Description

A model to predict oxygen consumption (mL/kg/min) during walking was developed in adults in the laboratory and cross-validated in a sub-sample of participants on an outdoor trail. The model uses acceleration and vertical upward and downward speed, as determined by changes in barometric pressure, as inputs. Correlation between predicted and actual oxygen consumption was 0.879 with a mean difference of -0.2 mL/kg/min.

Development/Validation

Sample: 42 (21 males) healthy adults, 63±7 years of age

Setting: Laboratory

Activities: Stationary, treadmill walking

Criterion: MetaMax 3b (VO₂)

Accelerometer(s): ADXL210JE on right or left waist

Validation approach: Cross-validation using additional visit by sub-sample of participants who walked on an outdoor trail

Phase Designation

(What's this?)

This model is in Phase 1.

Instructions

A model to predict oxygen consumption (mL/kg/min) from vector magnitude (VM in g), vertical upward speed (Hu in m/min), and the vertical downward speed (Hd in m/min) is provided. VM is an integration of total acceleration (square root of the sum of the squared acceleration in each axis) for the period minus VM during rest. Hu and Hd were calculated either using an equation incorporating treadmill speed (m/min) and incline (%) (left) in the laboratory or using changes in device-measured barometric pressure in field-based observations (right).

Source Information

Yamazaki, T., Gen-No, H., Kamijo, Y. I., Okazaki, K., Masuki, S., & Nose, H. (2009). A new device to estimate VO2 during incline walking by accelerometry and barometry. Medicine and Science in Sports and Exercise, 41(12), 2213-2219. https://doi.org/10.1249/MSS.0b013e3181a9c452 Link to Paper

Corresponding author: Hiroshi Nose, nosehir@shinshu-u.ac.jp

Contact

Kimberly Clevenger at accelerometerrepository@gmail.com