Fig. 9.
The relationship between a change (ΔRMS) in the RMS index from test 1 to test 4 (ΔRMS = RMS4 − RMS1) and a change (ΔΔVz) in the index of multi-finger synergy (ΔΔVz = ΔVz4 − ΔVz1) with a linear regression line and equation.
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