Investigation of Joint Reaction Forces and Moments During the Countermovement and Squat Jump

Year 2017, Volume: 8 Issue: 3, 58 - 71, 15.09.2017

Ahmet Alptekin , Serdar Arıtan , Erbil Harbili

Abstract

The purpose of the study is to determine the force and the moments
(torques) using the inverse dynamic modelling acting on the joints during
countermovement (CMJ) and squat jump (SJ) by using link segment modelling. An
elite male volleyball player participated in this study (Height = 1.85 m, Weight = 80 kg). One high-speed
cameras operating at 500 frames per second were used to record the player’s
countermovement and squat jumping (Basler A 602f high speed camera).
Captured views were digitized in the SIMI Motion 7.3 (SIMI Reality Motion
Systems GmbH-Germany) by tracking 9 anthropometrical markers. Displacement data
were filtered with 4^th order 8Hz low pass Butterworth filter.
Segment’s centre of gravity was computed linear velocity and
accelerations.  Angles were calculated
and it used to compute angular velocity and accelerations. Joint reaction
forces and moments were computed by applying the inverse dynamic analysis into
the calculated kinematic values. As result; the height of jump was higher in
CMJ than SJ whereas resultant ground reaction force (GRF) was slightly higher
in SJ compared to CMJ (SJ: 1749.8 N, CMJ: 1710.3 N). Furthermore, there were
two different GRF peaks during CMJ and SJ. These peaks were occurred due to the
backward movement of trunk, upper arm, lower arm and head during from descent
to ascent. Meanwhile shank and thigh were moving the downward. In other words,
it was observed a preparation phase between the descent phase (or stage or
state) and ascent phase both jumps (at CMJ and SJ). Calculated moments in the
CMJ jumping were higher than the SJ.

Keywords

Joint reaction force, Moment (Torque), Inverse dynamic analysis

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