Estimation of Maximal Work Rate Based on the 6-Minute Walk Test and Fat-Free Mass in Chronic Obstructive Pulmonary Disease

Author(s)

Cavalheri, Vinicius ^{[1, 2]} ; Hernandes, Nidia Aparecida ^{[1, 2]} ; Camillo, Carlos Augusto ^{[1, 2]} ; Probst, Vanessa Suziane ^[3] ; Ramos, Dionei ^[2] ; Pitta, Fabio ^{[1, 2]}

Affiliation

^[1] Univ Estadual Londrina, Dept Fisioterapia, Lab Pesquisa Fisioterapia Pulm, Londrina, Parana - Brazil

^[2] Univ Estadual Paulista, Dept Fisioterapia, Programa Mestrado Fisioterapia, Sao Paulo - Brazil

^[3] Programa Associado UEL UNOPAR, Programa Mestrado Ciencias Reabilitacao, Londrina, Parana - Brazil

• Document type: Journal article
• Source: ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION; v. 91, n. 10, p. 1626-1628, OCT 2010.
• Web of Science Citations: 11

Abstract

Cavalheri V, Hernandes NA, Camillo CA, Probst VS, Ramos D, Pitta F. Estimation of maximal work rate based on the 6-minute walk test and fat-free mass in chronic obstructive pulmonary disease. Arch Phys Med Rehabil 2010; 91:1626-8. Objective: To propose a predictive equation of the maximal work rate (Wmax) in patients with chronic obstructive pulmonary disease (COPD) based on the product of 6-minute walking test (6MWT) and fat-free mass (FFM) and to compare it with a previously proposed equation based on the product of 6MWT and body weight (BW). Design: Descriptive (cross-sectional) study. Setting: University-based rehabilitation center. Participants: Patients with COPD (N=53; 30 men; forced expiratory volume in I second, 45%+/- 15% predicted). Interventions: Not applicable. Main Outcome Measures: Three Wmax were produced: Wmax\_real (obtained from the maximal cycle ergometry test), Wmax\_BW (estimated from the product of 6MWT and BW), previously proposed by Hill et al. (Arch Phys Med Rehabil 2008; 89(9):1782-7); and Wmax\_FFM (estimated from the product of 6MWT and FFM). Results: The equation derived from a regression model to estimate Wmax\_FFM was as follows: -27.9717+ 3.7792{*}(6MWT{*}FFM). Wmax\_real correlated better with Wmax\_FFM (r=.64) than with Wmax\_BW (r=.54). There was no difference between Wmax\_FFM (median {[}interquartile range], 41 {[}29-50] W) and Wmax\_real (40 {[}20-50] W, P=.88), whereas Wmax\_BW (60 {[}52-69] W) significantly overestimated Wmax\_real (P<.0001). Conclusions: In patients with COPD, Wmax is better estimated by an equation including the product of 6MWT and FFM than by a previously proposed equation including the product of 6MWT and body weight. (AU)

• FAPESP's process: 09/04246-9 - Effects of hydration on the autonomic modulation and cardiorespiratory parameters during and after physical exercise of long duration
• Grantee: Isadora Lessa Moreno
• Support Opportunities: Scholarships in Brazil - Master