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Figure 1 | Journal of NeuroEngineering and Rehabilitation

Figure 1

From: Novel algorithm for a smartphone-based 6-minute walk test application: algorithm, application development, and evaluation

Figure 1

Forward acceleration with circles identifying foot strikes. (a) Triaxial accelerometer at 100Hz, filtered at 20Hz, with asterisks showing foot strike (modified from Zijstra [24]); (b) Android smartphone accelerometer downsampled to 50Hz (modified from Mellone [15]); (c) Representative data sample from the current study showing similar peaks, highlighted by squares, which would produce incorrect step identification without a locking period. Raw signal is inversed to match convention used by [24] and [15] and asterisks represent foot strike.

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