Zainuddin, Fara Liana
(2015)
A biomechanical analysis of the knee joint during
power snatch.
Project Report.
Universiti Sains Malaysia.
(Submitted)
Abstract
This study focuses on the biomechanics of the knee joint which is one of the
most frequently injured joint among weightlifters. Most of the techniques in
snatch event are associated to knee flexion especially during squatting phases.
The purpose of the study was to compare the range of motion (ROM) of the
knee joint and barbell acceleration during one Repetition Maximum (1RM) and
50% of 1RM power snatch, and evaluate the knee joint reaction force (JRF)
during 50% of 1RM power snatch. 25 state-level weightlifters were recruited
voluntarily for the study. Standard 1 RM power snatch test was analyzed using
two-dimensional (2D) kinematic method. Next, the knee joint ROM, barbell
acceleration and knee JRF for 50% of 1RM power snatch were analyzed using
three-dimensional (3D) kinematic method. The demographic result showed that
physical evaluation of the athletes was in fair category. The Paired t-test
showed that there was a significant difference of the knee joint ROM between
50% and 1-RM power snatch. The barbell accelerated faster during acceleration
50% of 1RM power snatch compared to 1RM power snatch (P = 0.044)
particularly during second pull phase. Lastly, descriptive statistics of the knee
joint reaction force (JRF) of weightlifters during 50% of 1RM power snatch that
normalized to the bodyweight were 0.33 ± 0.20 N.m/kg.m for male weightlifters
and 0.75 ± 1.68N.m/kg.m for female weightlifters. Overall, the knee range of
motion and barbell acceleration decreased as the load of the barbell increased.
The knee JRF of weightlifters during 50% of 1RM power snatch was within the
normal range of knee JRF during squatting.
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