Abstract:
Objectives: Nowadays, Snap-fits are used in the automotive industry as a proper alternative for mechanical joints, cabling joints, and car interior lining joints. Due to the special form of these joints, which are assembled manually, the contact area between Snap-fits and the worker’s fingertips can be too small. This can cause skin pain on the worker’s fingertips. Therefore, an ergonomic study of these assembly operations can be useful for the automotive industries. This study was thus undertaken to investigate the severity of mechanical stress on fingertips.Methods: In the first stage, the FEM-Method is used to analyse the influence of some effective factors including gender, age, the thickness of the epidermis of a skilled worker, wearing gloves, amount of force, force angle, and snap-fit material parameters during snap-fit assembly. For this purpose, four thumb models, 50% male and 50% female from 20-29 and from 50-59 years old, are used.Results: The mechanical stress is directly associated with gender, age, thickness of epidermis, and the amount of force, and inversely associated with wearing gloves, and force angle.Discussion: The maximum compressive stress and the greater deformation of skin in the male group as compared to the female group is due to the smaller size of women’s thumbs and a less thick outer layer of women’s skin. Moreover, for old people, a higher elastic modulus leads to a greater stiffness of their skin. Finally, the young people’s modulus does not have a significant effect on the maximum compressive stress and total deformation of the skin.
Machine summary:
However, the purpose of this study is to determine whether measuring the effects of therapeutic interventions on fatigue control in MS patients may be possible using a validated questionnaire in a local language.
The mean and standard deviation differences of Fatigue Impact Scale (FIS) scores of patients with multiple sclerosis and healthy adults Subscales Patients w M ith MS SD Health M y adults SD p-value Physical 18.
Spearman’s correlation coefficient of the Persian version of the FIS with the SF-36 and FSS (convergent validity) FIS scales subscales Physical Cognitive Social Total r r r r Phys F -0.
In addition, there seems to be a possibility for validating the use of the modified version of this questionnaire as the Persian version of the Daily Fatigue Impact Scale (D-FIS).
Validation of the Fatigue Impact Scale in Hungarian patients with multiple sclerosis.
Validity and reliability of Persian version of Modified Fatigue Impact Scale (MFIS) questionnaire in Iranian patients with multiple sclerosis.
Psychometric study of Turkish version of Fatigue Impact Scale in multiple sclerosis patients.
Fatigue Severity Scale: The Psychometric Properties of the Persian-Version in Patients with Multiple Sclerosis.
Test–retest reliability and convergent validity of the Fatigue Impact Scale for persons with multiple sclerosis.
Quality of life in patients with multiple sclerosis: the impact of fatigue and depression.
Validity of a French version of the fatigue impact scale in multiple sclerosis.