Interaction with a smartphone under different task and environmental conditions: Emergence of users’ postural strategies

摘要: Abstract Nowadays, interactions with smartphones are constantly increasing. These devices used in a wide variety of situations by performing various tasks. The purpose this study is to determine whether one or more strategies emerge when subjects freely send message and browse on the web three environmental conditions: sitting without support standing. Therefore, hierarchical cluster analysis (HCA) was applied angular parameters neck trunk as well distance between face telephone. 3D motion data were also processed taking into account ergonomic recommendations from Rapid Upper Limb Assessment order qualify postural highlighted HCA. findings showed that there different adopted especially sagittal plane: first involves implying trunk; second strongly mobilizes flexion involving neck; third strategy which combines these two behaviors. depend condition. Indeed, associated presence while only appears conditions support. It observed smartphone users mainly adopt harmful postures, due excessive neck, both. Even place themselves least always risks musculoskeletal disorders short long term.