PURPOSE: We explored the accuracy and bias of prediction equations (ACSM and Foster) in older, deconditioned men and women. We also examined the predictors of VO2(max) to further understand which variables affect respiratory fitness in the elderly. METHODS: One hundred seventy-one community dwelling, men (72.6 +/- 4.8 yr) and women (71.0 +/- 5.1 yr) screened in a clinical trial were retrospectively examined. VO2(max) was measured using a standardized protocol with gas exchange measured. Measured VO2 (max) values were compared with prediction equations via mean difference analyses, and bias was explored using Bland-Altman analyses. Regression analysis determined significant predictors of measured VO2 (max). Alpha was P<or= 0.05. RESULTS: In men and women, Foster, 21.6 +/- 5.7 and 17.9 +/- 5.1 mL.kg (-1).min (-1), respectively, was not significantly different from measured VO2 (max), 21.7 +/- 4.8 and 17.3 +/- 4.0, respectively. ACSM overestimated VO2 (max) in men and women, 26.3 +/- 8.2 and 20.9 +/- 7.3, respectively. By using Bland-Altman plots, ACSM showed significant overestimation bias in more fit women (r = 0.29), whereas Foster showed no estimation bias in either gender. Significant predictors of VO2 (max) were gender, BMI, age, treadmill grade, and speed, with an equation R(2) of 0.70. A measure of current activity levels did not make it into the final model ( P= 0.0505) but is worthy of future consideration using more sensitive measures than ours. CONCLUSION: ACSM is not appropriate for use when treadmill testing older adults. We believe the Foster equation's VO2 (max) prediction accuracy is acceptable, showing no bias along a continuum of aerobic capacity.
PURPOSE: We explored the accuracy and bias of prediction equations (ACSM and Foster) in older, deconditioned men and women. We also examined the predictors of VO2(max) to further understand which variables affect respiratory fitness in the elderly. METHODS: One hundred seventy-one community dwelling, men (72.6 +/- 4.8 yr) and women (71.0 +/- 5.1 yr) screened in a clinical trial were retrospectively examined. VO2(max) was measured using a standardized protocol with gas exchange measured. Measured VO2 (max) values were compared with prediction equations via mean difference analyses, and bias was explored using Bland-Altman analyses. Regression analysis determined significant predictors of measured VO2 (max). Alpha was P<or= 0.05. RESULTS: In men and women, Foster, 21.6 +/- 5.7 and 17.9 +/- 5.1 mL.kg (-1).min (-1), respectively, was not significantly different from measured VO2 (max), 21.7 +/- 4.8 and 17.3 +/- 4.0, respectively. ACSM overestimated VO2 (max) in men and women, 26.3 +/- 8.2 and 20.9 +/- 7.3, respectively. By using Bland-Altman plots, ACSM showed significant overestimation bias in more fit women (r = 0.29), whereas Foster showed no estimation bias in either gender. Significant predictors of VO2 (max) were gender, BMI, age, treadmill grade, and speed, with an equation R(2) of 0.70. A measure of current activity levels did not make it into the final model ( P= 0.0505) but is worthy of future consideration using more sensitive measures than ours. CONCLUSION: ACSM is not appropriate for use when treadmill testing older adults. We believe the Foster equation's VO2 (max) prediction accuracy is acceptable, showing no bias along a continuum of aerobic capacity.
Authors: Zvinka Z Zlatar; Keith M McGregor; Stephen Towler; Joe R Nocera; Joseph M Dzierzewski; Bruce Crosson Journal: Front Aging Neurosci Date: 2015-02-03 Impact factor: 5.750
Authors: Antonio Eduardo Monteiro de Almeida; Charles de Moraes Stefani; João Agnaldo do Nascimento; Narla Miranda de Almeida; Amilton da Cruz Santos; Jorge Pinto Ribeiro; Ricardo Stein Journal: Arq Bras Cardiol Date: 2014-09-12 Impact factor: 2.000
Authors: Jane C Hurley; Kevin E Hollingshead; Michael Todd; Catherine L Jarrett; Wesley J Tucker; Siddhartha S Angadi; Marc A Adams Journal: JMIR Res Protoc Date: 2015-09-11