Affordable Access

Can accelerometry accurately predict the energy cost of uphill/downhill walking?

Authors
  • Terrier, P.
  • Aminian, K.
  • Schutz, Y.
Publication Date
Jan 01, 2001
Source
Infoscience @ EPFL
Keywords
License
Unknown
External links

Abstract

To evaluate whether an activity monitor based on body acceleration measurement can accurately assess the energy cost of the human locomotion, 12 subjects walked a combination of three different speeds (preferred speed+/-1 km/h) and seven slopes (-15 to + 15% by steps of 5%) on a treadmill. Body accelerations were recorded using a triaxial accelerometer attached to the low back. The mean of the integral of the vector magnitude (norm) of the accelerations (mIAN) was calculated. (V) over dot O-2 was measured using continuous indirect calorimetry. When the results were separately analysed for each incline, mIAN was correlated to V. O2 (average r = 0.87, p < 0.001, n = 36). (V) over dot O-2 was not significantly correlated to mIAN when data were globally analysed (n = 252). Large relative errors occurred when predicted V. O2 (estimated from data of level walking) was compared with measured (V) over dot O-2 for different inclines (- 53% at +15% incline, to + 55% at - 15% incline). It is concluded that without an external measurement of the slope, the standard method of analysis of body accelerations cannot accurately predict the energy cost of uphill or downhill walking.

Report this publication

Statistics

Seen <100 times