IEEE J Biomed Health Inform - A novel approach for toe off estimation during locomotion and transitions on ramps and level ground.

Tópicos

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Resumo

Identification of the toe off event is critical in many gait applications. Accelerometer threshold based algorithms lack adaptability and have not been tested for transitions between locomotion states. We describe a new approach for toe off identification using one accelerometer in over ground and ramp walking, including transitions. The method uses invariant foot acceleration features in the segment of gait where toe off is probable. Wavelet analysis of foot acceleration is used to derive a unique feature in a particular frequency band, yielding estimated toe off occurrence. We tested the new method for five conditions: over ground walking (W), ramp ascending (RA), ramp descending (RD); transitions between states (W-RA, W-RD). Mean absolute estimation error was 17.4 ? 12.5, 13.8 ? 8.5 and 22.0 ? 16.4 ms for steady states W, RA and RD, 20.1 ? 15.5 and 17.1 ? 13.7 ms for transitions W-RA and W-RD, respectively. Algorithm performance was equivalent across all pairs of transition and locomotion state except between RA and RD (p = 0.03), demonstrating adaptability. The db1 wavelet outperformed db2 across states and transitions (p < 0.01). The presented algorithm is a simple, robust approach for toe off detection.

Resumo Limpo

identif toe event critic mani gait applic acceleromet threshold base algorithm lack adapt test transit locomot state describ new approach toe identif use one acceleromet ground ramp walk includ transit method use invari foot acceler featur segment gait toe probabl wavelet analysi foot acceler use deriv uniqu featur particular frequenc band yield estim toe occurr test new method five condit ground walk w ramp ascend ra ramp descend rd transit state wra wrd mean absolut estim error ms steadi state w ra rd ms transit wra wrd respect algorithm perform equival across pair transit locomot state except ra rd p demonstr adapt db wavelet outperform db across state transit p present algorithm simpl robust approach toe detect

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