gait events

[Maryam Hajizadeh]

Dear all,

Does anyone know whether the method suggested by

'O’Connor, Ciara M., Susannah K. Thorpe, Mark J. O’Malley, and Christopher L. Vaughan. "Automatic detection of gait events using kinematic data." Gait & Posture 25, no. 3 (2007): 469-474.'

for detecting gait events is also valid for gait events during stair ascent/ stair descent. the foot center velocity figure is different from one presented in this paper especially during stair descent.

Does anyone know which solution could work better for detecting events using kinematic data during stair ascent/ stair descent?


Thanks in Advance.
Maryam Hajizadeh

[John G Buckley]

Re: gait events

I suggest you look at:
Foster RJ, De Asha AR, Reeves ND, Maganaris C, and Buckley JG. (2014) Stair-specific algorithms for identification of touch-down and foot-off when descending or ascending a non-instrumented staircase. Gait Posture; 39: 816-821.

John Buckley

[Dustin Bruening]

Re: gait events

I recently did a comparison of event algorithms in pathological gait. The study didn't address stairs, but there were some very good insights into the robustness of the algorithms that might be helpful for your application. The algorithm you cite was included in the comparison. Reference is:
Bruening DA and Ridge ST. "Automated event detection algorithms in pathological gait." Gait & posture 39.1 (2014): 472-477.

-Dustin Bruening

[Maryam Hajizadeh]

Re: gait events

I suggest you look at:
Foster RJ, De Asha AR, Reeves ND, Maganaris C, and Buckley JG. (2014) Stair-specific algorithms for identification of touch-down and foot-off when descending or ascending a non-instrumented staircase. Gait Posture; 39: 816-821.

John Buckley

Dear John Buckley,
Thanks a lot for your reply.

Just 2 questions:
(1) when full body marker set is not used and center of mass can not be calculated for detecting stair descent gait event, what other parameter can be used? Is is possible to replace the center of mass with pelvis marker?

(2) For determining the window size, if markers were not placed on the corners of staircase, which other parameter can be replaced?

Thanks.
Maryam

[John G Buckley]

Re: gait events

[Dear Maryam,

responses to your 2 questions:

1. We are not sure if using the centre of the pelvis would work with the proposed algorithms. Previous work (Vanrenterghem et al., 2010) has shown that CoM of the lower limbs and pelvis combined provides a better representation of the whole body CoM than using a single upper body marker. However, the movement they analysed was very different to stair negotiation.

2. We didn't investigate this so cannot directly answer your questions. Bare in mind that without a search window, it becomes difficult to determine on which stair of a staircase the events are taking place. Thus without knowing where each step is in the coordinate system you would need to be creative.

hope this helps
John]