EMG Analysis of Selected Hand Muscles in Writing Short Text Messages on the Mobile Phone
Authors:
I. Šimková; D. Pavlů; D. Pánek
Authors‘ workplace:
Katedra fyzioterapie FTVS UK, Praha
vedoucí katedry doc. PaedDr. D. Pavlů, CSc.
Published in:
Rehabil. fyz. Lék., 18, 2011, No. 2, pp. 59-68.
Category:
Original Papers
Overview
In this contribution the authors surveyed actual contemporary theoretical knowledge concerning the problems of „Repetitive Strain Injury“, i.e. the syndrome of repeated overload with special attention to the newly originating term and disorder „Text Message Injury“. Moreover, the authors present a pilot study evaluating, with the use of polyelectromyographic examination, the start of muscular fatigue in selected muscles of the hand in writing short texting on the mobile phone. In five healthy probands the authors evaluated muscular activity in m. opponens pollicis, m. flexor carpi ulnaris and m. extensor carpi radialis in the course of three maximum isomeric contractions performed before and after fulfillment of the given task – writing 10 texting messages, 160 symbols each, on the mobile phone in a specifically defined speed. The median of EMG signal frequency was selected as a parameter for evaluation of the start of muscular fatigue, while the frequency median values were compared before and after writing the texting messages. The decrease or increase of the frequency media was expressed in percentage. Furthermore the authors followed changes in the area under the curve of output spectrum of EMG signal. The results did not prove any start of muscular fatigue in either of the observed muscles in the course of texting writing on the mobile phone. On the contrary the results showed an increase of the frequency median values of EMG signal in m. opponens pollicis after fulfillment of the given task in four of the ficve subjects.
Key words:
polyelectromyography, Repetitive Strain Injury“ (RSI), „Text Message Injury“ (TMI), mobile phone, SMS texting, muscular fatigue
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Labels
Physiotherapist, university degree Rehabilitation Sports medicineArticle was published in
Rehabilitation and Physical Medicine
2011 Issue 2
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