Apparatus for grip force measurement

The digital handgrip strength dynamometers (T.K.K.5710b model; Takei Scientific Instruments Co. Ltd., Niigata, Japan) were used to measure the right and left hands grip forces. These dynamometers were connected to strain amplifiers (T.K.K.1268 model; Takei Scientific Instruments Co. Ltd., Niigata, Japan). The measuring range of the dynamometers and strain gauge is 0–100 kg, and the measurement error is ± 0.2% FS or less. The strain amplifiers were connected to a Power-Lab 16sp analog to digital converter (AD Instruments Pty. Ltd., Bella Vista, Australia), and the grip force signals were recorded with a laptop computer using Chart8.1.13 software via a Power-Lab with a 1-kHz sampling rate. The force signals were submitted to a low-pass filter with a cut-off frequency of 50 Hz, and the data was analyzed using Chart8.1.13 software. The force signals of right- and left-hand were displayed on a 46-inch digital screen (LCD-V463-N2; NEC, Tokyo, Japan) in front of the participant.

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