| Abstract: | Dynamic mechanical response parameters (stiffness, damping and effective mass), physiological properties (strength and swelling) and symptoms of the upper limb were measured before power tool operation, immediately following and 24?h after power tool operation. Tool factors, including peak torque (3 Nm and 9 Nm) and torque build-up time (50?ms and 250?ms), were controlled in a full factorial design. Twenty-nine inexperienced power hand tool users were randomly assigned to one of four conditions and operated a pistol grip nutrunner four times per min for 1?h in the laboratory. Isometric strength decreased immediately following tool use (15%) (p?p?p?p?
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