en فیزیک درمانی Physiotherapy پژوهشي Original Research Articles <strong>Objectives</strong>: There exists no study concerning gait pattern while engaging in dual-task activities on different sizes of mobile devices. The present study aimed to compare gait patterns during normal walking, walking with smartphone use, and walking with tablet use.&nbsp;<br> <strong>Methods</strong>: Seventeen healthy female participants with an age range of 19-24 years (Mean&plusmn;SD age: 20.29&plusmn;1.61 years, weight: 49.82&plusmn;4.46 kg, height: 156.59&plusmn;4.87 cm, body mass index: 20.47&plusmn;0.84 kg/m2, and leg length: 81.35&plusmn;3.79 cm.) participated in the present research. The study subjects were requested to walk for 10 meters under the following conditions: normal walking; walking while typing a text message with a smartphone, and walking while typing a text message with a tablet. The Vicon&reg; Three-Dimensional (3D) motion analysis recorded the motion of reflective markers attached to the study participant&rsquo;s body. Gait parameters (step length, stride length, step time, stride time, step width, velocity, and cadence) were compared between the explored walking conditions.&nbsp;<br> <strong>Results</strong>: The gait parameter of normal walking, compared with walking during smartphone use as well as tablet use were significantly different in the gait pattern (P<0.05). Using either a smartphone or tablet during walking presented decreased step length for legs, gait velocity, and cadence. However, there was an increase in the right leg&rsquo;s step time and stride time. Moreover, there was no significant difference in gait patterns between walking during smartphone use and walking during tablet use (P>0.05).&nbsp;<br> <strong>Discussion</strong>: Changes in gait pattern during walking while typing a text message with either a smartphone or tablet may lead to greater attention and concentration required to type the message; such actions resulted in decreased gait speed and step length. Gait, Walking, Smartphone, Tablet, Smartphone, Tablet 475 484 http://irj.uswr.ac.ir/browse.php?a_code=A-10-1108-1&slc_lang=en&sid=1 Sirinthip Pakdee sirinthip.pa@wu.ac.th 0000-0003-3720-3752 No Department of Physical Therapy, School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat Province, Thailand. Praphatson Sengsoon praphatson.kl@wu.ac.th 0000-0003-0910-3455 Yes Department of Physical Therapy, School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat Province, Thailand.