Muscle functional connectivity during text entry using personal computers and smart - phones
نویسندگان
چکیده
The aim of this study was to assess the muscle functional connectivity obtained from surface electromyogram (SEMG) during unilateral and bilateral texting on a smart-phone as well as standard text entry on a personal computer. Fourteen healthy adults participated in the study. The SEMG signals from the left and right proximal: cervical erector spinae, upper trapezius, lower trapezius and distal muscles: extensor carpi radialis, extensor digitorum, flexor digitorum superficialis and, abductor pollicis brevis were recorded. The normalized mutual information (NMI) was computed between muscle pairs as an index indicating functional connectivity. The NMI was lower for text entry using a PC compared with either bilateral or unilateral texting on a smart-phone (P<0.001). Furthermore, the NMI values were higher for proximal muscles compared with distal homonymous muscle pairs (P<0.05). The changes in functional connectivity during bilateral or unilateral texting may not be favourable in the long run.
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