Effect of Lifting Weight, Height and Asymmetry on Biomechanical Loading during Manual Lifting

Introduction: In India, physical manual activities in asymmetrical postures overtax the human musculoskeletal system, which may exceed workers' limitations. Thus purpose of this study was to examine stresses experienced by subject, based on subjective and biomechanical loading estimates while lifting weights various heights, an asymmetric direction propose safe limit for lifting. Methods: A laboratory experiment conducted utilizing twelve male subjects age group 20 25 years who lifted 5 different between 10 kg from below knee heights (below ear level). The task performed three angles (45, 90, 135-degree) using free-style techniques. An ANOVA technique used analyze influence parameters (Lifting weight, height angle) two responses; loading. estimate obtained workload assessment body discomfort chart. (loading rate) estimated ground reaction force data, plate. Results: Both followed a consistent pattern predicting stress. result revealed that with higher destination asymmetry increased physiological discomfort. Experiments have shown rate is reduced 8 10% each increase 45-degree angle asymmetry. Conclusion: general, 15 weight up level shoulder are recommended 45- 90-degree respectively prevent any chronic injuries. maximum 12.5 also proposed.