Research on Usability Evaluation and Redesign of Treadmill Man-Machine Interface Du Qin, Wan Tiantian (B ) , Zhang Xinrui, Dai Roujing, and Marcelo M. Soares School of Design, Hunan University, Hunan, People’s Republic of China 1119487321@qq.com, 893285247@qq.com, 1426710239@qq.com, 472304601@qq.com, soaresmm@gmail.com Abstract. The objective of this study was to propose a redesign solution to improve the user experience of the treadmill by evaluating the product usability. It was used the following methods: First, the human-machine interface between the user and the treadmill was evaluated using the subjective and objective mul- tidimensional usability assessment method. Among them, the objective usability assessment is based on behavioral indicators (task completion time, task success rate) for analysis; subjective usability assessment uses a questionnaire based on user subjective evaluation. Secondly, combined with the subjective and objec- tive evaluation of experimental results, the treadmill human-machine interface improvement suggestions are proposed and redesigned. Through the results of the experiment, we find that the human-machine interface of the treadmill has great problem with information management and button design. The interface contains too much information in each level and ranks in confusion. Besides, it shows low usage rate on certain buttons, which means a bad design on the usage flow. For a improvement, we select the features of the interface and redesign the interface by ranking the features by the users habits and importance of the features. We redesign the physical buttons into a touch screen but retain the position of each functional button. At the same time, we adjust the vibration feedback for users to reduce distracted from running. Keywords: Interactive interface · Usability assessment · Subjective evaluation · Objective evaluation · Redesign 1 Description With the improvement of living standards, people’s demand for health and fitness is increasing. In the vicinity of the university town, the number of gymnasiums has also exploded. As a standing fitness equipment in the gym, the treadmill is the first choice for indoor fitness. Using the treadmill can not only avoid unexpected situations that may occur during outdoor sports, but also ensure the safety of the user. The running strength can be adjusted according to the user’s wishes, and the physical condition can be feedback and monitored in time. However, as the treadmill continues to evolve, many complex functions have emerged. Although these functions meet the user’s additional needs in addition to running, they bring problems to the convenience of operation. In © Springer Nature Switzerland AG 2020 A. Marcus and E. Rosenzweig (Eds.): HCII 2020, LNCS 12202, pp. 342–350, 2020. https://doi.org/10.1007/978-3-030-49757-6_24