The accuracy of the American College of Sports Medicine metabolic equation for walking at altitude and higher-grade conditions

Dalleck, L.C., Vella, C.A., Kravitz, L., & Robergs, R.A. (2005) The accuracy of the American College of Sports Medicine metabolic equation for walking at altitude and higher-grade conditions. Journal of Strength and Conditioning Research, 19(3), pp. 534-537.

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Abstract

The purpose of this study was to examine the accuracy of the American College of Sports Medicine (ACSM) walking equation at low walking speeds, altitude (1,550 m), and higher grades. Twenty men and women (mean ± SD, age, 28 ± 6 years; height, 171 ± 13 cm; weight, 67.8 ± 18.1 kg) completed 2 randomized testing sessions under altitude (AL) (P IO2 = 123.1 mm Hg [20.93%]) and sea level control (SLC) (P IO2 = 147.3 mm Hg [25.00%]) conditions. Steady-state oxygen uptake (V̇O2) was measured while subjects walked at 50 m·min -1 at 8 separate grades (0, 5, 10, 15, 18, 21, 24, and 27%). Steady-state V̇O2 measurements from the last 2 minutes of each grade in AL and SLC were compared to the predicted V̇O2 of each grade according to the ACSM walking equation. Mean V̇O2 differences between predicted and AL values ranged from -0.5 to 1.4 ml·kg-1·min-1, averaged -0.1 ml·kg-1·min-1 across all grades, and were significant (p < 0.05) at 0 percent grade. Mean V̇O2 differences between predicted and SLC values ranged from 0.6 to 3.0 ml·kg·min-1, averaged 1.4 ml·kg -1·min-1 across all grades, and were statistically significant (p < 0.05) at 0 and 5 percent. The standard error of the estimate (SEE) for the prediction of V̇O2 under AL and SLC were 2.2 and 2.0 ml·kg-1·min-1, respectively. Total errors for the prediction of V·O2max under AL and SLC were 2.3 and 2.6 ml·kg-1·min-1, respectively. Overall, the findings indicate that the current ACSM prediction equation for walking is appropriate for application at low speeds, moderate altitude, and higher grades.

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ID Code: 96857
Item Type: Journal Article
Refereed: Yes
Additional Information: cited By 3
Keywords: adult; altitude; analysis of variance; article; clinical trial; controlled clinical trial; controlled study; exercise test; female; human; lung gas exchange; male; oxygen consumption; physiology; prediction and forecasting; randomized controlled trial; sp, Adult; Altitude; Analysis of Variance; Exercise Test; Female; Humans; Male; Oxygen Consumption; Predictive Value of Tests; Pulmonary Gas Exchange; Sports Medicine; Walking
DOI: 10.1519/1533-4287(2005)19[534:TAOTAC]2.0.CO;2
ISSN: 1064-8011
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: Copyright 2005 National Strength and Conditioning Association
Deposited On: 29 Jul 2016 04:54
Last Modified: 29 Jul 2016 04:54

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