Data analysis
To process IMU data, the 0.2-second moving average was performed to smooth linear acceleration respecting to the X, Y, and Z axes (aRaw EMG signals were collected with a sampling frequency of 1200 Hz and band-pass filtered (20–450 Hz). To convert the raw EMG signals to Root Mean Square (RMS), the signals were corrected for DC offset, rectified, and low-pass filtered with a Butterworth (2The HRV data were analyzed by performing the medium artefact correction with 5% acceptance threshold and 500-lamba smoothness priors via the Kubios HRV standard software (Kubios Oy, Finland). For the ratio of low frequency and high frequency (LF/HF), the spectrum estimation was obtained by the Welch’s periodogram method.