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Scientific Study

Running Algorithm Accuracy Testing

VO2 estimate from GoX Studio vs. Cosmed, April 2016

Dr. Lanny Griffin, Biomed, CalPoly, Analysis and Model Development

Objective: The purpose of this study was to modify the PKSE to include running.

Methods: Four subjects (3 female, 1 male) participated in this test. The subjects walked at a constant 1.112 m/s pace on a level treadmill for 5 minutes, then increased their pace to 1.56 m/s for 3 minutes, then increased their pace to 2.24 m/s for 3 minutes, then increased their pace to 2.68 m/s for 3 minutes, then a 5 minute cool down at 1.112 m/s. The heart rate, respiration rate, and VO2 were measured using Cosmed. We normalized the energy expenditure by the body mass. VO2 was converted to watts and normalized by body mass.

Results and Discussion: This particular iteration is quite strong (R2 = 0.95). We tested the model using data from the pilot study. The results are tabulated in table 1. In general, the model tends to underpredict, but the data are generally within 8 percent.

Table 1: PKSE predictions for metabolic cost for subject