Optimal calibration of instrumented treadmills using an instrumented pole

L.H. Sloot, H. Houdijk, M. M. van der Krogt, J. Harlaar

Research output: Contribution to JournalArticleAcademicpeer-review


Calibration of instrumented treadmills is imperative for accurate measurement of ground reaction forces and center of pressure (COP). A protocol using an instrumented pole has been shown to considerably increase force and COP accuracy. This study examined how this protocol can be further optimized to maximize accuracy, by varying the measurement time and number of spots, using nonlinear approaches to calculate the calibration matrix and by correcting for potential inhomogeneity in the distribution of COP errors across the treadmill's surface. The accuracy increased with addition of spots and correction for the inhomogeneous distribution across the belt surface, decreased with reduction of measurement time, and did not improve by including nonlinear terms. Most of these methods improved the overall accuracy only to a limited extent, suggesting that the maximal accuracy is approached given the treadmill's inherent mechanical limitations. However, both correction for position dependence of the accuracy as well as its optimization within the walking area are found to be valuable additions to the standard calibration process.

Original languageEnglish
Pages (from-to)785-792
Number of pages8
JournalMedical Engineering and Physics
Issue number8
Publication statusPublished - Aug 2016


  • Biomechanics
  • Center of pressure
  • Gait analysis
  • Kinematics
  • Kinetics

VU Research Profile

  • Human Health and Life Sciences


Dive into the research topics of 'Optimal calibration of instrumented treadmills using an instrumented pole'. Together they form a unique fingerprint.

Cite this