This GIT respository contains all files needed for an adequate analysis of the gait (6MWT) accelerometer data.
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function [dataAcc, dataAcc_filt] = FilterandRealignFunc(inputData,FS,ApplyRealignment)
%% Filter and Realign Accdata
% Apply Realignment & Filter data
if ApplyRealignment % apply relignment as described in Rispens S, Pijnappels M, van Schooten K, Beek PJ, Daffertshofer A, van Die?n JH (2014).
data = inputData(:, [3,2,4]); % reorder data to 1 = V; 2= ML, 3 = AP%
% Consistency of gait characteristics as determined from acceleration data collected at different trunk locations. Gait Posture 2014;40(1):187-92.
[RealignedAcc, ~] = RealignSensorSignalHRAmp(data, FS);
dataAcc = RealignedAcc;
[B,A] = butter(2,20/(FS/2),'low');
dataAcc_filt = filtfilt(B,A,dataAcc);
else % we asume tat data is already reorderd to 1 = V; 2= ML, 3 = AP in an earlier stage;
[B,A] = butter(2,20/(FS/2),'low');
dataAcc = inputData;
dataAcc_filt = filtfilt(B,A,dataAcc);
end