Effect of Workers’ Weight on Work Efficiency

Abstract

The primary objective of the human factor is to optimize performance and ensure safety through physical work while mitigating the risk of musculoskeletal complaints and reducing energy expenditure. Lately, concerns have been raised that body capacities may not only contribute to an increased risk of musculoskeletal disorders but also to increased energy which leads to a decrease in work efficiency. Therefore, this study aimed to explore the impact of body weight on work efficiency, specifically in terms of activity energy expenditure (AEE). AEE amounts were conducted using the Actiheart device while subjects performed 12 coordinated trunks, shoulder, and leg postures during a drilling task. Statistical analyses, including independent samples t-test and mean differences, were employed to examine the effects of subject weight on AEE. The findings revealed a negative correlation between AEE and subject weight (free fat), with an R-squared value of 0.62. This indicates that as subject weight increases, AEE decreases. Interestingly, individuals with higher body weight (free fat) expended less AEE, suggesting a potentially more efficient use of energy during the task.