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Hand-Transmitted Vibration
Published in Neil J. Mansfield, Human Response to Vibration, 2004
Occasionally, tendons or their synovial sheaths can become inflamed causing tendonitis or tenosynovitis, respectively. Conditions such as lateral epicondylitis (“tennis elbow”) or medial epicondylitis (“golfer’s elbow”) are common forms of tendonitis observed with users of tools. Similarly, tool users commonly exhibit painful swelling of the extensor tendon sheaths of the thumb (de Quervain’s disease) or the flexor tendons of the finger (“trigger finger”). As for other elements of HAVS, these conditions are unlikely to be directly caused by vibration but by other ergo-nomic factors (e.g., posture, manual handling) associated with the job.
Interaction between physical demands and job strain on musculoskeletal symptoms and work performance
Published in Ergonomics, 2023
Suyoung Kwon, Soo-Jeong Lee, Stephen Bao, A. B. de Castro, Jerald R. Herting, Kurt Johnson
Demographic characteristics at each time point are presented in Table 1. Over the course of two years, 713 participants with 1450 observations (n = 669 at baseline, n = 428 one year later, n = 353 two years later) were included in this present study. At baseline, the participants were 50% male, 60% white, 48% high school graduate, 57% reporting high co-worker support, and 68% reporting high job security. Of the participants, 9% had comorbidities, such as thyroid disease, diabetes mellitus, and rheumatoid arthritis, and 21% had a previous diagnosis of MSDs in upper extremities at baseline, such as carpal tunnel syndrome, thoracic outlet syndrome, hand/wrist tendinitis, epicondylitis, trigger finger, and rotator cuff syndrome. Regarding the SI, participants were equally distributed across the three different physical job risk categories, but slightly more participants were grouped in the hazardous group based on the TLV for HA. The means of MSUE and limited work performance were 8.17 (SD: 15.24, range: 0–77.27), and 11.67 (SD: 14.87, range: 0–100), respectively. Similar characteristics were observed in participants during the follow-up waves, except for age and job strain. Age at baseline showed an increase from 39.4 years (SD: 10.8) at baseline to 41.2 years (SD: 10.2) two years later (p < .02). On the other hand, job strain showed a significant decrease from 1.08 (SD: 0.27) at the baseline to 1.03 (SD: 0.23) at the last follow-up visit (p = .003).
Electromyographic evaluation of different handle shapes of masons’ trowels
Published in International Journal of Occupational Safety and Ergonomics, 2021
Nabiollah Bakhtiari, Iman Dianat, Moein Nedaei
The human hand is an end effector of the multilink kinematic chain of the body, and thus a change in position of any of the proximal segments may have an influence on the force produced by the hand and fingers [1]. In many daily and occupational activities, frequent use of the hands may lead to numerous musculoskeletal disorders (MSDs) and injuries (e.g., de Quervain’s tenosynovitis, trigger finger, ganglionic cysts, hand-arm vibration syndrome, BlackBerry thumb) [2–4]. Hand disorders account for approximately 33% of all work injuries, 25% of lost work time and 20% of permanent disabilities [3,5].
Assessing the impact of critical risk factors on the development of musculoskeletal disorders: a structural equation modelling approach
Published in Theoretical Issues in Ergonomics Science, 2023
S. Talapatra, M. S. Parvez, P. Saha, M.G. Kibria
The musculoskeletal system can be defined as the collection of arrangements of different parts like bones, joints, muscles, tendons, ligaments, nerves, soft tissues, blood vessels, and spine, etc. (Bispo et al. 2022). Together, they support the human body’s weight, maintain posture and help the movement of humans. A disorder refers to a disturbance of function, structure, or both resulting from a genetic or embryonic failure in development or exogenous factors such as poison, trauma, or disease (Altyar et al. 2023). Therefore, MSDs can be expressed as the collection of injuries or disorders that affect the human musculoskeletal system (Bairwa et al. 2022). Common musculoskeletal disorders include Carpal Tunnel Syndrome, Tendonitis, Muscle/Tendon strain, Ligament Sprain, Tension Neck Syndrome, Thoracic Outlet Compression, Rotator Cuff Tendonitis, Epicondylitis, Radial Tunnel Syndrome, Digital Neuritis, Trigger Finger/Thumb, DeQuervain’s Syndrome, Mechanical Back Syndrome, Degenerative Disc Disease, Ruptured/Herniated Disc, and many more (Bayzid et al. 2019). Other common names for MSDs are ‘repetitive motion injury’, ‘repetitive stress injury’, ‘overuse injury’, and many more (Das, Krishna, and Shanmugaraja 2023). Lifting heavy weights, repetitive force, vibration, and incorrect posture cause musculoskeletal wear and strain (Mondal and Ghosh 2022). Wear and strain on the musculoskeletal system can lead to pains, damages or injuries in the musculoskeletal system, often known as MSD problems. Problems associated with MSD do not suddenly develop; instead, they develop gradually and display several symptoms. Workers exposed to conditions that increase their risks of MSD problems may experience fatigue. Musculoskeletal imbalances happen when a person is too fatigued and his body can’t recover fast enough. Musculoskeletal disorders emerge with time when fatigue continues to outpace recovery, and the musculoskeletal imbalance remains untreated. If the treatment is not initiated correctly, various acute musculoskeletal illnesses may develop within the body (Talapatra et al. 2022).