Obesity Effects on Posture Strategy and Stability Performance during a Weight Lifting Task
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Maintaining a stable posture during lifting tasks is important since falling is one of the major issues for workplace safety. Previous studies have indicated that obesity is generally associated with greater balance instability in quiet standing. For individuals who are obese, performing lifting tasks with larger body masses presents additional concerns for physical stress and stability. The aim of current study was to examine the impact of obesity on postural control and balance during a box lifting task. Fourteen young male adults participated in this study, categorized into two groups obese and non-obese. Participants completed one-hour of lifting at frequency of four lifts per minute. A two-dimensional vision-based motion analysis and a force plate system were used to capture kinematics and kinetics of lifting. A higher postural sway was shown in the anterior-posterior direction for the non-obese group compared to the obese group. In addition, the findings displays indicate that the non-obese group tended to use a more "squat" strategy when they performed lifting. Interventions which can reduce negative biomechanical effects and improve stability for individuals who are obese must be taken in consideration to minimize the risk of workplace injury.