International Conference Publications

Effect of Smartphone Use on Upper Extremity and Neck

International Conference on Applied Human Factors and Ergonomics-2017

Abstract

Smartphones nowadays are very popular and does most of the work from sending emails to attending meetings. However, Smartphone over-use has been studied from years now and there are many proven problems such as neck pain, back pain, headache, arm or wrist pain, psychological discomfort, etc. In this study, effect of screen sizes, task type and one/two hand on user muscle activities was investigated while users perform various tasks on Smartphone. Electromyography was used to assess muscle activities. Results showed that screen size and one/two handed use had significant main effects on users’ muscle activity. Significant interaction effect was also found. For example, significantly less muscle activities were observed in hands while texting with two hands compared to one-hand. Gaming with two hands led to higher muscle activities on large screen Smartphone than small screen. The research could help users to choose more appropriate smart phones and develop a better usage habit.

Neck Flexion Angle and User Experience Compared on iPhone X and Samsung S8+

International Conference on Applied Human Factors and Ergonomics-2018

Abstract

There have been a lot of research and explanation on Smartphone screen size and user experience of numerous Smartphones. This study considers the difference between neck flexion angle and its effects on human ergonomics while using two Smartphones with different screen sizes and display features (iPhone X and Samsung S8+). This study also collects user experience data through a questionnaire to generate the most ergonomic model among the Apple Inc.’s iPhone X and Samsung S8+. 8 participants were considered for this study. A digital goniometer was used to analyze participant’s neck flexion angle while using both the Smartphones (iPhone X and Samsung S8+). A paired t-test of means was performed. Neck flexion angle was highly flexed for the participants while using iPhone X than compared to the neck flexion angle while using Samsung S8+. Participants felt more comfortable using both Smartphones. However, ‘True-tone’ technology in iPhone X eased the stress level of eyes according to the users. This study suggests a large screen smartphone with ‘True-tone’ or similar technology, which can be an iPhone X but with a larger screen size.

Master’s Thesis

A 200 page thesis focusing on Usability followed by enormous amount of lab experimentation, using world class equipment like electromyography and digital goniometer. Data was analyzed in SAS and exclusive results were presented. This study resulted into several international conference articles along with a journal which is under making.

The Effect of Smartphone Screen Size on Usability and Users’ Discomfort

Master’s Thesis, Lamar University, Texas