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Med Sci Sports Exerc. 2009 Apr;41(4):810-7. doi: 10.1249/MSS.0b013e31818ff636.

Reproducibility of a triaxial seismic accelerometer (DynaPort).

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  • 1Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands.



To examine the reproducibility of a triaxial seismic accelerometer under controlled conditions and real-life conditions.


Instrumental reproducibility was examined using a shaker device. The accelerometers (DynaPort MiniMod; McRoberts B.V., The Hague, The Netherlands) were shaken at four frequencies (0.8, 2.1, 3.6, and 4.6 Hz) in x- and y-directions. The magnitude of acceleration ranged from 0 to 1.277g. Additionally, reproducibility under real-life conditions was examined in 55 adolescents (12-17 yr), with the accelerometer attached to the lower back. Each subject walked four short walking trials on level ground at preferred speed. To make this setting meet real-life conditions, we detached and reattached the accelerometer between trials 2 and 3. Detachment of accelerometer between trials 2 and 3 was done by either the same researcher or different researchers (four in total). Intra- and interobserver reproducibility were calculated.


Intra- and interinstrumental intraclass correlation coefficients (ICC) were 0.99 for both x- and y-directions. The intrainstrumental coefficients of variance (CoV) were lower than 1.13%. The interinstrumental CoV were lower than 1.37%. Intraobserver ICC was 0.97, and interobserver ICC was 0.88.


The reproducibility of the accelerometer is high under the controlled conditions of a shaker device and in walking at preferred speed.

[PubMed - indexed for MEDLINE]
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