Each patient was tested with an isometric ergometer pedal test and a treadmill test applying NIRS measurements of the anterior tibial and the gastrocnemius muscles (GAS). Tests were repeated three times with randomly selected intervals between individual test runs. Intraclass correlation constant (ICC) was used to describe reproducibility. The ICC was calculated using the area under the NIRS oxygenated hemoglobin (Hbox) curve, the initial velocity of the Hbox recovery curve, force measurements, and walking time.

Results The ICC of the GAS was between 0.92–0.95 (foot-pedal) and 0.70–0.98 (tread mill) and of the anterior tibial muscle was between 0.87–0.96 (foot-pedal) and 0.67–0.79 (tread mill).

Conclusion In this study, we contribute a new apparatus and test protocol for peripheral arterial disease (PAD) applying NIRS technique and controlled physical activity to evaluate the degree of muscle oxygenation under specific functionally relevant conditions. Thus, we have developed a clinically applicable “easy-to-do” exercise test of patients with chronic PAD which show high reproducibility.

 
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