AN APPLICATION OF PASSIVE EXOSKELETON OF THE LUMBAR REGION IN MANUAL ACTIVITIES

In work environments with low levels of automation, the repetitive execution of manual tasks imposes high physical demands on workers, generating both immediate and cumulative occupational health risks. The use of wearable technologies, such as passive exoskeletons, stands out as a promising alternative for the prevention of occupational diseases. In this context, the objective of this study was to develop a passive lumbar exoskeleton to reduce physical effort and compare its effects during repetitive manual tasks involving trunk flexion. This is an experimental study with a quantitative approach. The exoskeleton, designed and 3D printed with movable parts, uses an elastic system to assist in performing and returning from flexion movements. The experiment was conducted with eight volunteers who performed two standardized manual tasks, with and without the use of the device. Heart rate and blood oxygen saturation were monitored and recorded during the tests. Statistical analysis was performed using Pearson's Correlation Test, with a significance level of 5%. The results showed reductions in heart rate in both tasks: from 102.5 to 98.25 bpm (Activity I) and from 99.25 to 96 bpm (Activity II), with blood oxygen saturation maintained within safe levels, suggesting lower physical effort when using the exoskeleton. It is concluded that the developed device shows potential for application in occupational settings, contributing to reduced physical strain and improved ergonomics.