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Seiichiro Takei, Kuniaki Hirayama and Junichi Okada

previously described. 6 – 10 , 15 Briefly, (1) the subjects stood still on a force platform while holding the bar at their upper thigh, (2) moved the bar down to the upper part of their knees, (3) pulled the bar drastically upward with countermovement, and (4) then lowered themselves into a quarter

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Yuko Kuramatsu, Yuji Yamamoto and Shin-Ichi Izumi

flexed at approximately 100°. The position of the buttocks on the seat and the position of each foot on the force platform were marked with tape, and prior to each trial, each participant’s starting position was adjusted to be in alignment with these marks. Participants were instructed to hang their arms

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Michael Wälchli, Jan Ruffieux,, Audrey Mouthon, Martin Keller and Wolfgang Taube

for participants of the CON groups. Balance Tests on the Force Plate Center of pressure (COP) measurements on the force plate (508 × 464 mm; OR6-7 Force Platform; Advanced Mechanical Technology Inc, Watertown, MA), which have previously been shown to be reliable in analyzing balancing abilities ( 24

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John D. McCamley, Eric L. Cutler, Kendra K. Schmid, Shane R. Wurdeman, Jason M. Johanning, Iraklis I. Pipinos and Sara A. Myers

modified Helen Hayes marker set arrangement. 26 Lower extremity kinetics were collected, at a rate of 600 Hz, using a Kistler piezoelectric force platform (Kistler North America, Amherst, NY) mounted flush with the surface of the floor. Lower extremity kinematics were collected at a rate of 60 Hz using a

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Joseph Hamill

collect and analyze kinematic data, but kinetic data were different because few laboratories had force platforms. Professor Roger Enoka of the University of Colorado, in his recent Borelli Lecture at the American Society of Biomechanics meeting, suggested that only about 10 laboratories in the United