PaperArm and trunk posture during work in relation to shoulder and neck pain and trapezius activity
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Cited by (24)
The ability of limited exposure sampling to detect effects of interventions that reduce the occurrence of pronounced trunk inclination
2010, Applied ErgonomicsCitation Excerpt :In research, ten or fewer work cycles have been used to characterize posture profiles in many studies of “repetitive” work, both for epidemiologic purposes (e.g., Harber et al., 1992; Marras et al., 1993; Ohlsson et al., 1995; Fallentin et al., 2001) and in ergonomics intervention evaluation (e.g., Häkkänen et al., 1997; Björing and Hägg, 2000). In less routinized jobs, posture recording periods of less than one hour are common, both in observation-based studies (Burdorf, 1992; Burdorf et al., 1997; Rolander et al., 2005; van der Beek et al., 2005), and when technical measurement equipment has been used (e.g., Bao et al., 1996; Vasseljen and Westgaard, 1997; Juul-Kristensen et al., 2001; Balogh et al., 2006). The intervention scenarios selected for this study were intended to represent a set of feasible interventions of varying effectiveness, ranging from fairly modest – a 10% reduction in exposure for the upper 1/8 of the exposure distribution, causing the occurrence of pronounced trunk inclination in the job to decrease by about 0.5 %time, cf. Table 1 – to substantial: a 50% reduction in exposure for the upper 1/2 of the exposure distribution, leading to 6.5–10.9 percent of the job changing from being performed with a trunk inclination larger than 20° to being performed at less than 20°.
Validation of tri-axial accelerometer for the calculation of elevation angles
2009, International Journal of Industrial ErgonomicsCitation Excerpt :An inclinometer is a transducer that measures the elevation/inclination angle relative to gravity. Different types of transducers have been developed and are used to measure elevation angle exposure such as the abduflex (Fernstrom and Ericson, 1996; Svendsen et al., 2005) consisting of mercury microswitches, Intometer (Sporrong et al., 1999) consisting of pressure transducers and distilled water, Physiometer (Vasseljen and Westgaard, 1997) consisting of electrolytic liquid level sensors, and linear accelerometers (Bernmark and Wiktorin, 2002; Estill et al., 2000; Hansson et al., 2006, 2001a; Moller et al., 2004; Mathiassen et al., 2003). Linear accelerometers are commercially available and are commonly used in evaluation of segments' posture by means of uni-axial (Paquet et al., 2001), bi-axial (Boonstra et al., 2006) and tri-axial (Hansson et al., 2001b) accelerometers.
Neck postures in air traffic controllers with and without neck/shoulder disorders
2008, Applied ErgonomicsCitation Excerpt :Work-related musculoskeletal disorders (WRMSD) in neck and shoulders are frequently reported among computer operators (Gerr et al., 2002; Brandt et al., 2004). Several studies of clinical effects of disorders, or their mechanisms, have focused on the issue whether subjects with WRMSD show other patterns in motor performance, in terms of postures, movements and muscular load, than healthy subjects (Hägg and Åström, 1997; Vasseljen and Westgaard, 1997; Madeleine et al., 1999, 2003; Szeto et al., 2002). These studies have shown conflicting results: Vasseljen and Westgaard (1995) found consistent associations between pain and increased activity in the trapezius muscles among manual workers, but not in office workers.
Ergonomic analysis of postural and muscular loads to diagnostic sonographers
2007, International Journal of Industrial ErgonomicsStructural stability and reliability of the Swedish occupational fatigue inventory among Chinese VDT workers
2004, Applied ErgonomicsCitation Excerpt :Ahsberg et al. further asserted that the three subscales were accounted for because of the maintenance of a high state of vigilance and prolonged sitting in a static posture. Besides the intensive cortical activation and hormonal stress which results in general tiredness and declined motivation (Kandel et al., 2000), the long period of static posture and keyboard operation triggered musculoskeletal discomfort such as numbness, muscle soreness, and joint stiffness (Siu et al., 1999; Vasseljen and Westgaard, 1997; Westgaard and Aaras, 1984). Likewise, workers who use a VDT for 4 h or more per day are potentially more vulnerable to occupational fatigue.