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Measurements of vertical displacement in running, a methodological comparison
KTH, School of Technology and Health (STH), Medical Engineering.
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2009 (English)In: Gait & Posture, ISSN 0966-6362, E-ISSN 1879-2219, Vol. 30, no 1, 71-75 p.Article in journal (Refereed) Published
Abstract [en]

The aim was (1) to evaluate measurements of vertical displacements (V-disp) of a single point on sacrum as an estimate of the whole body centre of mass (CoM) V-disp during treadmill running and (2) to compare three methods for measuring this single point. These methods were based on a position transducer(PT), accelerometers (AMs) and an optoelectronic motion capture system. Criterion method was V-disp of the whole body CoM measured with the motion capture system. Thirteen subjects ran at 10, 12, 14, 16. 18, 20 and 22 km h(-1) with synchronous recordings with the three methods. Four measurements of the (V-disp) were derived: (1) V-disp of CoM calculated from a segment model consisting of 13 segments tracked with 36 reflective markets, (2) V-disp of the sacrum recorded with the PT, (3) V-disp of the sacrum Calculated from the AM, and (4) V-disp of the sacrum calculated as the mid point of two reflective markets (sacrum marker, SM) attached at the level of the sacral bone. The systematic discrepancy between the Measurements of sacrum V-disp and CoM V-disp varied between 0 and 1.5 mm and decreased with increasing running velocity and decreasing step duration. PT and SM measurements showed strong correlation, whereas the AM showed a variability increasing with velocity. The random discrepancy within each Subject was 7 mm for all three methods. In conclusion single-point recordings of the sacrum V-disp may be used to monitor changes in V-disp of CoM during treadmill running.

Place, publisher, year, edition, pages
2009. Vol. 30, no 1, 71-75 p.
Keyword [en]
Vertical displacement, Treadmill running, Running economy
National Category
Medical Laboratory and Measurements Technologies Medical and Health Sciences
URN: urn:nbn:se:kth:diva-32355DOI: 10.1016/j.gaitpost.2009.03.001ISI: 000266905000014ScopusID: 2-s2.0-67349105552OAI: diva2:410636
QC 20110414Available from: 2011-04-14 Created: 2011-04-13 Last updated: 2011-04-14Bibliographically approved

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