A Simple Approach to Assess VT During a Field Walk Test

A Simple Approach to Assess VT During a Field Walk Test

Author Dourado, Victor Zuniga Autor UNIFESP Google Scholar
Banov, M. C. Google Scholar
Marino, M. C. Autor UNIFESP Google Scholar
Souza, V. L. de Autor UNIFESP Google Scholar
Antunes, L. C. de O. Google Scholar
McBurnie, M. A. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Kaiser Permanente Ctr Hlth Res
Abstract We aimed to examine whether the ventilatory threshold (VT) during an incremental shuttle walk test (ISWT) could be determined using heart rate variability (HRV) analysis. Further aims were to assess variables capable of predicting performance in the ISWT and the intensity of this test. Beat-to-beat RR intervals and gas exchange values in 10 healthy subjects (31-83 years; 7 men) were collected during the ISWT. the ventilatory equivalent was used to assess VT from respiratory components. To determine the HRV threshold (HRVT), the instantaneous beat-to-beat variability values of the RR intervals at each stage of exercise were graphically plotted against walking speed (WS). the oxygen consumption at HRVT was calculated (VO(2)HRVT). No significant differences were found between walking speed (WS) at VT and WS at HRVT (5.04 +/- 1.00 vs. 5.10 +/- 1.04 km/h; p = 0.89). Linear regression analysis revealed a strong correlation between VO(2)VT and VO(2)HRVT (r(2) = 0.896). the Bland and Altman plot analysis revealed an agreement between VO(2)VT and VO(2)HRVT (-0.05; 95 % CI: -0.30-0.20 L/min). Thus, the VT can be assessed during the ISWT using a simple heart monitor. the ISWT may be a useful tool to assess exercise capacity and prescribe walking programs.
Keywords heart rate variability
shuttle walk test
exercise testing
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 2007/08673-3
Date 2010-10-01
Published in International Journal of Sports Medicine. Stuttgart: Georg Thieme Verlag Kg, v. 31, n. 10, p. 698-703, 2010.
ISSN 0172-4622 (Sherpa/Romeo, impact factor)
Publisher Georg Thieme Verlag Kg
Extent 698-703
Origin http://dx.doi.org/10.1055/s-0030-1255110
Access rights Closed access
Type Article
Web of Science ID WOS:000282681000004
URI http://repositorio.unifesp.br/handle/11600/32964

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