Test-retest reliability of a portable gas analysis system under free living conditions

Sundar Kumar Veluswamy, Vasudeva Guddattu, Arun G. Maiya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Introduction: K4b2 (COSMED Srl Italy) is a portable device that is considered valid and reliable for measuring oxygen uptake (VO2) and carbon dioxide production (VCO2) 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. VO2 and VCO2 were measured during the tests using K4b2. Results: ICCs for VO2 (ICC & 95% CI: 0.91, 0.72-0.97) and VCO2 (0.91, 0.72-0.97) of walking demonstrated high reliability whereas reliability was moderate for stair climbing (VO2: 0.82, 0.6-0.93; VCO2: 0.73, 0.44- 0.88) and low for descending stairs (VO2: 0.67, 0.33-0.85; VCO2: 0.51, 0.1-0.77). Conclusion: K4b2 is a highly reliable device for VO2 and VCO2 measurement during self-paced walking in free living environment.

Original languageEnglish
Pages (from-to)117-120
Number of pages4
JournalIndian Journal of Physiology and Pharmacology
Volume59
Issue number1
Publication statusPublished - 2015

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Social Conditions
Reproducibility of Results
Walking
Gases
Equipment and Supplies
Carbon Dioxide
Italy
Oxygen
Stair Climbing

All Science Journal Classification (ASJC) codes

  • Physiology (medical)
  • Pharmacology
  • Physiology
  • Medicine(all)

Cite this

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abstract = "Introduction: K4b2 (COSMED Srl Italy) is a portable device that is considered valid and reliable for measuring oxygen uptake (VO2) and carbon dioxide production (VCO2) 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. VO2 and VCO2 were measured during the tests using K4b2. Results: ICCs for VO2 (ICC & 95{\%} CI: 0.91, 0.72-0.97) and VCO2 (0.91, 0.72-0.97) of walking demonstrated high reliability whereas reliability was moderate for stair climbing (VO2: 0.82, 0.6-0.93; VCO2: 0.73, 0.44- 0.88) and low for descending stairs (VO2: 0.67, 0.33-0.85; VCO2: 0.51, 0.1-0.77). Conclusion: K4b2 is a highly reliable device for VO2 and VCO2 measurement during self-paced walking in free living environment.",
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Test-retest reliability of a portable gas analysis system under free living conditions. / Veluswamy, Sundar Kumar; Guddattu, Vasudeva; Maiya, Arun G.

In: Indian Journal of Physiology and Pharmacology, Vol. 59, No. 1, 2015, p. 117-120.

Research output: Contribution to journalArticle

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