With two studies, we assess how different walking trajectories (straight line, circular, and infinity) and speeds (2 km/h, 4 km/h, and 6 km/h) influence the accuracy and response time of participants reading micro visualizations on a smartwatch. We showed our participants common watch face micro visualizations including date, time, weather information, and four complications showing progress charts of fitness data. Our findings suggest that while walking trajectories did not significantly affect reading performance, overall walking activity, especially at high speeds, hurt reading accuracy and, to some extent, response time. Supplemental material is available at: https://osf.io/u78s6/.

In this paper, we present three visualizations showing heart rate (HR) data collected over time. Two visualizations present a summary chart (bar or radial chart), summarizing the amount of time spent per HR zone (i.e., low, moderate, high intensity). We conducted a pilot study with five participants to evaluate the efficiency of the visualizations when monitoring the intensity of an activity while playing a tennis-like Virtual Reality game. Preliminary results show that participants were performing (with respect to time and accuracy) better with and preferred the bar chart summary.