Veluswamy, Sundar Kumar and Guddattu, Vasudeva and Maiya, Arun G (2015) Test-retest reliability of a portable gas analysis system under free living conditions. Indian Journal of Physiology and Pharmacology, 59 (1). pp. 117-120.

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Abstract

Introduction: K4b2 (COSMED Sri Italy) is a portable device that is considered valid and reliable for measuring oxygen uptake (V02) and carbon dioxide production (VC02) under laboratory conditions. Objectives: Evaluate the test-retest reliability of K4b2 during walking, stair climbing and descending stairs under free living conditions. Methods: Twelve participants completed two self-selected comfortable paced walking tests. and 20 participants completed two self-selected comfortable paced stair climbing and descending tests. V02 and VC02 were measured during the tests using K4b2. Results: ICCs for V02 (ICC & 95% CI: 0.91, 0.72-0.97) and VC02 (0.91,0.72-0.97) of walking demonstrated high reliability whereas reliability was moderate for stair climbing (V02: 0.82, 0.6-0.93; VC02: 0.73, 0.44-0.88) and low for descending stairs (V02: 0.67, 0.33-0.85; VC02: 0.51, 0.1-0.77). Conclusion: K4b2 is a highly reliable device for V02 and VC02 measurement during self-paced walking in free living environment.

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