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- Gustafsson, Ewa, 1955, et al.
(författare)
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Technique, muscle activity and kinematic differences in young adults texting on mobile phones
- 2011
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Ingår i: Ergonomics. - : Informa UK Limited. - 1366-5847 .- 0014-0139. ; 54:5, s. 477-87
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to investigate whether there are differences in technique between young adults with and without musculoskeletal symptoms when using a mobile phone for texting and whether there are differences in muscle activity and kinematics between different texting techniques. A total of 56 young adults performed a standardised texting task on a mobile phone. Their texting techniques were registered using an observation protocol. The muscular activity in six muscles in the right forearm/hand and both shoulders were registered by surface electromyography and the thumb abduction/adduction and flexion/extension were registered using a biaxial electrogoniometer. Differences in texting techniques were found between the symptomatic and the asymptomatic group, with a higher proportion of sitting with back support and forearm support and with a neutral head position in the asymptomatic group. Differences in muscle activity and kinematics were also found between different texting techniques. The differences in texting technique between symptomatic and asymptomatic subjects cannot be explained by them having symptoms but may be a possible contribution to their symptoms. Statement of Relevance: There has been a dramatically increased use of mobile phones for texting especially among young people during the last years. A better understanding of the physical exposure associated with the intensive use is important in order to prevent the development of musculoskeletal disorders and decreased work ability related to this use.
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| 2. |
- Gustafsson, Ewa, 1955
(författare)
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Ergonomic recommendations when texting on mobile phones
- 2012
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Ingår i: Work-a Journal of Prevention Assessment & Rehabilitation. - : IOS Press. - 1051-9815. ; 41:Supplement 1, s. 5705-5706
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this report was to give ergonomic recommendations in order to prevent musculoskeletal symptoms/disorders among young people due to intensive texting on mobile phones. In a study of 56 Swedish young adults (19-25 years, 41 with musculoskeletal symptoms in neck and/or upper extremities and 15 without symptoms) registration of thumb movements with electrogoniometry, muscle activity with electromyography and observation of texting technique were conducted during texting on mobile phones. The results showed differences in physical load between the group with musculoskeletal symptoms and the group without symptoms. There were also found differences in muscle activity and kinematics between different texting techniques. These differences could not be explained by the asymptomatic group having symptoms but may be a possible contribution to their symptoms. According to these results it can be recommended to support the forearms, to use both thumbs, to avoid sitting with the head bent forward and to avoid texting with high velocity in order to prevent musculoskeletal disorders when using mobile phones for texting.
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| 3. |
- Gustafsson, Ewa, 1955, et al.
(författare)
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Thumb postures and physical loads during mobile phone use - A comparison of young adults with and without musculoskeletal symptoms.
- 2010
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Ingår i: Journal of electromyography and kinesiology. - : Elsevier BV. - 1050-6411. ; 20:1, s. 127-135
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate thumb postures, thumb movements and muscle activity when using mobile phones for SMS messaging and to determine whether there were differences in these exposures (a) across various mobile phone tasks, (b) between gender and (c) between subjects with and without musculoskeletal symptoms in shoulders and upper extremities. Fifty-six young adults (15 healthy and 41 with musculoskeletal symptoms) performed a series of distinct tasks on a mobile phone. Muscular load in four forearm/hand muscles in the right arm and the right and left trapezius muscles were measured using electromyography (EMG). Thumb movements were registered using an electrogoniometer. The results showed that postures (sitting or standing) and the type of mobile phone task (holding the phone versus texting) affected muscle activity and thumb positions. Females compared to males had higher muscle activity in the extensor digitorum and the abductor pollicis longus when entering SMS messages and tended to have greater thumb abduction, higher thumb movement velocities and fewer pauses in the thumb movements. Subjects with symptoms had lower muscle activity levels in the abductor pollicis longus and tended to have higher thumb movement velocities and fewer pauses in the thumb movements compared to those without symptoms.
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