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