Analysis of tremor
tremor
For the Bow tremor measurement, the accelerometers were fixed to the handle with taping. To measure arm tremor, the accelerometers were fixed to the lateral epicondyle of the humerus with taping. Bow and arm tremor were measured using accelerometers (OE-WS2521; Oisaka, Hiroshima, Japan) fixed to the handle of the bow by taping. This device is an integrated accelerometer and surface EMG sensor that is also used to measure muscle activity.The accelerometer and EMG data obtained in this study were analyzed using Python (version: 3.10.6, packaged by conda-forge), pandas (version: 1.4.3), numpy (version: 1.22.4), matplotlib (version: 3.5.3), scipy.stats (version: 1.9.0), and scikit_posthocs (version: 0.7.0). The sampling frequency was 1 kHz, the sampling time was 15 seconds, and the obtained acceleration data (If the measurement time is Since the Fast Fourier Transform algorithm to be used later includes butterfly operations, the sample size to be analyzed should satisfy (3) when the natural number is N. The sample size for analysis is smaller than the measured sample size. In other words (4), which must be smaller than the measured sample size (15000). In the case of this study, the maximum value satisfying (3) and (4) is 8192 (= 2The data for the intermediate 8.192 s were converted into frequency data using a fast Fourier transform (FFT) (5, 6); and the power spectrum was calculated. The sum of the values in the 3–18-Hz frequency band was analysed as the tremor value. The programming code used for the analysis is attached in the (