Quantifying work load in neck, shoulders and wrists in female dentists

Åkesson, Ingrid; Hansson, Gert–Åke; Balogh, I; Moritz, Ulrich; Skerfving, Staffan

doi:10.1007/s004200050175

Cited by 157 publications

(94 citation statements)

References 30 publications

(40 reference statements)

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“…High EMG variations have also been reported in earlier, though smaller and less well-standardized studies (20,27,28,17). One possible explanation for the large variation is methodological.…”

Section: Discussionmentioning

confidence: 61%

“…When we tested a series of possible causes, neck-shoulder disorders did not have any significant impact on the variance; this result indicates that muscular load does not change when the disorder appears. In contrast, such an effect has been observed in dentists (20), probably due to their possibilities to adapt their work. As for stress tendency, the lack of consistent associations is also in contrast to the findings of other studies (31).…”

Section: Discussionmentioning

confidence: 84%

“…The subjects performed sitting push-ups from a chair to ensure that cross-talk from, for example, the trapezius ascendens was not present. A telemetric system, an analogue tape recorder, an analogue-digital converter, and an IBM compatible personal computer were used for the recording and analysis; for details on the electrodes, equipment and signal processing, see the article by Akesson et a1 (20).…”

Section: Electromyographymentioning

confidence: 99%

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Interindividual variation of physical load in a work task

Balogh¹,

Hansson²,

Ohlsson³

et al. 1999

Scand J Work Environ Health

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 84%

Section: Electromyographymentioning

confidence: 99%

See 1 more Smart Citation

Interindividual variation of physical load in a work task

Balogh¹,

Hansson²,

Ohlsson³

et al. 1999

Scand J Work Environ Health

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“…The MVICs of the extensor muscles, the biceps brachii, and the trapezius were registered using the procedure described by Akesson et al 21 and Freriks and Hermens 19 . The examiner provided verbal feedback while recording the MVICs.…”

Section: Record Of Muscle Electrical Activity Of Upper Limbsmentioning

confidence: 99%

30o inclination in handles of plastic boxes can reduce postural and muscular workload during handling

Silva

Oliveira

Silva

et al. 2013

Braz. J. Phys. Ther.

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| Background: The handling of materials, which occurs in the industrial sector, is associated with lesions on the lumbar spine and in the upper limbs. Inserting handles in industrial boxes is a way to reduce work-related risks. Although the position and angle of the handles are significant factors in comfort and safety during handling, these factors have rarely been studied objectively. Objective: To compare the handling of a commercial box and prototypes with handles and to evaluate the effects on upper limb posture, muscle electrical activity, and perceived acceptability using different grips while handling materials from different heights. Method: Thirty-seven healthy volunteers evaluated the handles of prototypes that allowed for changes in position (top and bottom) and angle (0°, 15°, and 30°). Wrist, elbow, and shoulder movements were evaluated using electrogoniometry and inclinometry. The muscle electrical activity in the wrist extensors, biceps brachii, and the upper portion of the trapezius was measured using a portable electromyographer. The recorded data on muscle movements and electrical activity were synchronized. Subjective evaluations of acceptability were evaluated using a visual analog scale. Results and Conclusions: The prototypes with handles at a 30° angle produced the highest acceptability ratings, more neutral wrist positions, lower levels of electromyographic activity for the upper trapezius, and lower elevation angles for the arms. The different measurement methods were complementary in evaluating the upper limbs during handling.Keywords: ergonomic design; usability; electrogoniometry; electromyography; grip perception. HOW TO CITE THIS ARTICLESilva LCCB, Oliveira AB, Silva DC, Paschoarelli LC, Coury HJCG. 30° inclination in handles of plastic boxes can reduce postural and muscular workload during handling. Braz J Phys Ther. 2013 May-June; 17(3):307-318. http://dx

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“…For the upper arms, the inclinometer was fixed to a plastic plate (55×27 mm), which was placed along the upper arm, with the lateral edge along a line from the lateral-posterior corner of the acromion to the lateral epicondyle, and the upper edge at the insertion of the deltoid muscle. For the head and upper back, the forward/backward and sideways projections of the inclination angles (flexion/extension and lateral flexion below) and the absolute value of their time derivatives (v i =| (a i+1 -a i-1 )×0.5×f |; v i = absolute velocity for sample number i, a i+1 = angle value for sample number i+1, a i-1 = angle value for sample number i-1, f= sampling frequency) were used to describe postures and movements [2,12]. The forward/backward and sideways bending of the neck was, for each sample, calculated as the differences between the corresponding measures for the head and the upper back; the time derivatives of these differences were also calculated, using the same algorithm as for the head and the upper back.…”

Section: Inclinometry -7 -mentioning

confidence: 99%