Intrinsic ankle stiffness during standing increases with ankle torque and passive stretch of the Achilles tendon _ Study 1 dataset

Dataset used for study 1 (ankle torque). pXX__normal / vertical / lean = trials recorded with perturbations to measure stiffnesspXX__topplingtorque = trials recorded for toppling torque per unit angle estimation, in which participants were swaying backwards/forwards very gentlypXX_standing_normal / vertical / lean = trials recorded without perturbations, in which participants were standing quietly at preferred forward leaning positionData recordings are distributed as: pos=calibrate(Dataset(:,2),potCF); % footplate angular rotationLTq=calibrate(Dataset(:,4),ltqCF); % left torqueacc=Dataset(:,3); acc=calibrate(acc,accCF); % accelerationlaser1=calibrate(Dataset(:,6),laser1CF); shinpos=atan(laser1./laserH1); % calculate angular rotation with atan of tan=linear displacement/laser height anklepos=pos+shinpos; % ankle angular rotationlaser2=calibrate(Dataset(:,7),laser2CF); boardpos=atan(laser2./laserH2); bodypos=pos+boardpos; % body angular rotation EMG1=abs(Dataset(:,8)); % channel 7 EMG1 (left tibialis anterior)EMG2=abs(Dataset(:,9)); % channel 8 EMG2 (left medial gastrocnemius)EMG3=abs(Dataset(:,10)); % channel 9 EMG3 (right tibialis anterior)EMG4=abs(Dataset(:,11)); % channel 10 EMG4 (right medial gastrocnemius)Calibration: Motor: 0,6 Potentiometer (rad): 0,0253 Potentiometer (deg): 1,45 Left load cell: -9,88 Right load cell: -20,6 Accelerometer: -127,681 Laser #1: 0,01 Laser #2: 0,02