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  • Title: The accuracy of the ACSM stair-stepping equation.
    Author: Latin RW, Berg K, Kissinger K, Sinnett A, Parks L.
    Journal: Med Sci Sports Exerc; 2001 Oct; 33(10):1785-8. PubMed ID: 11581567.
    Abstract:
    PURPOSE: The purpose of this study was to determine the accuracy of the ACSM equation used to estimate the oxygen cost of stepping exercise. The equation appears as: VO2 (mL.kg(-1).min(-1)) = 0.2 (steps.min(-1)) + (step height, m x steps.min(-1) x 2.4) + 3.5. METHODS: Subjects were 55 men and women between the ages of 19 and 35 yr. Steady-state VO2 was measured at six different combinations of step heights and step rates. Step heights were 0.1, 0.2, and 0.3 m (4, 8, and 12 in, respectively) and step rates were 20 and 25 steps.min(-1). Predicted VO2 for each workload was derived from the ACSM equation. RESULTS: Mean differences between actual and predicted VO2 values ranged from -0.2 to -1.1 mL.kg(-1).min(-1) and was -0.6 mL.kg(-1).min(-1) for all workloads combined. All differences except the lowest were significant (P < or = 0.05). Total errors ranged from 1.3 to 2.5 mL.kg(-1).min(-1) and was 1.9 mL.kg(-1).min(-1) for all workloads combined. For all workloads combined, the correlation between actual and predicted VO2 was r = 0.95 with a SEE = 1.7 mL.kg(-1).min(-1). The statistics are comparable to other ACSM prediction equations. CONCLUSION: Although all of the mean differences except one were statistically significant, they were judged negligible from a practical standpoint. Therefore, it was concluded that the ACSM equation is an accurate predictor of the oxygen cost of stair-stepping exercise.
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