Electromyography Activity of the Vastus Intermedius and Gastrocnemius during squatting and walking experiments

These data present the average EMG RMS from the Vastus Intermedius and Gastrocnemius muscles of the right leg of five subjects in a repetitive squatting/lifting and walking/carrying experiments. The box of load lifted or carried weighs 4.3kg. Starting from the raw EMG data, linear envelopes have been computed by full-wave rectification of the EMG signals and low-pass filtered by a third order Butterworth filter with cut-off frequency at 512Hz. The EMG signals are further divided into traces for each task. Lifting/squatting task is divided per squatting cycle (i.e. squat-decent and ascent) and carrying/walking task is divided per stride (i.e. heel-off to heel strike). Information from the insole ground reaction force sensor was applied to define proper intervals between traces. For each subject, the root mean square (RMS) of the EMG signals is then averaged per trial in both squatting and walking experiments.